change quote to avoid escapes (#50368)

dev/benchmarks/microbenchmarks/lib/language/sync_star_semantics_bench.dart

@@ -11,7 +11,7 @@ const int _kNumWarmUp = 100;
 
 void main() {
   final List<String> words = 'Lorem Ipsum is simply dummy text of the printing and'
-    ' typesetting industry. Lorem Ipsum has been the industry\'s'
+    " typesetting industry. Lorem Ipsum has been the industry's"
     ' standard dummy text ever since the 1500s, when an unknown'
     ' printer took a galley of type and scrambled it to make a'
     ' type specimen book'.split(' ');

dev/bots/analyze.dart

@@ -330,7 +330,7 @@ Future<void> verifyNoTestPackageImports(String workingDirectory) async {
           assert(count > 0);
           if (count == 1)
             return null;
-          return '  $name: uses \'package:test\' $count times.';
+          return "  $name: uses 'package:test' $count times.";
         }
         if (name.startsWith('packages/flutter_test/')) {
           // flutter_test has deep ties to package:test
@@ -341,7 +341,7 @@ Future<void> verifyNoTestPackageImports(String workingDirectory) async {
           if (count == 1)
             return null;
         }
-        return '  $name: uses \'package:test\' directly';
+        return "  $name: uses 'package:test' directly";
       }
       return null;
     })
@@ -354,11 +354,11 @@ Future<void> verifyNoTestPackageImports(String workingDirectory) async {
     final String s1 = errors.length == 1 ? 's' : '';
     final String s2 = errors.length == 1 ? '' : 's';
     exitWithError(<String>[
-      '${bold}The following file$s2 use$s1 \'package:test\' incorrectly:$reset',
+      "${bold}The following file$s2 use$s1 'package:test' incorrectly:$reset",
       ...errors,
-      'Rather than depending on \'package:test\' directly, use one of the shims:',
+      "Rather than depending on 'package:test' directly, use one of the shims:",
       ...shims,
-      'This insulates us from breaking changes in \'package:test\'.'
+      "This insulates us from breaking changes in 'package:test'."
     ]);
   }
 }

dev/customer_testing/run_tests.dart

@@ -85,7 +85,7 @@ Future<bool> run(List<String> arguments) async {
       if (parsedArguments.rest.isEmpty) {
         print('Error: No file arguments specified.');
       } else if (files.isEmpty) {
-        print('Error: File arguments ("${parsedArguments.rest.join("\", \"")}") did not identify any real files.');
+        print('Error: File arguments ("${parsedArguments.rest.join('", "')}") did not identify any real files.');
       }
     }
     return help;

dev/devicelab/bin/run.dart

@@ -157,7 +157,7 @@ final ArgParser _argParser = ArgParser()
   ..addFlag(
     'list',
     abbr: 'l',
-    help: 'Don\'t actually run the tasks, but list out the tasks that would\n'
+    help: "Don't actually run the tasks, but list out the tasks that would\n"
           'have been run, in the order they would have run.',
   )
   ..addOption(

dev/devicelab/bin/tasks/gradle_migrate_settings_test.dart

@@ -53,7 +53,7 @@ Future<void> main() async {
         );
       });
 
-      const String newFileContent = 'include \':app\'';
+      const String newFileContent = "include ':app'";
 
       final File settingsGradle = File(path.join(projectDir.path, 'android', 'settings.gradle'));
       final File newSettingsGradle = File(path.join(projectDir.path, 'android', 'settings_aar.gradle'));

dev/devicelab/bin/tasks/gradle_non_android_plugin_test.dart

@@ -37,7 +37,7 @@ Future<void> main() async {
         );
       });
 
-      section('Delete plugin\'s Android folder');
+      section("Delete plugin's Android folder");
 
       final File androidFolder = File(path.join(
         projectDir.path,

dev/devicelab/bin/tasks/gradle_plugin_fat_apk_test.dart

@@ -127,7 +127,7 @@ Future<void> main() async {
 
           final String sharedLibrary = path.join(androidArmSnapshotPath, 'app.so');
           if (!File(sharedLibrary).existsSync()) {
-            throw TaskResult.failure('Shared library doesn\'t exist');
+            throw TaskResult.failure("Shared library doesn't exist");
           }
         }
       });

dev/devicelab/bin/tasks/module_test.dart

@@ -212,7 +212,7 @@ Future<void> main() async {
             android:name="flutterProjectType"
             android:value="module" />''')
       ) {
-        return TaskResult.failure('Debug host APK doesn\'t contain metadata: flutterProjectType = module ');
+        return TaskResult.failure("Debug host APK doesn't contain metadata: flutterProjectType = module ");
       }
 
       final String analyticsOutput = analyticsOutputFile.readAsStringSync();
@@ -270,7 +270,7 @@ Future<void> main() async {
             android:name="flutterProjectType"
             android:value="module" />''')
       ) {
-        return TaskResult.failure('Release host APK doesn\'t contain metadata: flutterProjectType = module ');
+        return TaskResult.failure("Release host APK doesn't contain metadata: flutterProjectType = module ");
       }
       return TaskResult.success(null);
     } on TaskResult catch (taskResult) {

dev/devicelab/bin/tasks/plugin_dependencies_test.dart

@@ -170,7 +170,7 @@ public class DummyPluginAClass {
           File(path.join(exampleApp.path, '.flutter-plugins-dependencies'));
 
       if (!flutterPluginsDependenciesFile.existsSync()) {
-        return TaskResult.failure('${flutterPluginsDependenciesFile.path} doesn\'t exist');
+        return TaskResult.failure("${flutterPluginsDependenciesFile.path} doesn't exist");
       }
 
       final String flutterPluginsDependenciesFileContent = flutterPluginsDependenciesFile.readAsStringSync();

dev/devicelab/bin/tasks/run_release_test.dart

@@ -78,8 +78,8 @@ void main() {
 
       _findNextMatcherInList(
         stdout,
-        (String line) => line.startsWith('Running Gradle task \'assembleRelease\'...'),
+        (String line) => line.startsWith("Running Gradle task 'assembleRelease'..."),
-        'Running Gradle task \'assembleRelease\'...',
+        "Running Gradle task 'assembleRelease'...",
       );
 
       _findNextMatcherInList(

dev/devicelab/lib/framework/adb.dart

@@ -225,7 +225,7 @@ class FuchsiaDeviceDiscovery implements DeviceDiscovery {
  String get _devFinder {
     final String devFinder = path.join(getArtifactPath(), 'fuchsia', 'tools', 'device-finder');
     if (!File(devFinder).existsSync()) {
-      throw FileSystemException('Couldn\'t find device-finder at location $devFinder');
+      throw FileSystemException("Couldn't find device-finder at location $devFinder");
     }
     return devFinder;
  }

dev/devicelab/lib/framework/apk_utils.dart

@@ -193,7 +193,7 @@ Future<void> checkApkContainsClasses(File apk, List<String> classes) async {
   final ApkExtractor extractor = ApkExtractor(apk);
   for (final String className in classes) {
     if (!(await extractor.containsClass(className))) {
-      throw Exception('APK doesn\'t contain class `$className`.');
+      throw Exception("APK doesn't contain class `$className`.");
     }
   }
   extractor.dispose();

dev/snippets/lib/main.dart

@@ -102,7 +102,7 @@ void main(List<String> argList) {
     _kShowDartPad,
     defaultsTo: false,
     negatable: false,
-    help: 'Indicates whether DartPad should be included in the sample\'s '
+    help: "Indicates whether DartPad should be included in the sample's "
         'final HTML output. This flag only applies when the type parameter is '
         '"sample".',
   );

dev/tools/dartdoc.dart

@@ -73,7 +73,7 @@ Future<void> main(List<String> arguments) async {
 
   final StringBuffer contents = StringBuffer('library temp_doc;\n\n');
   for (final String libraryRef in libraryRefs()) {
-    contents.writeln('import \'package:$libraryRef\';');
+    contents.writeln("import 'package:$libraryRef';");
   }
   File('$kDocsRoot/lib/temp_doc.dart').writeAsStringSync(contents.toString());
 

dev/tools/lib/roll_dev.dart

@@ -52,7 +52,7 @@ void main(List<String> args) {
     kJustPrint,
     negatable: false,
     help:
-        'Don\'t actually roll the dev channel; '
+        "Don't actually roll the dev channel; "
         'just print the would-be version and quit.',
   );
   argParser.addFlag(kYes, negatable: false, abbr: 'y', help: 'Skip the confirmation prompt.');

dev/tools/localization/bin/gen_l10n.dart

@@ -53,7 +53,7 @@ Future<void> main(List<String> arguments) async {
       'By default, the tool will generate the supported locales list in '
       'alphabetical order. Use this flag if you would like to default to '
       'a different locale. \n\n'
-      'For example, pass in [\'en_US\'] if you would like your app to '
+      "For example, pass in ['en_US'] if you would like your app to "
       'default to American English if a device supports it.',
   );
 

dev/tools/localization/gen_l10n.dart

@@ -126,7 +126,7 @@ const Set<String> numberFormatsWithNamedParameters = <String>{
 };
 
 List<String> generateIntlMethodArgs(Message message) {
-  final List<String> methodArgs = <String>['name: \'${message.resourceId}\''];
+  final List<String> methodArgs = <String>["name: '${message.resourceId}'"];
   if (message.description != null)
     methodArgs.add('desc: ${generateString(message.description)}');
   if (message.placeholders.isNotEmpty) {
@@ -159,7 +159,7 @@ String generateDateFormattingLogic(Message message) {
         'the "${placeholder.type}" type. To properly resolve for the right '
         '${placeholder.type} format, the "format" attribute needs to be set '
         'to determine which DateFormat to use. \n'
-        'Check the intl library\'s DateFormat class constructors for allowed '
+        "Check the intl library's DateFormat class constructors for allowed "
         'date formats.'
       );
     }
@@ -167,7 +167,7 @@ String generateDateFormattingLogic(Message message) {
       throw L10nException(
         'Date format "${placeholder.format}" for placeholder '
         '${placeholder.name} does not have a corresponding DateFormat '
-        'constructor\n. Check the intl library\'s DateFormat class '
+        "constructor\n. Check the intl library's DateFormat class "
         'constructors for allowed date formats.'
       );
     }
@@ -192,7 +192,7 @@ String generateNumberFormattingLogic(Message message) {
       throw L10nException(
         'Number format ${placeholder.format} for the ${placeholder.name} '
         'placeholder does not have a corresponding NumberFormat constructor.\n'
-        'Check the intl library\'s NumberFormat class constructors for allowed '
+        "Check the intl library's NumberFormat class constructors for allowed "
         'number formats.'
       );
     }
@@ -584,14 +584,14 @@ class LocalizationsGenerator {
     arbPathStrings.sort();
     localeInfoList.sort();
     supportedLanguageCodes.addAll(localeInfoList.map((LocaleInfo localeInfo) {
-      return '\'${localeInfo.languageCode}\'';
+      return "'${localeInfo.languageCode}'";
     }));
 
     if (preferredSupportedLocales != null) {
       for (final LocaleInfo preferredLocale in preferredSupportedLocales) {
         if (!localeInfoList.contains(preferredLocale)) {
           throw L10nException(
-            'The preferred supported locale, \'$preferredLocale\', cannot be '
+            "The preferred supported locale, '$preferredLocale', cannot be "
             'added. Please make sure that there is a corresponding arb file '
             'with translations for the locale, or remove the locale from the '
             'preferred supported locale list if there is no intent to support '
@@ -631,9 +631,9 @@ class LocalizationsGenerator {
       final String languageCode = locale.languageCode;
       final String countryCode = locale.countryCode;
 
-      resultingProperty += '\'$languageCode\'';
+      resultingProperty += "'$languageCode'";
       if (countryCode != null)
-        resultingProperty += ', \'$countryCode\'';
+        resultingProperty += ", '$countryCode'";
       resultingProperty += '),\n    Locale(';
     }
     resultingProperty = resultingProperty.substring(0, resultingProperty.length - '),\n    Locale('.length);

dev/tools/test/localization/gen_l10n_test.dart

@@ -518,7 +518,7 @@ void main() {
       expect(generator.supportedLocales.contains(LocaleInfo.fromString('am')), false);
     });
 
-    test('throws when arb file\'s locale could not be determined', () {
+    test("throws when arb file's locale could not be determined", () {
       fs.currentDirectory.childDirectory('lib').childDirectory('l10n')
         ..createSync(recursive: true)
         ..childFile('app.arb')

dev/tools/vitool/bin/main.dart

@@ -18,7 +18,7 @@ void main(List<String> args) {
       'help',
       abbr: 'h',
       negatable: false,
-      help: 'Display the tool\'s usage instructions and quit.',
+      help: "Display the tool's usage instructions and quit.",
   );
 
   parser.addOption(
@@ -36,7 +36,7 @@ void main(List<String> args) {
   parser.addOption(
       'part-of',
       abbr: 'p',
-      help: 'Library name to add a dart \'part of\' clause for.',
+      help: "Library name to add a dart 'part of' clause for.",
   );
 
   parser.addOption(

dev/tools/vitool/lib/vitool.dart

@@ -88,8 +88,8 @@ class PathAnimation {
         if (commandType != currentCommandType)
           throw Exception(
               'Paths must be built from the same commands in all frames '
-              'command $commandIdx at frame 0 was of type \'$commandType\' '
+              "command $commandIdx at frame 0 was of type '$commandType' "
-              'command $commandIdx at frame $i was of type \'$currentCommandType\''
+              "command $commandIdx at frame $i was of type '$currentCommandType'"
           );
         for (int j = 0; j < numPointsInCommand; j += 1)
           points[j].add(frame.paths[pathIdx].commands[commandIdx].points[j]);
@@ -529,7 +529,7 @@ final RegExp _pixelsExp = RegExp(r'^([0-9]+)px$');
 int parsePixels(String pixels) {
   if (!_pixelsExp.hasMatch(pixels))
     throw ArgumentError(
-      'illegal pixels expression: \'$pixels\''
+      "illegal pixels expression: '$pixels'"
       ' (the tool currently only support pixel units).');
   return int.parse(_pixelsExp.firstMatch(pixels).group(1));
 }
@@ -540,7 +540,7 @@ String _extractAttr(XmlElement element, String name) {
         .value;
   } catch (e) {
     throw ArgumentError(
-        'Can\'t find a single \'$name\' attributes in ${element.name}, '
+        "Can't find a single '$name' attributes in ${element.name}, "
         'attributes were: ${element.attributes}'
     );
   }

examples/flutter_gallery/lib/demo/cupertino/cupertino_alert_demo.dart

@@ -141,7 +141,7 @@ class _CupertinoAlertDemoState extends State<CupertinoAlertDemo> {
           'for directions, nearby search results, and estimated travel times.'),
         actions: <Widget>[
           CupertinoDialogAction(
-            child: const Text('Don\'t Allow'),
+            child: const Text("Don't Allow"),
             onPressed: () => Navigator.pop(context, 'Disallow'),
           ),
           CupertinoDialogAction(

examples/flutter_gallery/lib/demo/material/buttons_demo.dart

@@ -25,7 +25,7 @@ const String _outlineText =
 const String _outlineCode = 'buttons_outline';
 
 const String _dropdownText =
-    'A dropdown button displays a menu that\'s used to select a value from a '
+    "A dropdown button displays a menu that's used to select a value from a "
     'small set of values. The button displays the current value and a down '
     'arrow.';
 
@@ -33,7 +33,7 @@ const String _dropdownCode = 'buttons_dropdown';
 
 const String _iconText =
     'IconButtons are appropriate for toggle buttons that allow a single choice '
-    'to be selected or deselected, such as adding or removing an item\'s star.';
+    "to be selected or deselected, such as adding or removing an item's star.";
 
 const String _iconCode = 'buttons_icon';
 

examples/flutter_gallery/lib/demo/material/dialog_demo.dart

@@ -124,7 +124,7 @@ class DialogDemoState extends State<DialogDemo> {
               showDemoDialog<DialogDemoAction>(
                 context: context,
                 child: AlertDialog(
-                  title: const Text('Use Google\'s location service?'),
+                  title: const Text("Use Google's location service?"),
                   content: Text(
                     _alertWithTitleText,
                     style: dialogTextStyle,

examples/flutter_gallery/lib/demo/material/selection_controls_demo.dart

@@ -8,7 +8,7 @@ import '../../gallery/demo.dart';
 
 const String _checkboxText =
   'Checkboxes allow the user to select multiple options from a set. '
-  'A normal checkbox\'s value is true or false and a tristate checkbox\'s '
+  "A normal checkbox's value is true or false and a tristate checkbox's "
   'value can also be null.';
 
 const String _checkboxCode = 'selectioncontrols_checkbox';

examples/flutter_gallery/lib/demo/material/snack_bar_demo.dart

@@ -50,7 +50,7 @@ class _SnackBarDemoState extends State<SnackBarDemo> {
                     label: 'ACTION',
                     onPressed: () {
                       Scaffold.of(context).showSnackBar(SnackBar(
-                        content: Text('You pressed snackbar $thisSnackBarIndex\'s action.'),
+                        content: Text("You pressed snackbar $thisSnackBarIndex's action."),
                       ));
                     },
                   ),

examples/flutter_gallery/lib/demo/material/text_form_field_demo.dart

@@ -108,7 +108,7 @@ class TextFormFieldDemoState extends State<TextFormFieldDemo> {
       showInSnackBar('Please fix the errors in red before submitting.');
     } else {
       form.save();
-      showInSnackBar('${person.name}\'s phone number is ${person.phoneNumber}');
+      showInSnackBar("${person.name}'s phone number is ${person.phoneNumber}");
     }
   }
 
@@ -136,7 +136,7 @@ class TextFormFieldDemoState extends State<TextFormFieldDemo> {
     if (passwordField.value == null || passwordField.value.isEmpty)
       return 'Please enter a password.';
     if (passwordField.value != value)
-      return 'The passwords don\'t match';
+      return "The passwords don't match";
     return null;
   }
 

examples/flutter_gallery/lib/demo/pesto_demo.dart

@@ -610,7 +610,7 @@ const List<Recipe> kPestoRecipes = <Recipe>[
     author: 'Ali Connors',
     ingredientsImagePath: 'food/icons/main.png',
     ingredientsImagePackage: _kGalleryAssetsPackage,
-    description: 'With this pesto recipe, you can quickly whip up a meal to satisfy your savory needs. And if you\'re feeling festive, you can add bacon to taste.',
+    description: "With this pesto recipe, you can quickly whip up a meal to satisfy your savory needs. And if you're feeling festive, you can add bacon to taste.",
     imagePath: 'food/pesto_pasta.png',
     imagePackage: _kGalleryAssetsPackage,
     ingredients: <RecipeIngredient>[
@@ -634,7 +634,7 @@ const List<Recipe> kPestoRecipes = <Recipe>[
     author: 'Sandra Adams',
     ingredientsImagePath: 'food/icons/main.png',
     ingredientsImagePackage: _kGalleryAssetsPackage,
-    description: 'Sometimes when you\'re craving some cheer in your life you can jumpstart your day with some cherry pie. Dessert for breakfast is perfectly acceptable.',
+    description: "Sometimes when you're craving some cheer in your life you can jumpstart your day with some cherry pie. Dessert for breakfast is perfectly acceptable.",
     imagePath: 'food/cherry_pie.png',
     imagePackage: _kGalleryAssetsPackage,
     ingredients: <RecipeIngredient>[
@@ -654,7 +654,7 @@ const List<Recipe> kPestoRecipes = <Recipe>[
     author: 'Peter Carlsson',
     ingredientsImagePath: 'food/icons/spicy.png',
     ingredientsImagePackage: _kGalleryAssetsPackage,
-    description: 'Everyone\'s favorite leafy green is back. Paired with fresh sliced onion, it\'s ready to tackle any dish, whether it be a salad or an egg scramble.',
+    description: "Everyone's favorite leafy green is back. Paired with fresh sliced onion, it's ready to tackle any dish, whether it be a salad or an egg scramble.",
     imagePath: 'food/spinach_onion_salad.png',
     imagePackage: _kGalleryAssetsPackage,
     ingredients: <RecipeIngredient>[
@@ -694,7 +694,7 @@ const List<Recipe> kPestoRecipes = <Recipe>[
     author: 'Trevor Hansen',
     ingredientsImagePath: 'food/icons/quick.png',
     ingredientsImagePackage: _kGalleryAssetsPackage,
-    description: 'You \'feta\' believe this is a crowd-pleaser! Flaky phyllo pastry surrounds a delicious mixture of spinach and cheeses to create the perfect appetizer.',
+    description: "You 'feta' believe this is a crowd-pleaser! Flaky phyllo pastry surrounds a delicious mixture of spinach and cheeses to create the perfect appetizer.",
     imagePath: 'food/spanakopita.png',
     imagePackage: _kGalleryAssetsPackage,
     ingredients: <RecipeIngredient>[

examples/flutter_gallery/lib/gallery/demo.dart

@@ -77,7 +77,7 @@ class TabbedComponentDemoScaffold extends StatelessWidget {
         context: context,
         builder: (BuildContext context) {
           return SimpleDialog(
-            title: const Text('Couldn\'t display URL:'),
+            title: const Text("Couldn't display URL:"),
             children: <Widget>[
               Padding(
                 padding: const EdgeInsets.symmetric(horizontal: 16.0),

packages/flutter/lib/src/cupertino/text_field.dart

@@ -285,7 +285,7 @@ class CupertinoTextField extends StatefulWidget {
        assert(minLines == null || minLines > 0),
        assert(
          (maxLines == null) || (minLines == null) || (maxLines >= minLines),
-         'minLines can\'t be greater than maxLines',
+         "minLines can't be greater than maxLines",
        ),
        assert(expands != null),
        assert(

packages/flutter/lib/src/foundation/key.dart

@@ -82,7 +82,7 @@ class ValueKey<T> extends LocalKey {
 
   @override
   String toString() {
-    final String valueString = T == String ? '<\'$value\'>' : '<$value>';
+    final String valueString = T == String ? "<'$value'>" : '<$value>';
     // The crazy on the next line is a workaround for
     // https://github.com/dart-lang/sdk/issues/33297
     if (runtimeType == _TypeLiteral<ValueKey<T>>().type)

packages/flutter/lib/src/material/debug.dart

@@ -31,7 +31,7 @@ bool debugCheckHasMaterial(BuildContext context) {
           '${context.widget.runtimeType} widgets require a Material '
           'widget ancestor.\n'
           'In material design, most widgets are conceptually "printed" on '
-          'a sheet of material. In Flutter\'s material library, that '
+          "a sheet of material. In Flutter's material library, that "
           'material is represented by the Material widget. It is the '
           'Material widget that renders ink splashes, for instance. '
           'Because of this, many material library widgets require that '

packages/flutter/lib/src/material/dropdown.dart

@@ -804,7 +804,7 @@ class DropdownButton<T> extends StatefulWidget {
               items.where((DropdownMenuItem<T> item) {
                 return item.value == value;
               }).length == 1,
-                'There should be exactly one item with [DropdownButton]\'s value: '
+                "There should be exactly one item with [DropdownButton]'s value: "
                 '$value. \n'
                 'Either zero or 2 or more [DropdownMenuItem]s were detected '
                 'with the same value',
@@ -1420,7 +1420,7 @@ class DropdownButtonFormField<T> extends FormField<T> {
               items.where((DropdownMenuItem<T> item) {
                 return item.value == value;
               }).length == 1,
-                'There should be exactly one item with [DropdownButton]\'s value: '
+                "There should be exactly one item with [DropdownButton]'s value: "
                 '$value. \n'
                 'Either zero or 2 or more [DropdownMenuItem]s were detected '
                 'with the same value',

packages/flutter/lib/src/material/expansion_panel.dart

@@ -37,8 +37,8 @@ class _SaltedKey<S, V> extends LocalKey {
 
   @override
   String toString() {
-    final String saltString = S == String ? '<\'$salt\'>' : '<$salt>';
+    final String saltString = S == String ? "<'$salt'>" : '<$salt>';
-    final String valueString = V == String ? '<\'$value\'>' : '<$value>';
+    final String valueString = V == String ? "<'$value'>" : '<$value>';
     return '[$saltString $valueString]';
   }
 }

packages/flutter/lib/src/material/list_tile.dart

@@ -265,7 +265,7 @@ enum ListTileControlAffinity {
 /// // ...
 /// ListTile(
 ///   leading: const Icon(Icons.flight_land),
-///   title: const Text('Trix\'s airplane'),
+///   title: const Text("Trix's airplane"),
 ///   subtitle: _act != 2 ? const Text('The airplane is only in Act II.') : null,
 ///   enabled: _act == 2,
 ///   onTap: () { /* react to the tile being tapped */ }

packages/flutter/lib/src/material/tabs.dart

@@ -1001,8 +1001,8 @@ class _TabBarState extends State<TabBar> {
     assert(() {
       if (_controller.length != widget.tabs.length) {
         throw FlutterError(
-          'Controller\'s length property (${_controller.length}) does not match the '
+          "Controller's length property (${_controller.length}) does not match the "
-          'number of tabs (${widget.tabs.length}) present in TabBar\'s tabs property.'
+          "number of tabs (${widget.tabs.length}) present in TabBar's tabs property."
         );
       }
       return true;
@@ -1326,8 +1326,8 @@ class _TabBarViewState extends State<TabBarView> {
     assert(() {
       if (_controller.length != widget.children.length) {
         throw FlutterError(
-          'Controller\'s length property (${_controller.length}) does not match the '
+          "Controller's length property (${_controller.length}) does not match the "
-          'number of tabs (${widget.children.length}) present in TabBar\'s tabs property.'
+          "number of tabs (${widget.children.length}) present in TabBar's tabs property."
         );
       }
       return true;

packages/flutter/lib/src/material/text_field.dart

@@ -358,7 +358,7 @@ class TextField extends StatefulWidget {
        assert(minLines == null || minLines > 0),
        assert(
          (maxLines == null) || (minLines == null) || (maxLines >= minLines),
-         'minLines can\'t be greater than maxLines',
+         "minLines can't be greater than maxLines",
        ),
        assert(expands != null),
        assert(

packages/flutter/lib/src/material/text_form_field.dart

@@ -139,7 +139,7 @@ class TextFormField extends FormField<String> {
        assert(minLines == null || minLines > 0),
        assert(
          (maxLines == null) || (minLines == null) || (maxLines >= minLines),
-         'minLines can\'t be greater than maxLines',
+         "minLines can't be greater than maxLines",
        ),
        assert(expands != null),
        assert(

packages/flutter/lib/src/painting/box_decoration.dart

@@ -97,7 +97,7 @@ class BoxDecoration extends Decoration {
   }) : assert(shape != null),
        assert(
          backgroundBlendMode == null || color != null || gradient != null,
-         'backgroundBlendMode applies to BoxDecoration\'s background color or '
+         "backgroundBlendMode applies to BoxDecoration's background color or "
          'gradient, but no color or gradient was provided.'
        );
 

packages/flutter/lib/src/painting/text_style.dart

@@ -50,7 +50,7 @@ const String _kColorBackgroundWarning = 'Cannot provide both a backgroundColor a
 ///
 /// ```dart
 /// Text(
-///   'Welcome to the present, we\'re running a real nation.',
+///   "Welcome to the present, we're running a real nation.",
 ///   style: TextStyle(fontStyle: FontStyle.italic),
 /// )
 /// ```
@@ -80,15 +80,15 @@ const String _kColorBackgroundWarning = 'Cannot provide both a backgroundColor a
 ///     style: DefaultTextStyle.of(context).style,
 ///     children: <TextSpan>[
 ///       TextSpan(
-///         text: 'You don\'t have the votes.\n',
+///         text: "You don't have the votes.\n",
 ///         style: TextStyle(color: Colors.black.withOpacity(0.6)),
 ///       ),
 ///       TextSpan(
-///         text: 'You don\'t have the votes!\n',
+///         text: "You don't have the votes!\n",
 ///         style: TextStyle(color: Colors.black.withOpacity(0.8)),
 ///       ),
 ///       TextSpan(
-///         text: 'You\'re gonna need congressional approval and you don\'t have the votes!\n',
+///         text: "You're gonna need congressional approval and you don't have the votes!\n",
 ///         style: TextStyle(color: Colors.black.withOpacity(1.0)),
 ///       ),
 ///     ],
@@ -106,7 +106,7 @@ const String _kColorBackgroundWarning = 'Cannot provide both a backgroundColor a
 ///
 /// ```dart
 /// Text(
-///   'These are wise words, enterprising men quote \'em.',
+///   "These are wise words, enterprising men quote 'em.",
 ///   style: DefaultTextStyle.of(context).style.apply(fontSizeFactor: 2.0),
 /// )
 /// ```
@@ -158,7 +158,7 @@ const String _kColorBackgroundWarning = 'Cannot provide both a backgroundColor a
 /// ```dart
 /// RichText(
 ///   text: TextSpan(
-///     text: 'Don\'t tax the South ',
+///     text: "Don't tax the South ",
 ///     children: <TextSpan>[
 ///       TextSpan(
 ///         text: 'cuz',

packages/flutter/lib/src/rendering/box.dart

@@ -1800,7 +1800,7 @@ abstract class RenderBox extends RenderObject {
           }
           if (!value._canBeUsedByParent) {
             throw FlutterError.fromParts(<DiagnosticsNode>[
-              ErrorSummary('A child\'s size was used without setting parentUsesSize.'),
+              ErrorSummary("A child's size was used without setting parentUsesSize."),
               describeForError('The following render object'),
               value._owner.describeForError('...was assigned a size obtained from its child'),
               ErrorDescription(
@@ -2110,14 +2110,14 @@ abstract class RenderBox extends RenderObject {
             ErrorSummary('Cannot hit test a render box that has never been laid out.'),
             describeForError('The hitTest() method was called on this RenderBox'),
             ErrorDescription(
-              'Unfortunately, this object\'s geometry is not known at this time, '
+              "Unfortunately, this object's geometry is not known at this time, "
               'probably because it has never been laid out. '
               'This means it cannot be accurately hit-tested.'
             ),
             ErrorHint(
               'If you are trying '
               'to perform a hit test during the layout phase itself, make sure '
-              'you only hit test nodes that have completed layout (e.g. the node\'s '
+              "you only hit test nodes that have completed layout (e.g. the node's "
               'children, after their layout() method has been called).'
             ),
           ]);

packages/flutter/lib/src/rendering/editable.dart

@@ -221,7 +221,7 @@ class RenderEditable extends RenderBox with RelayoutWhenSystemFontsChangeMixin {
        assert(endHandleLayerLink != null),
        assert(
          (maxLines == null) || (minLines == null) || (maxLines >= minLines),
-         'minLines can\'t be greater than maxLines',
+         "minLines can't be greater than maxLines",
        ),
        assert(expands != null),
        assert(

packages/flutter/lib/src/rendering/flex.dart

@@ -711,7 +711,7 @@ class RenderFlex extends RenderBox with ContainerRenderObjectMixin<RenderBox, Fl
             DiagnosticsProperty<dynamic>('The creator information is set to', debugCreator, style: DiagnosticsTreeStyle.errorProperty),
             ...addendum,
             ErrorDescription(
-              'If none of the above helps enough to fix this problem, please don\'t hesitate to file a bug:\n'
+              "If none of the above helps enough to fix this problem, please don't hesitate to file a bug:\n"
               '  https://github.com/flutter/flutter/issues/new?template=BUG.md'
             ),
           ]);

packages/flutter/lib/src/rendering/layer.dart

@@ -134,7 +134,7 @@ abstract class Layer extends AbstractNode with DiagnosticableTreeMixin {
     assert(
       !alwaysNeedsAddToScene,
       '$runtimeType with alwaysNeedsAddToScene set called markNeedsAddToScene.\n'
-      'The layer\'s alwaysNeedsAddToScene is set to true, and therefore it should not call markNeedsAddToScene.',
+      "The layer's alwaysNeedsAddToScene is set to true, and therefore it should not call markNeedsAddToScene.",
     );
 
     // Already marked. Short-circuit.

packages/flutter/lib/src/rendering/list_body.dart

@@ -104,7 +104,7 @@ class RenderListBody extends RenderBox
       throw FlutterError.fromParts(<DiagnosticsNode>[
         ErrorSummary('RenderListBody must have a bounded constraint for its cross axis.'),
         ErrorDescription(
-          'RenderListBody forces its children to expand to fit the RenderListBody\'s container, '
+          "RenderListBody forces its children to expand to fit the RenderListBody's container, "
           'so it must be placed in a parent that constrains the cross '
           'axis to a finite dimension.'
         ),

packages/flutter/lib/src/rendering/object.dart

@@ -1683,7 +1683,7 @@ abstract class RenderObject extends AbstractNode with DiagnosticableTreeMixin im
           final String problemFunction = (targetFrameMatch != null && targetFrameMatch.groupCount > 0) ? targetFrameMatch.group(1) : stack[targetFrame].trim();
           // TODO(jacobr): this case is similar to displaying a single stack frame.
           yield ErrorDescription(
-            'These invalid constraints were provided to $runtimeType\'s layout() '
+            "These invalid constraints were provided to $runtimeType's layout() "
             'function by the following function, which probably computed the '
             'invalid constraints in question:\n'
             '  $problemFunction'

packages/flutter/lib/src/rendering/proxy_box.dart

@@ -466,7 +466,7 @@ class RenderAspectRatio extends RenderProxyBox {
           ErrorDescription(
             'This $runtimeType was given an aspect ratio of $aspectRatio but was given '
             'both unbounded width and unbounded height constraints. Because both '
-            'constraints were unbounded, this render object doesn\'t know how much '
+            "constraints were unbounded, this render object doesn't know how much "
             'size to consume.'
           )
         ]);

packages/flutter/lib/src/rendering/sliver.dart

@@ -745,7 +745,7 @@ class SliverGeometry extends Diagnosticable {
           'The "maxPaintExtent" is less than the "paintExtent".',
           details:
             _debugCompareFloats('maxPaintExtent', maxPaintExtent, 'paintExtent', paintExtent)
-              ..add(ErrorDescription('By definition, a sliver can\'t paint more than the maximum that it can paint!')),
+              ..add(ErrorDescription("By definition, a sliver can't paint more than the maximum that it can paint!")),
         );
       }
       verify(hitTestExtent != null, 'The "hitTestExtent" is null.');

packages/flutter/lib/src/semantics/semantics.dart

@@ -1361,7 +1361,7 @@ class SemanticsNode extends AbstractNode with DiagnosticableTreeMixin {
         final List<DiagnosticsNode> mutationErrors = <DiagnosticsNode>[];
         if (newChildren.length != _debugPreviousSnapshot.length) {
           mutationErrors.add(ErrorDescription(
-            'The list\'s length has changed from ${_debugPreviousSnapshot.length} '
+            "The list's length has changed from ${_debugPreviousSnapshot.length} "
             'to ${newChildren.length}.'
           ));
         } else {

packages/flutter/lib/src/services/binary_messenger.dart

@@ -76,13 +76,13 @@ BinaryMessenger get defaultBinaryMessenger {
       throw FlutterError(
         'ServicesBinding.defaultBinaryMessenger was accessed before the '
         'binding was initialized.\n'
-        'If you\'re running an application and need to access the binary '
+        "If you're running an application and need to access the binary "
         'messenger before `runApp()` has been called (for example, during '
         'plugin initialization), then you need to explicitly call the '
         '`WidgetsFlutterBinding.ensureInitialized()` first.\n'
-        'If you\'re running a test, you can call the '
+        "If you're running a test, you can call the "
         '`TestWidgetsFlutterBinding.ensureInitialized()` as the first line in '
-        'your test\'s `main()` method to initialize the binding.'
+        "your test's `main()` method to initialize the binding."
       );
     }
     return true;

packages/flutter/lib/src/services/platform_views.dart

@@ -65,7 +65,7 @@ class PlatformViewsService {
         }
         break;
       default:
-        throw UnimplementedError('${call.method} was invoked but isn\'t implemented by PlatformViewsService');
+        throw UnimplementedError("${call.method} was invoked but isn't implemented by PlatformViewsService");
     }
     return null;
   }

packages/flutter/lib/src/widgets/actions.dart

@@ -329,7 +329,7 @@ class Actions extends InheritedWidget {
       }
       if (action == null) {
         throw FlutterError('Unable to find an action for an intent in the $Actions widget in the context.\n'
-            '$Actions.invoke() was called on an $Actions widget that doesn\'t '
+            "$Actions.invoke() was called on an $Actions widget that doesn't "
             'contain a mapping for the given intent.\n'
             'The context used was:\n'
             '  $context\n'

packages/flutter/lib/src/widgets/app.dart

@@ -1250,7 +1250,7 @@ class _WidgetsAppState extends State<WidgetsApp> with WidgetsBindingObserver {
       final StringBuffer message = StringBuffer();
       message.writeln('\u2550' * 8);
       message.writeln(
-        'Warning: This application\'s locale, $appLocale, is not supported by all of its\n'
+        "Warning: This application's locale, $appLocale, is not supported by all of its\n"
         'localization delegates.'
       );
       for (final Type unsupportedType in unsupportedTypes) {
@@ -1265,7 +1265,7 @@ class _WidgetsAppState extends State<WidgetsApp> with WidgetsBindingObserver {
       }
       message.writeln(
         'See https://flutter.dev/tutorials/internationalization/ for more\n'
-        'information about configuring an app\'s locale, supportedLocales,\n'
+        "information about configuring an app's locale, supportedLocales,\n"
         'and localizationsDelegates parameters.'
       );
       message.writeln('\u2550' * 8);

packages/flutter/lib/src/widgets/basic.dart

@@ -144,7 +144,7 @@ class Directionality extends InheritedWidget {
 /// ```dart
 /// Opacity(
 ///   opacity: _visible ? 1.0 : 0.0,
-///   child: const Text('Now you see me, now you don\'t!'),
+///   child: const Text("Now you see me, now you don't!"),
 /// )
 /// ```
 /// {@end-tool}
@@ -4029,7 +4029,7 @@ class Flex extends MultiChildRenderObjectWidget {
 /// Row(
 ///   children: <Widget>[
 ///     const FlutterLogo(),
-///     const Text('Flutter\'s hot reload helps you quickly and easily experiment, build UIs, add features, and fix bug faster. Experience sub-second reload times, without losing state, on emulators, simulators, and hardware for iOS and Android.'),
+///     const Text("Flutter's hot reload helps you quickly and easily experiment, build UIs, add features, and fix bug faster. Experience sub-second reload times, without losing state, on emulators, simulators, and hardware for iOS and Android."),
 ///     const Icon(Icons.sentiment_very_satisfied),
 ///   ],
 /// )
@@ -4057,7 +4057,7 @@ class Flex extends MultiChildRenderObjectWidget {
 ///   children: <Widget>[
 ///     const FlutterLogo(),
 ///     const Expanded(
-///       child: Text('Flutter\'s hot reload helps you quickly and easily experiment, build UIs, add features, and fix bug faster. Experience sub-second reload times, without losing state, on emulators, simulators, and hardware for iOS and Android.'),
+///       child: Text("Flutter's hot reload helps you quickly and easily experiment, build UIs, add features, and fix bug faster. Experience sub-second reload times, without losing state, on emulators, simulators, and hardware for iOS and Android."),
 ///     ),
 ///     const Icon(Icons.sentiment_very_satisfied),
 ///   ],

packages/flutter/lib/src/widgets/editable_text.dart

@@ -426,7 +426,7 @@ class EditableText extends StatefulWidget {
        assert(minLines == null || minLines > 0),
        assert(
          (maxLines == null) || (minLines == null) || (maxLines >= minLines),
-         'minLines can\'t be greater than maxLines',
+         "minLines can't be greater than maxLines",
        ),
        assert(expands != null),
        assert(

packages/flutter/lib/src/widgets/framework.dart

@@ -1222,7 +1222,7 @@ abstract class State<T extends StatefulWidget> extends Diagnosticable {
           ErrorSummary('setState() called in constructor: $this'),
           ErrorHint(
             'This happens when you call setState() on a State object for a widget that '
-            'hasn\'t been inserted into the widget tree yet. It is not necessary to call '
+            "hasn't been inserted into the widget tree yet. It is not necessary to call "
             'setState() in the constructor, since the state is already assumed to be dirty '
             'when it is initially created.'
           ),
@@ -3104,7 +3104,7 @@ abstract class Element extends DiagnosticableTree implements BuildContext {
       throw FlutterError.fromParts(<DiagnosticsNode>[
         ErrorSummary('visitChildElements() called during build.'),
         ErrorDescription(
-          'The BuildContext.visitChildElements() method can\'t be called during '
+          "The BuildContext.visitChildElements() method can't be called during "
           'build because the child list is still being updated at that point, '
           'so the children might not be constructed yet, or might be old children '
           'that are going to be replaced.'
@@ -3368,7 +3368,7 @@ abstract class Element extends DiagnosticableTree implements BuildContext {
       assert(() {
         if (parent == this) {
           throw FlutterError.fromParts(<DiagnosticsNode>[
-            ErrorSummary('A GlobalKey was used multiple times inside one widget\'s child list.'),
+            ErrorSummary("A GlobalKey was used multiple times inside one widget's child list."),
             DiagnosticsProperty<GlobalKey>('The offending GlobalKey was', key),
             parent.describeElement('The parent of the widgets with that key was'),
             element.describeElement('The first child to get instantiated with that key became'),
@@ -3763,15 +3763,15 @@ abstract class Element extends DiagnosticableTree implements BuildContext {
     assert(() {
       if (_debugLifecycleState != _ElementLifecycle.active) {
         throw FlutterError.fromParts(<DiagnosticsNode>[
-          ErrorSummary('Looking up a deactivated widget\'s ancestor is unsafe.'),
+          ErrorSummary("Looking up a deactivated widget's ancestor is unsafe."),
           ErrorDescription(
-            'At this point the state of the widget\'s element tree is no longer '
+            "At this point the state of the widget's element tree is no longer "
             'stable.'
           ),
           ErrorHint(
-            'To safely refer to a widget\'s ancestor in its dispose() method, '
+            "To safely refer to a widget's ancestor in its dispose() method, "
             'save a reference to the ancestor by calling dependOnInheritedWidgetOfExactType() '
-            'in the widget\'s didChangeDependencies() method.'
+            "in the widget's didChangeDependencies() method."
           ),
         ]);
       }
@@ -4733,7 +4733,7 @@ class StatefulElement extends ComponentElement {
           ErrorSummary('dependOnInheritedWidgetOfExactType<$targetType>() or dependOnInheritedElement() was called before ${_state.runtimeType}.initState() completed.'),
           ErrorDescription(
             'When an inherited widget changes, for example if the value of Theme.of() changes, '
-            'its dependent widgets are rebuilt. If the dependent widget\'s reference to '
+            "its dependent widgets are rebuilt. If the dependent widget's reference to "
             'the inherited widget is in a constructor or an initState() method, '
             'then the rebuilt dependent widget will not reflect the changes in the '
             'inherited widget.',

packages/flutter/lib/src/widgets/scroll_view.dart

@@ -796,7 +796,7 @@ abstract class BoxScrollView extends ScrollView {
 ///   shrinkWrap: true,
 ///   padding: const EdgeInsets.all(20.0),
 ///   children: <Widget>[
-///     const Text('I\'m dedicating every day to you'),
+///     const Text("I'm dedicating every day to you"),
 ///     const Text('Domestic life was never quite my style'),
 ///     const Text('When you smile, you knock me out, I fall apart'),
 ///     const Text('And I thought I was so smart'),
@@ -815,7 +815,7 @@ abstract class BoxScrollView extends ScrollView {
 ///       sliver: SliverList(
 ///         delegate: SliverChildListDelegate(
 ///           <Widget>[
-///             const Text('I\'m dedicating every day to you'),
+///             const Text("I'm dedicating every day to you"),
 ///             const Text('Domestic life was never quite my style'),
 ///             const Text('When you smile, you knock me out, I fall apart'),
 ///             const Text('And I thought I was so smart'),
@@ -1307,7 +1307,7 @@ class ListView extends BoxScrollView {
 ///   children: <Widget>[
 ///     Container(
 ///       padding: const EdgeInsets.all(8),
-///       child: const Text('He\'d have you all unravel at the'),
+///       child: const Text("He'd have you all unravel at the"),
 ///       color: Colors.teal[100],
 ///     ),
 ///     Container(
@@ -1359,7 +1359,7 @@ class ListView extends BoxScrollView {
 ///         children: <Widget>[
 ///           Container(
 ///             padding: const EdgeInsets.all(8),
-///             child: const Text('He\'d have you all unravel at the'),
+///             child: const Text("He'd have you all unravel at the"),
 ///             color: Colors.green[100],
 ///           ),
 ///           Container(

packages/flutter/lib/src/widgets/sliver.dart

@@ -1335,7 +1335,7 @@ class SliverMultiBoxAdaptorElement extends RenderObjectElement implements Render
 /// bool _visible = true;
 /// List<Widget> listItems = <Widget>[
 ///   Text('Now you see me,'),
-///   Text('Now you don\'t!'),
+///   Text("Now you don't!"),
 /// ];
 ///
 /// SliverOpacity(

packages/flutter/test/cupertino/button_test.dart

@@ -156,7 +156,7 @@ void main() {
     expect(SchedulerBinding.instance.transientCallbackCount, equals(1));
   });
 
-  testWidgets('Disabled button doesn\'t animate', (WidgetTester tester) async {
+  testWidgets("Disabled button doesn't animate", (WidgetTester tester) async {
     await tester.pumpWidget(boilerplate(child: const CupertinoButton(
       child: Text('Tap me'),
       onPressed: null,

packages/flutter/test/cupertino/context_menu_test.dart

@@ -208,7 +208,7 @@ void main() {
       expect(_findStatic(), findsNothing);
     }, skip: isBrowser); // https://github.com/flutter/flutter/issues/44152
 
-    testWidgets('Backdrop is added using ModalRoute\'s filter parameter', (WidgetTester tester) async {
+    testWidgets("Backdrop is added using ModalRoute's filter parameter", (WidgetTester tester) async {
       final Widget child = _getChild();
       await tester.pumpWidget(_getContextMenu(child: child));
       expect(find.byType(BackdropFilter), findsNothing);
@@ -224,7 +224,7 @@ void main() {
     }, skip: isBrowser); // https://github.com/flutter/flutter/issues/44152
   });
 
-  group('Open layout differs depending on child\'s position on screen', () {
+  group("Open layout differs depending on child's position on screen", () {
     testWidgets('Portrait', (WidgetTester tester) async {
       const Size portraitScreenSize = Size(600.0, 800.0);
       await binding.setSurfaceSize(portraitScreenSize);

packages/flutter/test/foundation/error_reporting_test.dart

@@ -163,7 +163,7 @@ Future<void> main() async {
     FlutterError.dumpErrorToConsole(FlutterErrorDetails(
       exception: getAssertionErrorWithoutMessage(),
     ));
-    expect(console.join('\n'), matches('Another exception was thrown: \'[^\']+flutter/test/foundation/error_reporting_test\\.dart\': Failed assertion: line [0-9]+ pos [0-9]+: \'false\': is not true\\.'));
+    expect(console.join('\n'), matches("Another exception was thrown: '[^']+flutter/test/foundation/error_reporting_test\\.dart': Failed assertion: line [0-9]+ pos [0-9]+: 'false': is not true\\."));
     console.clear();
     FlutterError.resetErrorCount();
   });

packages/flutter/test/material/app_builder_test.dart

@@ -6,7 +6,7 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter/material.dart';
 
 void main() {
-  testWidgets('builder doesn\'t get called if app doesn\'t change', (WidgetTester tester) async {
+  testWidgets("builder doesn't get called if app doesn't change", (WidgetTester tester) async {
     final List<String> log = <String>[];
     final Widget app = MaterialApp(
       theme: ThemeData(
@@ -37,7 +37,7 @@ void main() {
     expect(log, <String>['build']);
   });
 
-  testWidgets('builder doesn\'t get called if app doesn\'t change', (WidgetTester tester) async {
+  testWidgets("builder doesn't get called if app doesn't change", (WidgetTester tester) async {
     final List<String> log = <String>[];
     await tester.pumpWidget(
       MaterialApp(

packages/flutter/test/material/bottom_sheet_theme_test.dart

@@ -194,7 +194,7 @@ void main() {
     expect(material.color, persistentBackgroundColor);
   });
 
-  testWidgets('Modal bottom sheet-specific parameters don\'t apply to persistent bottom sheets', (WidgetTester tester) async {
+  testWidgets("Modal bottom sheet-specific parameters don't apply to persistent bottom sheets", (WidgetTester tester) async {
     const double modalElevation = 5.0;
     const Color modalBackgroundColor = Colors.yellow;
     const BottomSheetThemeData bottomSheetTheme = BottomSheetThemeData(

packages/flutter/test/material/debug_test.dart

@@ -29,7 +29,7 @@ void main() {
       '   No Material widget found.\n'
       '   ListTile widgets require a Material widget ancestor.\n'
       '   In material design, most widgets are conceptually "printed" on a\n'
-      '   sheet of material. In Flutter\'s material library, that material\n'
+      "   sheet of material. In Flutter's material library, that material\n"
       '   is represented by the Material widget. It is the Material widget\n'
       '   that renders ink splashes, for instance. Because of this, many\n'
       '   material library widgets require that there be a Material widget\n'

packages/flutter/test/material/dropdown_form_field_test.dart

@@ -590,7 +590,7 @@ void main() {
     } on AssertionError catch (error) {
       expect(
         error.toString(),
-        contains('There should be exactly one item with [DropdownButton]\'s value'),
+        contains("There should be exactly one item with [DropdownButton]'s value"),
       );
     }
   });
@@ -621,7 +621,7 @@ void main() {
     } on AssertionError catch (error) {
       expect(
         error.toString(),
-        contains('There should be exactly one item with [DropdownButton]\'s value'),
+        contains("There should be exactly one item with [DropdownButton]'s value"),
       );
     }
   });

packages/flutter/test/material/dropdown_test.dart

@@ -324,7 +324,7 @@ void main() {
     } on AssertionError catch (error) {
       expect(
         error.toString(),
-        contains('There should be exactly one item with [DropdownButton]\'s value'),
+        contains("There should be exactly one item with [DropdownButton]'s value"),
       );
     }
   });
@@ -355,7 +355,7 @@ void main() {
     } on AssertionError catch (error) {
       expect(
         error.toString(),
-        contains('There should be exactly one item with [DropdownButton]\'s value'),
+        contains("There should be exactly one item with [DropdownButton]'s value"),
       );
     }
   });

packages/flutter/test/material/material_button_test.dart

@@ -213,7 +213,7 @@ void main() {
     await gesture2.up();
   });
 
-  testWidgets('MaterialButton\'s disabledColor takes precedence over its default disabled color.', (WidgetTester tester) async {
+  testWidgets("MaterialButton's disabledColor takes precedence over its default disabled color.", (WidgetTester tester) async {
     // Regression test for https://github.com/flutter/flutter/issues/30012.
 
     final Finder rawButtonMaterial = find.descendant(

packages/flutter/test/material/outline_button_test.dart

@@ -616,7 +616,7 @@ void main() {
     expect(tester.widget<OutlineButton>(outlineButton).enabled, false);
   });
 
-  testWidgets('Outline button doesn\'t crash if disabled during a gesture', (WidgetTester tester) async {
+  testWidgets("Outline button doesn't crash if disabled during a gesture", (WidgetTester tester) async {
     Widget buildFrame(VoidCallback onPressed) {
       return Directionality(
         textDirection: TextDirection.ltr,

packages/flutter/test/material/scrollbar_test.dart

@@ -36,7 +36,7 @@ Widget _buildBoilerplate({
 }
 
 void main() {
-  testWidgets('Scrollbar doesn\'t show when tapping list', (WidgetTester tester) async {
+  testWidgets("Scrollbar doesn't show when tapping list", (WidgetTester tester) async {
     await tester.pumpWidget(
       _buildBoilerplate(
         child: Center(

packages/flutter/test/material/slider_theme_test.dart

@@ -80,15 +80,15 @@ void main() {
       'disabledThumbColor: Color(0xff000011)',
       'overlayColor: Color(0xff000012)',
       'valueIndicatorColor: Color(0xff000013)',
-      'overlayShape: Instance of \'RoundSliderOverlayShape\'',
+      "overlayShape: Instance of 'RoundSliderOverlayShape'",
-      'tickMarkShape: Instance of \'RoundSliderTickMarkShape\'',
+      "tickMarkShape: Instance of 'RoundSliderTickMarkShape'",
-      'thumbShape: Instance of \'RoundSliderThumbShape\'',
+      "thumbShape: Instance of 'RoundSliderThumbShape'",
-      'trackShape: Instance of \'RoundedRectSliderTrackShape\'',
+      "trackShape: Instance of 'RoundedRectSliderTrackShape'",
-      'valueIndicatorShape: Instance of \'PaddleSliderValueIndicatorShape\'',
+      "valueIndicatorShape: Instance of 'PaddleSliderValueIndicatorShape'",
-      'rangeTickMarkShape: Instance of \'RoundRangeSliderTickMarkShape\'',
+      "rangeTickMarkShape: Instance of 'RoundRangeSliderTickMarkShape'",
-      'rangeThumbShape: Instance of \'RoundRangeSliderThumbShape\'',
+      "rangeThumbShape: Instance of 'RoundRangeSliderThumbShape'",
-      'rangeTrackShape: Instance of \'RoundedRectRangeSliderTrackShape\'',
+      "rangeTrackShape: Instance of 'RoundedRectRangeSliderTrackShape'",
-      'rangeValueIndicatorShape: Instance of \'PaddleRangeSliderValueIndicatorShape\'',
+      "rangeValueIndicatorShape: Instance of 'PaddleRangeSliderValueIndicatorShape'",
       'showValueIndicator: always',
       'valueIndicatorTextStyle: TextStyle(inherit: true, color: Color(0xff000000))',
     ]);

packages/flutter/test/material/tabs_test.dart

@@ -2409,7 +2409,7 @@ void main() {
                 ),
                 body: tabTextContent.isNotEmpty
                   ? TabBarView(
-                      children: tabTextContent.map((String textContent) => Tab(text: '$textContent\'s view')).toList()
+                      children: tabTextContent.map((String textContent) => Tab(text: "$textContent's view")).toList()
                     )
                   : const Center(child: Text('No tabs')),
                 bottomNavigationBar: BottomAppBar(
@@ -2452,7 +2452,7 @@ void main() {
     await tester.tap(find.byKey(const Key('Add tab')));
     await tester.pumpAndSettle();
     expect(find.text('Tab 1'), findsOneWidget);
-    expect(find.text('Tab 1\'s view'), findsOneWidget);
+    expect(find.text("Tab 1's view"), findsOneWidget);
 
     // Dynamically updates to zero tabs properly
     await tester.tap(find.byKey(const Key('Delete tab')));

packages/flutter/test/material/text_field_test.dart

@@ -139,7 +139,7 @@ void main() {
     'Third line of stuff';
   const String kMoreThanFourLines =
     kThreeLines +
-    '\nFourth line won\'t display and ends at';
+    "\nFourth line won't display and ends at";
 
   // Returns the first RenderEditable.
   RenderEditable findRenderEditable(WidgetTester tester) {
@@ -914,7 +914,7 @@ void main() {
     expect(controller.selection.baseOffset, testValue.indexOf('h'));
   });
 
-  testWidgets('Slight movements in longpress don\'t hide/show handles', (WidgetTester tester) async {
+  testWidgets("Slight movements in longpress don't hide/show handles", (WidgetTester tester) async {
     final TextEditingController controller = TextEditingController();
 
     await tester.pumpWidget(
@@ -2322,7 +2322,7 @@ void main() {
     }
 
     const String hintPlaceholder = 'Placeholder';
-    const String multipleLineText = 'Here\'s a text, which is more than one line, to demostrate the multiple line hint text';
+    const String multipleLineText = "Here's a text, which is more than one line, to demostrate the multiple line hint text";
     await tester.pumpWidget(builder(null, hintPlaceholder));
 
     RenderBox findHintText(String hint) => tester.renderObject(find.text(hint));
@@ -7367,7 +7367,7 @@ void main() {
       expect(renderBox.size.height, greaterThanOrEqualTo(kMinInteractiveDimension));
     });
 
-    testWidgets('When text is very small, TextField still doesn\'t go below kMinInteractiveDimension height', (WidgetTester tester) async {
+    testWidgets("When text is very small, TextField still doesn't go below kMinInteractiveDimension height", (WidgetTester tester) async {
       await tester.pumpWidget(MaterialApp(
         theme: ThemeData(),
         home: const Scaffold(

packages/flutter/test/painting/border_side_test.dart

@@ -121,7 +121,7 @@ void main() {
     expect(paint2.color, const Color(0x00000000));
     expect(paint2.blendMode, BlendMode.srcOver);
   });
-  test('BorderSide - won\'t lerp into negative widths', () {
+  test("BorderSide - won't lerp into negative widths", () {
     const BorderSide side0 = BorderSide(width: 0.0);
     const BorderSide side1 = BorderSide(width: 1.0);
     const BorderSide side2 = BorderSide(width: 2.0);

packages/flutter/test/painting/image_cache_test.dart

@@ -199,7 +199,7 @@ void main() {
       expect(resultingCompleter2, completer2);
     });
 
-    test('failed image can successfully be removed from the cache\'s pending images', () async {
+    test("failed image can successfully be removed from the cache's pending images", () async {
       const TestImage testImage = TestImage(width: 8, height: 8);
 
       const FailingTestImageProvider(1, 1, image: testImage)

packages/flutter/test/painting/notched_shapes_test.dart

@@ -9,7 +9,7 @@ import 'package:flutter/painting.dart';
 
 void main() {
   group('CircularNotchedRectangle', () {
-    test('guest and host don\'t overlap', () {
+    test("guest and host don't overlap", () {
       const CircularNotchedRectangle shape = CircularNotchedRectangle();
       const Rect host = Rect.fromLTRB(0.0, 100.0, 300.0, 300.0);
       const Rect guest = Rect.fromLTWH(50.0, 50.0, 10.0, 10.0);

packages/flutter/test/rendering/aspect_ratio_test.dart

@@ -121,7 +121,7 @@ void main() {
       '   This RenderAspectRatio was given an aspect ratio of 0.5 but was\n'
       '   given both unbounded width and unbounded height constraints.\n'
       '   Because both constraints were unbounded, this render object\n'
-      '   doesn\'t know how much size to consume.\n'
+      "   doesn't know how much size to consume.\n"
     );
     // The second error message is a generic message generated by the Dart VM. Not worth testing.
   });

packages/flutter/test/rendering/box_test.dart

@@ -941,12 +941,12 @@ void main() {
             '     constraints: MISSING\n'
             '     size: MISSING\n'
             '     additionalConstraints: BoxConstraints(0.0<=w<=Infinity, h=100.0)\n'
-            '   Unfortunately, this object\'s geometry is not known at this time,\n'
+            "   Unfortunately, this object's geometry is not known at this time,\n"
             '   probably because it has never been laid out. This means it cannot\n'
             '   be accurately hit-tested.\n'
             '   If you are trying to perform a hit test during the layout phase\n'
             '   itself, make sure you only hit test nodes that have completed\n'
-            '   layout (e.g. the node\'s children, after their layout() method has\n'
+            "   layout (e.g. the node's children, after their layout() method has\n"
             '   been called).\n'
           ),
         );
@@ -954,7 +954,7 @@ void main() {
           result.diagnostics.singleWhere((DiagnosticsNode node) => node.level == DiagnosticLevel.hint).toString(),
           'If you are trying to perform a hit test during the layout phase '
           'itself, make sure you only hit test nodes that have completed '
-          'layout (e.g. the node\'s children, after their layout() method has '
+          "layout (e.g. the node's children, after their layout() method has "
           'been called).',
         );
       }

packages/flutter/test/rendering/layer_annotations_test.dart

@@ -89,7 +89,7 @@ void main() {
     );
   });
 
-  test('ContainerLayer.findAllAnnotations returns children\'s opacity (true)', () {
+  test("ContainerLayer.findAllAnnotations returns children's opacity (true)", () {
     final Layer root = _withBackgroundAnnotation(1000,
       _Layers(
         ContainerLayer(),
@@ -107,7 +107,7 @@ void main() {
     );
   });
 
-  test('ContainerLayer.findAllAnnotations returns children\'s opacity (false)', () {
+  test("ContainerLayer.findAllAnnotations returns children's opacity (false)", () {
     final Layer root = _withBackgroundAnnotation(1000,
       _Layers(
         ContainerLayer(),
@@ -574,7 +574,7 @@ void main() {
   });
 
   test('AnnotatedRegionLayer.findAllAnnotations should still check children and return '
-    'children\'s opacity (false) during a failed hit', () {
+    "children's opacity (false) during a failed hit", () {
     const Offset position = Offset(5, 5);
 
     final Layer root = _withBackgroundAnnotation(1000,
@@ -596,7 +596,7 @@ void main() {
   });
 
   test('AnnotatedRegionLayer.findAllAnnotations should still check children and return '
-    'children\'s opacity (true) during a failed hit', () {
+    "children's opacity (true) during a failed hit", () {
     const Offset position = Offset(5, 5);
 
     final Layer root = _withBackgroundAnnotation(1000,
@@ -616,7 +616,7 @@ void main() {
     );
   });
 
-  test('AnnotatedRegionLayer.findAllAnnotations should not add to children\'s opacity '
+  test("AnnotatedRegionLayer.findAllAnnotations should not add to children's opacity "
     'during a successful hit if it is not opaque', () {
     const Offset position = Offset(5, 5);
 
@@ -639,7 +639,7 @@ void main() {
     );
   });
 
-  test('AnnotatedRegionLayer.findAllAnnotations should add to children\'s opacity '
+  test("AnnotatedRegionLayer.findAllAnnotations should add to children's opacity "
     'during a successful hit if it is opaque', () {
     const Offset position = Offset(5, 5);
 

packages/flutter/test/rendering/paragraph_test.dart

@@ -12,7 +12,7 @@ import 'package:flutter_test/flutter_test.dart';
 
 import 'rendering_tester.dart';
 
-const String _kText = 'I polished up that handle so carefullee\nThat now I am the Ruler of the Queen\'s Navee!';
+const String _kText = "I polished up that handle so carefullee\nThat now I am the Ruler of the Queen's Navee!";
 
 void main() {
   test('getOffsetForCaret control test', () {
@@ -88,7 +88,7 @@ void main() {
     expect(range50.textInside(_kText), equals(' '));
 
     final TextRange range85 = paragraph.getWordBoundary(const TextPosition(offset: 75));
-    expect(range85.textInside(_kText), equals('Queen\'s'));
+    expect(range85.textInside(_kText), equals("Queen's"));
   }, skip: isBrowser);
 
   test('overflow test', () {
@@ -170,7 +170,7 @@ void main() {
   test('maxLines', () {
     final RenderParagraph paragraph = RenderParagraph(
       const TextSpan(
-        text: 'How do you write like you\'re running out of time? Write day and night like you\'re running out of time?',
+        text: "How do you write like you're running out of time? Write day and night like you're running out of time?",
             // 0123456789 0123456789 012 345 0123456 012345 01234 012345678 012345678 0123 012 345 0123456 012345 01234
             // 0          1          2       3       4      5     6         7         8    9       10      11     12
         style: TextStyle(fontFamily: 'Ahem', fontSize: 10.0),

packages/flutter/test/semantics/semantics_test.dart

@@ -102,7 +102,7 @@ void main() {
           'Failed to replace child semantics nodes because the list of `SemanticsNode`s was mutated.\n'
           'Instead of mutating the existing list, create a new list containing the desired `SemanticsNode`s.\n'
           'Error details:\n'
-          'The list\'s length has changed from 1 to 2.'
+          "The list's length has changed from 1 to 2."
         ));
         expect(
           error.diagnostics.singleWhere((DiagnosticsNode node) => node.level == DiagnosticLevel.hint).toString(),

packages/flutter/test/services/platform_views_test.dart

@@ -128,7 +128,7 @@ void main() {
 
     });
 
-    test('change Android view\'s directionality before creation', () async {
+    test("change Android view's directionality before creation", () async {
       viewsController.registerViewType('webview');
       final AndroidViewController viewController =
       PlatformViewsService.initAndroidView(id: 0, viewType: 'webview', layoutDirection: TextDirection.rtl);
@@ -141,7 +141,7 @@ void main() {
           ]));
     });
 
-    test('change Android view\'s directionality after creation', () async {
+    test("change Android view's directionality after creation", () async {
       viewsController.registerViewType('webview');
       final AndroidViewController viewController =
       PlatformViewsService.initAndroidView(id: 0, viewType: 'webview', layoutDirection: TextDirection.ltr);

packages/flutter/test/widgets/actions_test.dart

@@ -343,7 +343,7 @@ void main() {
         .map((DiagnosticsNode node) => node.toString())
         .toList();
 
-      expect(description, equals(<String>['key: [<\'foo\'>]']));
+      expect(description, equals(<String>["key: [<'foo'>]"]));
     });
     testWidgets('CallbackAction debugFillProperties', (WidgetTester tester) async {
       final DiagnosticPropertiesBuilder builder = DiagnosticPropertiesBuilder();
@@ -360,7 +360,7 @@ void main() {
           .map((DiagnosticsNode node) => node.toString())
           .toList();
 
-      expect(description, equals(<String>['intentKey: [<\'foo\'>]']));
+      expect(description, equals(<String>["intentKey: [<'foo'>]"]));
     });
     testWidgets('default Actions debugFillProperties', (WidgetTester tester) async {
       final DiagnosticPropertiesBuilder builder = DiagnosticPropertiesBuilder();
@@ -401,7 +401,7 @@ void main() {
           .toList();
 
       expect(description[0], equalsIgnoringHashCodes('dispatcher: ActionDispatcher#00000'));
-      expect(description[1], equals('actions: {[<\'bar\'>]: Closure: () => TestAction}'));
+      expect(description[1], equals("actions: {[<'bar'>]: Closure: () => TestAction}"));
     }, skip: isBrowser);
   });
 }

packages/flutter/test/widgets/backdrop_filter_test.dart

@@ -9,7 +9,7 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter/material.dart';
 
 void main() {
-  testWidgets('BackdropFilter\'s cull rect does not shrink', (WidgetTester tester) async {
+  testWidgets("BackdropFilter's cull rect does not shrink", (WidgetTester tester) async {
     tester.binding.addTime(const Duration(seconds: 15));
     await tester.pumpWidget(
       MaterialApp(

packages/flutter/test/widgets/basic_test.dart

@@ -309,7 +309,7 @@ class DoesNotHitRenderBox extends Matcher {
 
   @override
   Description describe(Description description) =>
-    description.add('hit test result doesn\'t contain ').addDescriptionOf(renderBox);
+    description.add("hit test result doesn't contain ").addDescriptionOf(renderBox);
 
   @override
   bool matches(dynamic item, Map<dynamic, dynamic> matchState) {

packages/flutter/test/widgets/custom_paint_test.dart

@@ -162,7 +162,7 @@ void main() {
     expect(error.toStringDeep(), equalsIgnoringHashCodes(
       'FlutterError\n'
       '   Failed to update the list of CustomPainterSemantics:\n'
-      '   - duplicate key [<\'0\'>] found at position 1\n'
+      "   - duplicate key [<'0'>] found at position 1\n"
     ));
   });
 

packages/flutter/test/widgets/debug_test.dart

@@ -33,7 +33,7 @@ void main() {
           '   must have unique keys.\n'
           '   Flex(direction: vertical, mainAxisAlignment: start,\n'
           '   crossAxisAlignment: center) has multiple children with key\n'
-          '   [<\'key\'>].\n',
+          "   [<'key'>].\n",
         ),
       );
     }
@@ -56,7 +56,7 @@ void main() {
         error.toStringDeep(),
         equalsIgnoringHashCodes(
           'FlutterError\n'
-          '   Duplicate key found: [<\'key\'>].\n'
+          "   Duplicate key found: [<'key'>].\n"
         ),
       );
     }
@@ -206,7 +206,7 @@ void main() {
           '   A build function returned context.widget.\n'
           '   The offending widget is:\n'
           '     Container\n'
-          '   Build functions must never return their BuildContext parameter\'s\n'
+          "   Build functions must never return their BuildContext parameter's\n"
           '   widget or a child that contains "context.widget". Doing so\n'
           '   introduces a loop in the widget tree that can cause the app to\n'
           '   crash.\n'

packages/flutter/test/widgets/directionality_test.dart

@@ -63,7 +63,7 @@ void main() {
     expect(good, isTrue);
   });
 
-  testWidgets('Directionality can\'t be null', (WidgetTester tester) async {
+  testWidgets("Directionality can't be null", (WidgetTester tester) async {
     expect(() {
       Directionality(textDirection: nonconst(null), child: const Placeholder());
     }, throwsAssertionError);

packages/flutter/test/widgets/editable_text_test.dart

@@ -3043,7 +3043,7 @@ void main() {
             );
             break;
           default:
-            throw TestFailure('HandlePositionInViewport can\'t be null.');
+            throw TestFailure("HandlePositionInViewport can't be null.");
         }
       }
       expect(state.selectionOverlay.handlesAreVisible, isTrue);
@@ -3923,7 +3923,7 @@ void main() {
             );
             break;
           default:
-            throw TestFailure('HandlePositionInViewport can\'t be null.');
+            throw TestFailure("HandlePositionInViewport can't be null.");
         }
       }
       expect(state.selectionOverlay.handlesAreVisible, isTrue);
@@ -3969,7 +3969,7 @@ void main() {
     await verifyVisibility(HandlePositionInViewport.rightEdge, false, HandlePositionInViewport.rightEdge, false);
   }, skip: isBrowser, variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.iOS,  TargetPlatform.macOS }));
 
-  testWidgets('scrolling doesn\'t bounce', (WidgetTester tester) async {
+  testWidgets("scrolling doesn't bounce", (WidgetTester tester) async {
     // 3 lines of text, where the last line overflows and requires scrolling.
     const String testText = 'XXXXX\nXXXXX\nXXXXX';
     final TextEditingController controller = TextEditingController(text: testText);

packages/flutter/test/widgets/fade_in_image_test.dart

@@ -251,7 +251,7 @@ Future<void> main() async {
       expect(findFadeInImage(tester).target.opacity, moreOrLessEquals(1));
     });
 
-    testWidgets('doesn\'t interrupt in-progress animation when animation values are updated', (WidgetTester tester) async {
+    testWidgets("doesn't interrupt in-progress animation when animation values are updated", (WidgetTester tester) async {
       final TestImageProvider placeholderProvider = TestImageProvider(placeholderImage);
       final TestImageProvider imageProvider = TestImageProvider(targetImage);
 

packages/flutter/test/widgets/flex_test.dart

@@ -73,7 +73,7 @@ void main() {
     );
   });
 
-  testWidgets('Doesn\'t overflow because of floating point accumulated error', (WidgetTester tester) async {
+  testWidgets("Doesn't overflow because of floating point accumulated error", (WidgetTester tester) async {
     // both of these cases have failed in the past due to floating point issues
     await tester.pumpWidget(
       Center(

packages/flutter/test/widgets/gesture_detector_semantics_test.dart

@@ -174,7 +174,7 @@ void main() {
     semantics.dispose();
   });
 
-  group('RawGestureDetector\'s custom semantics delegate', () {
+  group("RawGestureDetector's custom semantics delegate", () {
     testWidgets('should update semantics notations when switching from the default delegate', (WidgetTester tester) async {
       final SemanticsTester semantics = SemanticsTester(tester);
       final Map<Type, GestureRecognizerFactory> gestures =
@@ -322,7 +322,7 @@ void main() {
     });
   });
 
-  group('RawGestureDetector\'s default semantics delegate', () {
+  group("RawGestureDetector's default semantics delegate", () {
     group('should map onTap to', () {
       testWidgets('null when there is no TapGR', (WidgetTester tester) async {
         final SemanticsTester semantics = SemanticsTester(tester);

packages/flutter/test/widgets/gesture_detector_test.dart

@@ -91,7 +91,7 @@ void main() {
     await tester.pumpWidget(Container());
   });
 
-  testWidgets('Pan doesn\'t crash', (WidgetTester tester) async {
+  testWidgets("Pan doesn't crash", (WidgetTester tester) async {
     bool didStartPan = false;
     Offset panDelta;
     bool didEndPan = false;
@@ -523,7 +523,7 @@ void main() {
     expect(forcePressStart, 0);
   });
 
-  group('RawGestureDetectorState\'s debugFillProperties', () {
+  group("RawGestureDetectorState's debugFillProperties", () {
     testWidgets('when default', (WidgetTester tester) async {
       final DiagnosticPropertiesBuilder builder = DiagnosticPropertiesBuilder();
       final GlobalKey key = GlobalKey();

packages/flutter/test/widgets/global_keys_duplicated_test.dart

@@ -53,7 +53,7 @@ void main() {
     expect(error.toString(), startsWith('Multiple widgets used the same GlobalKey.\n'));
     expect(error.toString(), isNot(contains('different widgets that both had the following description')));
     expect(error.toString(), contains('Container'));
-    expect(error.toString(), contains('Container-[<\'x\'>]'));
+    expect(error.toString(), contains("Container-[<'x'>]"));
     expect(error.toString(), contains('[GlobalObjectKey ${describeIdentity(0)}]'));
     expect(error.toString(), endsWith('\nA GlobalKey can only be specified on one widget at a time in the widget tree.'));
   });

packages/flutter/test/widgets/icon_test.dart

@@ -166,7 +166,7 @@ void main() {
     semantics.dispose();
   });
 
-  testWidgets('Changing semantic label from null doesn\'t rebuild tree ', (WidgetTester tester) async {
+  testWidgets("Changing semantic label from null doesn't rebuild tree ", (WidgetTester tester) async {
     await tester.pumpWidget(
       const Directionality(
         textDirection: TextDirection.ltr,

packages/flutter/test/widgets/image_test.dart

@@ -64,7 +64,7 @@ void main() {
     expect(renderImage.image, isNull);
   });
 
-  testWidgets('Verify Image doesn\'t reset its RenderImage when changing providers if it has gaplessPlayback set', (WidgetTester tester) async {
+  testWidgets("Verify Image doesn't reset its RenderImage when changing providers if it has gaplessPlayback set", (WidgetTester tester) async {
     final GlobalKey key = GlobalKey();
     final TestImageProvider imageProvider1 = TestImageProvider();
     await tester.pumpWidget(
@@ -144,7 +144,7 @@ void main() {
     expect(renderImage.image, isNull);
   });
 
-  testWidgets('Verify Image doesn\'t reset its RenderImage when changing providers if it has gaplessPlayback set', (WidgetTester tester) async {
+  testWidgets("Verify Image doesn't reset its RenderImage when changing providers if it has gaplessPlayback set", (WidgetTester tester) async {
     final GlobalKey key = GlobalKey();
     final TestImageProvider imageProvider1 = TestImageProvider();
     await tester.pumpWidget(
@@ -1199,7 +1199,7 @@ void main() {
     expect(find.byType(RawImage), findsOneWidget);
   }, skip: isBrowser);
 
-  testWidgets('Image doesn\'t rebuild on chunk events if loadingBuilder is null', (WidgetTester tester) async {
+  testWidgets("Image doesn't rebuild on chunk events if loadingBuilder is null", (WidgetTester tester) async {
     final ui.Image image = await tester.runAsync(createTestImage);
     final TestImageStreamCompleter streamCompleter = TestImageStreamCompleter();
     final TestImageProvider imageProvider = TestImageProvider(streamCompleter: streamCompleter);

packages/flutter/test/widgets/inherited_test.dart

@@ -408,7 +408,7 @@ void main() {
     expect(inheritedValue, equals(3));
   });
 
-  testWidgets('Inherited widget doesn\'t notify descendants when descendant did not previously fail to find a match and had no dependencies', (WidgetTester tester) async {
+  testWidgets("Inherited widget doesn't notify descendants when descendant did not previously fail to find a match and had no dependencies", (WidgetTester tester) async {
     int buildCount = 0;
 
     final Widget inner = Container(

packages/flutter/test/widgets/list_body_test.dart

@@ -185,7 +185,7 @@ void main() {
       'FlutterError\n'
       '   RenderListBody must have a bounded constraint for its cross axis.\n'
       '   RenderListBody forces its children to expand to fit the\n'
-      '   RenderListBody\'s container, so it must be placed in a parent that\n'
+      "   RenderListBody's container, so it must be placed in a parent that\n"
       '   constrains the cross axis to a finite dimension.\n'
       '   If you are attempting to nest a RenderListBody with one direction\n'
       '   inside one of another direction, you will want to wrap the inner\n'

packages/flutter/test/widgets/list_view_fling_test.dart

@@ -9,7 +9,7 @@ const double kHeight = 10.0;
 const double kFlingOffset = kHeight * 20.0;
 
 void main() {
-  testWidgets('Flings don\'t stutter', (WidgetTester tester) async {
+  testWidgets("Flings don't stutter", (WidgetTester tester) async {
     await tester.pumpWidget(
       Directionality(
         textDirection: TextDirection.ltr,

packages/flutter/test/widgets/listener_test.dart

@@ -354,7 +354,7 @@ void main() {
     });
   });
 
-  testWidgets('RenderPointerListener\'s debugFillProperties when default', (WidgetTester tester) async {
+  testWidgets("RenderPointerListener's debugFillProperties when default", (WidgetTester tester) async {
     final DiagnosticPropertiesBuilder builder = DiagnosticPropertiesBuilder();
     RenderPointerListener().debugFillProperties(builder);
 
@@ -372,7 +372,7 @@ void main() {
     ]);
   });
 
-  testWidgets('RenderPointerListener\'s debugFillProperties when full', (WidgetTester tester) async {
+  testWidgets("RenderPointerListener's debugFillProperties when full", (WidgetTester tester) async {
     final DiagnosticPropertiesBuilder builder = DiagnosticPropertiesBuilder();
     RenderPointerListener(
       onPointerDown: (PointerDownEvent event) {},

packages/flutter/test/widgets/overscroll_indicator_test.dart

@@ -162,7 +162,7 @@ void main() {
     expect(painter, doesNotOverscroll);
   });
 
-  group('Flipping direction of scrollable doesn\'t change overscroll behavior', () {
+  group("Flipping direction of scrollable doesn't change overscroll behavior", () {
     testWidgets('down', (WidgetTester tester) async {
       await tester.pumpWidget(
         const Directionality(

packages/flutter/test/widgets/page_transitions_test.dart

@@ -198,7 +198,7 @@ void main() {
     expect(settingsOffset.dy, 100.0);
   }, variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.iOS,  TargetPlatform.macOS }));
 
-  testWidgets('Check back gesture doesn\'t start during transitions', (WidgetTester tester) async {
+  testWidgets("Check back gesture doesn't start during transitions", (WidgetTester tester) async {
     final GlobalKey containerKey1 = GlobalKey();
     final GlobalKey containerKey2 = GlobalKey();
     final Map<String, WidgetBuilder> routes = <String, WidgetBuilder>{