Cleanup random dead test code (#104568)

packages/flutter_driver/test/common.dart

@@ -8,10 +8,7 @@ import 'package:flutter_driver/src/common/error.dart';
 import 'package:test_api/test_api.dart'; // ignore: deprecated_member_use
 
 export 'package:test_api/fake.dart'; // ignore: deprecated_member_use
-export 'package:test_api/test_api.dart' hide isInstanceOf; // ignore: deprecated_member_use
-
-/// A matcher that compares the type of the actual value to the type argument T.
-TypeMatcher<T> isInstanceOf<T>() => isA<T>();
+export 'package:test_api/test_api.dart'; // ignore: deprecated_member_use
 
 void tryToDelete(Directory directory) {
   // This should not be necessary, but it turns out that
@@ -26,6 +23,3 @@ void tryToDelete(Directory directory) {
 
 /// Matcher for functions that throw [DriverError].
 final Matcher throwsDriverError = throwsA(isA<DriverError>());
-
-/// Matcher for functions that throw [AssertionError].
-final Matcher throwsAssertionError = throwsA(isA<AssertionError>());

packages/flutter_goldens/test/flutter_goldens_test.dart

@@ -4,7 +4,6 @@
 
 // See also dev/automated_tests/flutter_test/flutter_gold_test.dart
 
-import 'dart:async';
 import 'dart:convert';
 import 'dart:io' hide Directory;
 import 'dart:typed_data';
@@ -1090,23 +1089,6 @@ class FakeHttpClientRequest extends Fake implements HttpClientRequest {
   }
 }
 
-class FakeHttpClientResponse extends Fake implements HttpClientResponse {
-  FakeHttpClientResponse(this.response);
-
-  final List<int> response;
-
-  @override
-  StreamSubscription<List<int>> listen(
-    void Function(List<int> event)? onData, {
-      Function? onError,
-      void Function()? onDone,
-      bool? cancelOnError,
-    }) {
-    return Stream<List<int>>.fromFuture(Future<List<int>>.value(response))
-      .listen(onData, onError: onError, onDone: onDone, cancelOnError: cancelOnError);
-  }
-}
-
 class FakeHttpImageResponse extends Fake implements HttpClientResponse {
   FakeHttpImageResponse(this.response);
 

packages/flutter_test/test/widget_tester_test.dart

@@ -782,31 +782,6 @@ class FakeMatcher extends AsyncMatcher {
   Description describe(Description description) => description.add('--fake--');
 }
 
-class _SingleTickerTest extends StatefulWidget {
-  const _SingleTickerTest();
-
-  @override
-  _SingleTickerTestState createState() => _SingleTickerTestState();
-}
-
-class _SingleTickerTestState extends State<_SingleTickerTest> with SingleTickerProviderStateMixin {
-  late AnimationController controller;
-
-  @override
-  void initState() {
-    super.initState();
-    controller = AnimationController(
-      vsync: this,
-      duration: const Duration(seconds: 100),
-    )  ;
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    return Container();
-  }
-}
-
 class _AlwaysAnimating extends StatefulWidget {
   const _AlwaysAnimating({
     required this.onPaint,

packages/fuchsia_remote_debug_protocol/test/common.dart

-// Copyright 2014 The Flutter Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-import 'package:test/test.dart';
-
-export 'package:test/test.dart' hide isInstanceOf;
-
-/// A matcher that compares the type of the actual value to the type argument T.
-TypeMatcher<T> isInstanceOf<T>() => isA<T>();

packages/fuchsia_remote_debug_protocol/test/fuchsia_remote_connection_test.dart

@@ -4,10 +4,9 @@
 
 import 'package:fuchsia_remote_debug_protocol/fuchsia_remote_debug_protocol.dart';
 import 'package:test/fake.dart';
+import 'package:test/test.dart';
 import 'package:vm_service/vm_service.dart' as vms;
 
-import 'common.dart';
-
 void main() {
   group('FuchsiaRemoteConnection.connect', () {
     late List<FakePortForwarder> forwardedPorts;

packages/fuchsia_remote_debug_protocol/test/src/common/network_test.dart

@@ -4,7 +4,7 @@
 
 import 'package:fuchsia_remote_debug_protocol/src/common/network.dart';
 
-import '../../common.dart';
+import 'package:test/test.dart';
 
 void main() {
   final List<String> ipv4Addresses = <String>['127.0.0.1', '8.8.8.8'];

packages/fuchsia_remote_debug_protocol/test/src/dart/dart_vm_test.dart

@@ -6,10 +6,9 @@ import 'dart:async';
 
 import 'package:fuchsia_remote_debug_protocol/src/dart/dart_vm.dart';
 import 'package:test/fake.dart';
+import 'package:test/test.dart';
 import 'package:vm_service/vm_service.dart' as vms;
 
-import '../../common.dart';
-
 void main() {
   group('DartVm.connect', () {
     tearDown(() {

packages/fuchsia_remote_debug_protocol/test/src/runners/ssh_command_runner_test.dart

@@ -9,7 +9,7 @@ import 'package:fuchsia_remote_debug_protocol/src/runners/ssh_command_runner.dar
 import 'package:process/process.dart';
 import 'package:test/fake.dart';
 
-import '../../common.dart';
+import 'package:test/test.dart';
 
 void main() {
   group('SshCommandRunner.constructors', () {