Fix tests to prepare for --explicit-package-dependencies and a bug. (#162289)

@camsim99 discovered these would fail here:
https://github.com/flutter/flutter/pull/161826#issuecomment-2617059566.

This fixes in preparation for the flag flipping, and also fixes a bug in
resolving `synthetic-package` I missed (it _can't_ be true if
`--explicit-package-dependencies` is set).

packages/flutter_tools/lib/src/commands/generate_localizations.dart

@@ -151,7 +151,7 @@ class GenerateLocalizationsCommand extends FlutterCommand {
     );
     argParser.addFlag(
       'synthetic-package',
-      defaultsTo: true,
+      defaultsTo: !featureFlags.isExplicitPackageDependenciesEnabled,
       help:
           'Determines whether or not the generated output files will be '
           'generated as a synthetic package or at a specified directory in '
@@ -159,12 +159,8 @@ class GenerateLocalizationsCommand extends FlutterCommand {
           '\n'
           'DEPRECATED: https://flutter.dev/to/flutter-gen-deprecation.\n'
           '\n'
-          'This flag is set to true by default.\n'
-          '\n'
           'When synthetic-package is set to false, it will generate the '
-          'localizations files in the directory specified by arb-dir by default.\n'
+          'localizations files in the directory specified by arb-dir by default.\n',
-          '\n'
-          'If output-dir is specified, files will be generated there.',
     );
     argParser.addOption(
       'project-dir',

packages/flutter_tools/lib/src/localizations/localizations_utils.dart

@@ -353,7 +353,7 @@ class LocalizationOptions {
        outputLocalizationFile = outputLocalizationFile ?? 'app_localizations.dart',
        outputClass = outputClass ?? 'AppLocalizations',
        useDeferredLoading = useDeferredLoading ?? false,
-       syntheticPackage = syntheticPackage ?? true,
+       syntheticPackage = syntheticPackage ?? !featureFlags.isExplicitPackageDependenciesEnabled,
        requiredResourceAttributes = requiredResourceAttributes ?? false,
        nullableGetter = nullableGetter ?? true,
        format = format ?? false,

packages/flutter_tools/test/commands.shard/hermetic/generate_localizations_test.dart

@@ -65,14 +65,13 @@ void main() {
       );
       await createTestCommandRunner(command).run(<String>['gen-l10n']);
 
-      final Directory outputDirectory = fileSystem.directory(
+      final Directory outputDirectory = fileSystem.directory(fileSystem.path.join('lib', 'l10n'));
-        fileSystem.path.join('.dart_tool', 'flutter_gen', 'gen_l10n'),
-      );
       expect(outputDirectory.existsSync(), true);
       expect(outputDirectory.childFile('app_localizations_en.dart').existsSync(), true);
       expect(outputDirectory.childFile('app_localizations.dart').existsSync(), true);
     },
     overrides: <Type, Generator>{
+      FeatureFlags: enableExplicitPackageDependencies,
       FileSystem: () => fileSystem,
       ProcessManager: () => FakeProcessManager.any(),
     },
@@ -211,14 +210,13 @@ flutter:
         logger.statusText,
         contains('Because l10n.yaml exists, the options defined there will be used instead.'),
       );
-      final Directory outputDirectory = fileSystem.directory(
+      final Directory outputDirectory = fileSystem.directory(fileSystem.path.join('lib', 'l10n'));
-        fileSystem.path.join('.dart_tool', 'flutter_gen', 'gen_l10n'),
-      );
       expect(outputDirectory.existsSync(), true);
       expect(outputDirectory.childFile('app_localizations_en.dart').existsSync(), true);
       expect(outputDirectory.childFile('app_localizations.dart').existsSync(), true);
     },
     overrides: <Type, Generator>{
+      FeatureFlags: enableExplicitPackageDependencies,
       FileSystem: () => fileSystem,
       ProcessManager: () => FakeProcessManager.any(),
     },
@@ -273,8 +271,8 @@ flutter:
           command: <String>[
             'Artifact.engineDartBinary',
             'format',
-            '/.dart_tool/flutter_gen/gen_l10n/app_localizations_en.dart',
+            '/lib/l10n/app_localizations_en.dart',
-            '/.dart_tool/flutter_gen/gen_l10n/app_localizations.dart',
+            '/lib/l10n/app_localizations.dart',
           ],
         ),
       );
@@ -288,15 +286,14 @@ flutter:
 
       await createTestCommandRunner(command).run(<String>['gen-l10n', '--format']);
 
-      final Directory outputDirectory = fileSystem.directory(
+      final Directory outputDirectory = fileSystem.directory(fileSystem.path.join('lib', 'l10n'));
-        fileSystem.path.join('.dart_tool', 'flutter_gen', 'gen_l10n'),
-      );
       expect(outputDirectory.existsSync(), true);
       expect(outputDirectory.childFile('app_localizations_en.dart').existsSync(), true);
       expect(outputDirectory.childFile('app_localizations.dart').existsSync(), true);
       expect(processManager, hasNoRemainingExpectations);
     },
     overrides: <Type, Generator>{
+      FeatureFlags: enableExplicitPackageDependencies,
       FileSystem: () => fileSystem,
       ProcessManager: () => FakeProcessManager.any(),
     },
@@ -325,8 +322,8 @@ format: true
           command: <String>[
             'Artifact.engineDartBinary',
             'format',
-            '/.dart_tool/flutter_gen/gen_l10n/app_localizations_en.dart',
+            '/lib/l10n/app_localizations_en.dart',
-            '/.dart_tool/flutter_gen/gen_l10n/app_localizations.dart',
+            '/lib/l10n/app_localizations.dart',
           ],
         ),
       );
@@ -338,15 +335,14 @@ format: true
       );
       await createTestCommandRunner(command).run(<String>['gen-l10n']);
 
-      final Directory outputDirectory = fileSystem.directory(
+      final Directory outputDirectory = fileSystem.directory(fileSystem.path.join('lib', 'l10n'));
-        fileSystem.path.join('.dart_tool', 'flutter_gen', 'gen_l10n'),
-      );
       expect(outputDirectory.existsSync(), true);
       expect(outputDirectory.childFile('app_localizations_en.dart').existsSync(), true);
       expect(outputDirectory.childFile('app_localizations.dart').existsSync(), true);
       expect(processManager, hasNoRemainingExpectations);
     },
     overrides: <Type, Generator>{
+      FeatureFlags: enableExplicitPackageDependencies,
       FileSystem: () => fileSystem,
       ProcessManager: () => FakeProcessManager.any(),
     },
@@ -381,9 +377,9 @@ untranslated-messages-file: lib/l10n/untranslated.json
           command: <String>[
             'Artifact.engineDartBinary',
             'format',
-            '/.dart_tool/flutter_gen/gen_l10n/app_localizations_en.dart',
+            '/lib/l10n/app_localizations_en.dart',
-            '/.dart_tool/flutter_gen/gen_l10n/app_localizations_es.dart',
+            '/lib/l10n/app_localizations_es.dart',
-            '/.dart_tool/flutter_gen/gen_l10n/app_localizations.dart',
+            '/lib/l10n/app_localizations.dart',
           ],
         ),
       );
@@ -395,9 +391,7 @@ untranslated-messages-file: lib/l10n/untranslated.json
       );
       await createTestCommandRunner(command).run(<String>['gen-l10n']);
 
-      final Directory outputDirectory = fileSystem.directory(
+      final Directory outputDirectory = fileSystem.directory(fileSystem.path.join('lib', 'l10n'));
-        fileSystem.path.join('.dart_tool', 'flutter_gen', 'gen_l10n'),
-      );
       expect(outputDirectory.existsSync(), true);
       expect(outputDirectory.childFile('app_localizations_en.dart').existsSync(), true);
       expect(outputDirectory.childFile('app_localizations_es.dart').existsSync(), true);
@@ -409,6 +403,7 @@ untranslated-messages-file: lib/l10n/untranslated.json
       expect(processManager, hasNoRemainingExpectations);
     },
     overrides: <Type, Generator>{
+      FeatureFlags: enableExplicitPackageDependencies,
       FileSystem: () => fileSystem,
       ProcessManager: () => FakeProcessManager.any(),
     },
@@ -484,9 +479,7 @@ format: true
       );
       await createTestCommandRunner(command).run(<String>['gen-l10n']);
 
-      final Directory outputDirectory = fileSystem.directory(
+      final Directory outputDirectory = fileSystem.directory(fileSystem.path.join('lib', 'l10n'));
-        fileSystem.path.join('.dart_tool', 'flutter_gen', 'gen_l10n'),
-      );
       expect(outputDirectory.existsSync(), isTrue);
       expect(outputDirectory.childFile('app_localizations.dart').existsSync(), isTrue);
       expect(
@@ -495,6 +488,7 @@ format: true
       );
     },
     overrides: <Type, Generator>{
+      FeatureFlags: enableExplicitPackageDependencies,
       FileSystem: () => fileSystem,
       ProcessManager: () => FakeProcessManager.any(),
     },
@@ -630,14 +624,13 @@ format: true
         );
         await createTestCommandRunner(command).run(<String>['gen-l10n']);
 
-        final Directory outputDirectory = fileSystem.directory(
+        final Directory outputDirectory = fileSystem.directory(fileSystem.path.join('lib', 'l10n'));
-          fileSystem.path.join('.dart_tool', 'flutter_gen', 'gen_l10n'),
-        );
         expect(outputDirectory.existsSync(), true);
         expect(outputDirectory.childFile('app_localizations_en.dart').existsSync(), true);
         expect(outputDirectory.childFile('app_localizations.dart').existsSync(), true);
       },
       overrides: <Type, Generator>{
+        FeatureFlags: enableExplicitPackageDependencies,
         FileSystem: () => fileSystem,
         ProcessManager: () => FakeProcessManager.any(),
       },

packages/flutter_tools/test/general.shard/generate_localizations_test.dart

@@ -13,7 +13,7 @@ import 'package:flutter_tools/src/localizations/localizations_utils.dart';
 import 'package:yaml/yaml.dart';
 
 import '../src/common.dart';
-import '../src/fake_process_manager.dart';
+import '../src/context.dart';
 
 const String defaultTemplateArbFileName = 'app_en.arb';
 const String defaultOutputFileString = 'output-localization-file.dart';
@@ -834,7 +834,7 @@ class FooEn extends Foo {
 ''');
     });
 
-    testWithoutContext('throws exception on missing flutter: generate: true flag', () async {
+    testUsingContext('throws exception on missing flutter: generate: true flag', () async {
       _standardFlutterDirectoryL10nSetup(fs);
 
       // Missing flutter: generate: true should throw exception.
@@ -875,7 +875,7 @@ flutter:
       );
     });
 
-    testWithoutContext('uses the same line terminator as pubspec.yaml', () async {
+    testUsingContext('uses the same line terminator as pubspec.yaml', () async {
       _standardFlutterDirectoryL10nSetup(fs);
 
       fs.file('pubspec.yaml')

packages/flutter_tools/test/general.shard/resident_web_runner_test.dart

@@ -1315,9 +1315,8 @@ flutter:
 ''');
       expect(await residentWebRunner.run(), 0);
       final File generatedLocalizationsFile = globals.fs
-          .directory('.dart_tool')
+          .directory('lib')
-          .childDirectory('flutter_gen')
+          .childDirectory('l10n')
-          .childDirectory('gen_l10n')
           .childFile('app_localizations.dart');
       expect(generatedLocalizationsFile.existsSync(), isTrue);
       // Completing this future ensures that the daemon can exit correctly.