Remove unnecessary null checks in flutter_driver (#118864)

packages/flutter_driver/lib/src/common/diagnostics_tree.dart

@@ -28,8 +28,7 @@ class GetDiagnosticsTree extends CommandWithTarget {
     this.subtreeDepth = 0,
     this.includeProperties = true,
     super.timeout,
-  }) : assert(subtreeDepth != null),
+  });
-       assert(includeProperties != null);
 
   /// Deserializes this command from the value generated by [serialize].
   GetDiagnosticsTree.deserialize(super.json, super.finderFactory)

packages/flutter_driver/lib/src/common/find.dart

@@ -23,9 +23,7 @@ DriverError _createInvalidKeyValueTypeError(String invalidType) {
 /// and add more keys to the returned map.
 abstract class CommandWithTarget extends Command {
   /// Constructs this command given a [finder].
-  CommandWithTarget(this.finder, {super.timeout}) {
+  CommandWithTarget(this.finder, {super.timeout});
-    assert(finder != null, '$runtimeType target cannot be null');
-  }
 
   /// Deserializes this command from the value generated by [serialize].
   CommandWithTarget.deserialize(super.json, DeserializeFinderFactory finderFactory)

packages/flutter_driver/lib/src/common/handler_factory.dart

@@ -260,7 +260,6 @@ mixin CommandHandlerFactory {
   }
 
   Future<Result> _waitForCondition(Command command) async {
-    assert(command != null);
     final WaitForCondition waitForConditionCommand = command as WaitForCondition;
     final WaitCondition condition = deserializeCondition(waitForConditionCommand.condition);
     await condition.wait();

packages/flutter_driver/lib/src/common/health.dart

@@ -36,8 +36,7 @@ final EnumIndex<HealthStatus> _healthStatusIndex =
 /// [FlutterDriver.checkHealth] test.
 class Health extends Result {
   /// Creates a [Health] object with the given [status].
-  const Health(this.status)
+  const Health(this.status);
-    : assert(status != null);
 
   /// The status represented by this object.
   ///

packages/flutter_driver/lib/src/common/wait.dart

@@ -11,15 +11,13 @@ class WaitForCondition extends Command {
   /// Creates a command that waits for the given [condition] is met.
   ///
   /// The [condition] argument must not be null.
-  const WaitForCondition(this.condition, {super.timeout})
+  const WaitForCondition(this.condition, {super.timeout});
-      : assert(condition != null);
 
   /// Deserializes this command from the value generated by [serialize].
   ///
   /// The [json] argument cannot be null.
   WaitForCondition.deserialize(super.json)
-      : assert(json != null),
+      : condition = _deserialize(json),
-        condition = _deserialize(json),
         super.deserialize();
 
   /// The condition that this command shall wait for.
@@ -94,7 +92,6 @@ class NoTransientCallbacks extends SerializableWaitCondition {
   ///
   /// The [json] argument must not be null.
   factory NoTransientCallbacks.deserialize(Map<String, String> json) {
-    assert(json != null);
     if (json['conditionName'] != 'NoTransientCallbacksCondition') {
       throw SerializationException('Error occurred during deserializing the NoTransientCallbacksCondition JSON string: $json');
     }
@@ -115,7 +112,6 @@ class NoPendingFrame extends SerializableWaitCondition {
   ///
   /// The [json] argument must not be null.
   factory NoPendingFrame.deserialize(Map<String, String> json) {
-    assert(json != null);
     if (json['conditionName'] != 'NoPendingFrameCondition') {
       throw SerializationException('Error occurred during deserializing the NoPendingFrameCondition JSON string: $json');
     }
@@ -136,7 +132,6 @@ class FirstFrameRasterized extends SerializableWaitCondition {
   ///
   /// The [json] argument must not be null.
   factory FirstFrameRasterized.deserialize(Map<String, String> json) {
-    assert(json != null);
     if (json['conditionName'] != 'FirstFrameRasterizedCondition') {
       throw SerializationException('Error occurred during deserializing the FirstFrameRasterizedCondition JSON string: $json');
     }
@@ -160,7 +155,6 @@ class NoPendingPlatformMessages extends SerializableWaitCondition {
   ///
   /// The [json] argument must not be null.
   factory NoPendingPlatformMessages.deserialize(Map<String, String> json) {
-    assert(json != null);
     if (json['conditionName'] != 'NoPendingPlatformMessagesCondition') {
       throw SerializationException('Error occurred during deserializing the NoPendingPlatformMessagesCondition JSON string: $json');
     }
@@ -176,15 +170,13 @@ class CombinedCondition extends SerializableWaitCondition {
   /// Creates a [CombinedCondition] condition.
   ///
   /// The [conditions] argument must not be null.
-  const CombinedCondition(this.conditions)
+  const CombinedCondition(this.conditions);
-      : assert(conditions != null);
 
   /// Factory constructor to parse a [CombinedCondition] instance from the
   /// given JSON map.
   ///
   /// The [jsonMap] argument must not be null.
   factory CombinedCondition.deserialize(Map<String, String> jsonMap) {
-    assert(jsonMap != null);
     if (jsonMap['conditionName'] != 'CombinedCondition') {
       throw SerializationException('Error occurred during deserializing the CombinedCondition JSON string: $jsonMap');
     }
@@ -210,7 +202,6 @@ class CombinedCondition extends SerializableWaitCondition {
     final Map<String, String> jsonMap = super.serialize();
     final List<Map<String, String>> jsonConditions = conditions.map(
       (SerializableWaitCondition condition) {
-        assert(condition != null);
         return condition.serialize();
       }).toList();
     jsonMap['conditions'] = json.encode(jsonConditions);
@@ -222,7 +213,6 @@ class CombinedCondition extends SerializableWaitCondition {
 ///
 /// The [json] argument must not be null.
 SerializableWaitCondition _deserialize(Map<String, String> json) {
-  assert(json != null);
   final String conditionName = json['conditionName']!;
   switch (conditionName) {
     case 'NoTransientCallbacksCondition':

packages/flutter_driver/lib/src/driver/driver.dart

@@ -432,11 +432,6 @@ abstract class FlutterDriver {
     double dyScroll = 0.0,
     Duration? timeout,
   }) async {
-    assert(scrollable != null);
-    assert(item != null);
-    assert(alignment != null);
-    assert(dxScroll != null);
-    assert(dyScroll != null);
     assert(dxScroll != 0.0 || dyScroll != 0.0);
 
     // Kick off an (unawaited) waitFor that will complete when the item we're
@@ -509,7 +504,6 @@ abstract class FlutterDriver {
   /// invoked when the widget is focused, as the [SystemChannels.textInput]
   /// channel will be mocked out.
   Future<void> setTextEntryEmulation({ required bool enabled, Duration? timeout }) async {
-    assert(enabled != null);
     await sendCommand(SetTextEntryEmulation(enabled, timeout: timeout));
   }
 
@@ -537,7 +531,6 @@ abstract class FlutterDriver {
   ///
   Future<void> sendTextInputAction(TextInputAction action,
       {Duration? timeout}) async {
-    assert(action != null);
     await sendCommand(SendTextInputAction(action, timeout: timeout));
   }
 

packages/flutter_driver/lib/src/driver/vmservice_driver.dart

@@ -144,7 +144,7 @@ class VMServiceFlutterDriver extends FlutterDriver {
       // Let subsequent isolates start automatically.
       try {
         final vms.Response result = await client.setFlag('pause_isolates_on_start', 'false');
-        if (result == null || result.type != 'Success') {
+        if (result.type != 'Success') {
           _log('setFlag failure: $result');
         }
       } catch (e) {
@@ -348,7 +348,6 @@ class VMServiceFlutterDriver extends FlutterDriver {
       _log(message);
     }
     if (_logCommunicationToFile) {
-      assert(_logFilePathName != null);
       final f.File file = fs.file(_logFilePathName);
       file.createSync(recursive: true); // no-op if file exists
       file.writeAsStringSync('${DateTime.now()} $message\n', mode: f.FileMode.append, flush: true);
@@ -380,8 +379,7 @@ class VMServiceFlutterDriver extends FlutterDriver {
     List<TimelineStream> streams = const <TimelineStream>[TimelineStream.all],
     Duration timeout = kUnusuallyLongTimeout,
   }) async {
-    assert(streams != null && streams.isNotEmpty);
+    assert(streams.isNotEmpty);
-    assert(timeout != null);
     try {
       await _warnIfSlow<vms.Success>(
         future: _serviceClient.setVMTimelineFlags(
@@ -405,7 +403,6 @@ class VMServiceFlutterDriver extends FlutterDriver {
     int? startTime,
     int? endTime,
   }) async {
-    assert(timeout != null);
     assert((startTime == null && endTime == null) ||
            (startTime != null && endTime != null));
 
@@ -497,7 +494,6 @@ class VMServiceFlutterDriver extends FlutterDriver {
   Future<void> clearTimeline({
     Duration timeout = kUnusuallyLongTimeout,
   }) async {
-    assert(timeout != null);
     try {
       await _warnIfSlow<vms.Success>(
         future: _serviceClient.clearVMTimeline(),
@@ -630,9 +626,6 @@ Future<T> _warnIfSlow<T>({
   required Duration timeout,
   required String message,
 }) async {
-  assert(future != null);
-  assert(timeout != null);
-  assert(message != null);
   final Completer<void> completer = Completer<void>();
   completer.future.timeout(timeout, onTimeout: () {
     _log(message);

packages/flutter_driver/lib/src/driver/web_driver.dart

@@ -174,7 +174,6 @@ class WebFlutterDriver extends FlutterDriver {
       driverLog('WebFlutterDriver', message);
     }
     if (_logCommunicationToFile) {
-      assert(_logFilePathName != null);
       final File file = fs.file(_logFilePathName);
       file.createSync(recursive: true); // no-op if file exists
       file.writeAsStringSync('${DateTime.now()} $message\n', mode: FileMode.append, flush: true);

packages/flutter_driver/lib/src/extension/extension.dart

@@ -319,7 +319,7 @@ class FlutterDriverExtension with DeserializeFinderFactory, CreateFinderFactory,
     this._enableTextEntryEmulation, {
     List<FinderExtension> finders = const <FinderExtension>[],
     List<CommandExtension> commands = const <CommandExtension>[],
-  }) : assert(finders != null) {
+  }) {
     if (_enableTextEntryEmulation) {
       registerTextInput();
     }

packages/flutter_driver/lib/src/extension/wait_conditions.dart

@@ -42,7 +42,6 @@ class _InternalNoTransientCallbacksCondition implements WaitCondition {
   ///
   /// The [condition] argument must not be null.
   factory _InternalNoTransientCallbacksCondition.deserialize(SerializableWaitCondition condition) {
-    assert(condition != null);
     if (condition.conditionName != 'NoTransientCallbacksCondition') {
       throw SerializationException('Error occurred during deserializing from the given condition: ${condition.serialize()}');
     }
@@ -71,7 +70,6 @@ class _InternalNoPendingFrameCondition implements WaitCondition {
   ///
   /// The [condition] argument must not be null.
   factory _InternalNoPendingFrameCondition.deserialize(SerializableWaitCondition condition) {
-    assert(condition != null);
     if (condition.conditionName != 'NoPendingFrameCondition') {
       throw SerializationException('Error occurred during deserializing from the given condition: ${condition.serialize()}');
     }
@@ -100,7 +98,6 @@ class _InternalFirstFrameRasterizedCondition implements WaitCondition {
   ///
   /// The [condition] argument must not be null.
   factory _InternalFirstFrameRasterizedCondition.deserialize(SerializableWaitCondition condition) {
-    assert(condition != null);
     if (condition.conditionName != 'FirstFrameRasterizedCondition') {
       throw SerializationException('Error occurred during deserializing from the given condition: ${condition.serialize()}');
     }
@@ -127,7 +124,6 @@ class _InternalNoPendingPlatformMessagesCondition implements WaitCondition {
   ///
   /// The [condition] argument must not be null.
   factory _InternalNoPendingPlatformMessagesCondition.deserialize(SerializableWaitCondition condition) {
-    assert(condition != null);
     if (condition.conditionName != 'NoPendingPlatformMessagesCondition') {
       throw SerializationException('Error occurred during deserializing from the given condition: ${condition.serialize()}');
     }
@@ -156,15 +152,13 @@ class _InternalCombinedCondition implements WaitCondition {
   /// [conditions].
   ///
   /// The [conditions] argument must not be null.
-  const _InternalCombinedCondition(this.conditions)
+  const _InternalCombinedCondition(this.conditions);
-      : assert(conditions != null);
 
   /// Factory constructor to parse an [_InternalCombinedCondition] instance from
   /// the given [SerializableWaitCondition] instance.
   ///
   /// The [condition] argument must not be null.
   factory _InternalCombinedCondition.deserialize(SerializableWaitCondition condition) {
-    assert(condition != null);
     if (condition.conditionName != 'CombinedCondition') {
       throw SerializationException('Error occurred during deserializing from the given condition: ${condition.serialize()}');
     }
@@ -185,7 +179,6 @@ class _InternalCombinedCondition implements WaitCondition {
   Future<void> wait() async {
     while (!condition) {
       for (final WaitCondition condition in conditions) {
-        assert (condition != null);
         await condition.wait();
       }
     }
@@ -197,7 +190,6 @@ class _InternalCombinedCondition implements WaitCondition {
 ///
 /// The [waitCondition] argument must not be null.
 WaitCondition deserializeCondition(SerializableWaitCondition waitCondition) {
-  assert(waitCondition != null);
   final String conditionName = waitCondition.conditionName;
   switch (conditionName) {
     case 'NoTransientCallbacksCondition':

packages/flutter_driver/test/src/real_tests/flutter_driver_test.dart

@@ -1193,9 +1193,9 @@ class FakeVmService extends Fake implements vms.VmService {
     commandLog.add('$method $args');
     await artificialExtensionDelay;
 
-    final vms.Response response = responses[args!['command']]!;
+    final vms.Response? response = responses[args!['command']];
     assert(response != null, 'Failed to create a response for ${args['command']}');
-    return response;
+    return response!;
   }
 
   @override
@@ -1243,9 +1243,9 @@ class FakeVmService extends Fake implements vms.VmService {
   @override
   Future<vms.Timeline> getVMTimeline({int? timeOriginMicros, int? timeExtentMicros}) async {
     connectionLog.add('getVMTimeline $timeOriginMicros $timeExtentMicros');
-    final vms.Timeline timeline = timelineResponses[timeOriginMicros ?? 1]!;
+    final vms.Timeline? timeline = timelineResponses[timeOriginMicros ?? 1];
     assert(timeline != null, 'Missing entry in timelineResponses[$timeOriginMicros]');
-    return timeline;
+    return timeline!;
   }
 
   @override