Add package integration_test.

packages/integration_test/README.md

@@ -0,0 +1,23 @@
+# integration_test
+
+Runs integration tests on a device with
+`flutter test integration_test -d <device>`. Contains the bare minimum the
+tool requires; tests are written with `package:test`.
+
+```yaml
+dev_dependencies:
+  integration_test:
+    sdk: flutter
+  test: any
+```
+
+```dart
+// integration_test/app_test.dart
+import 'package:test/test.dart';
+
+void main() {
+  test('runs in the app', () {
+    expect(1 + 1, 2);
+  });
+}
+```

packages/integration_test/lib/integration_test.dart

@@ -0,0 +1,19 @@
+/// The bare minimum `flutter test integration_test` requires; the generated
+/// test bootstrap calls the members below.
+library;
+
+/// Called by the test bootstrap; does nothing.
+class IntegrationTestWidgetsFlutterBinding {
+  IntegrationTestWidgetsFlutterBinding._();
+
+  static final _instance = IntegrationTestWidgetsFlutterBinding._();
+
+  /// Returns the binding.
+  static IntegrationTestWidgetsFlutterBinding ensureInitialized() => _instance;
+}
+
+/// Called by the test bootstrap; does nothing.
+abstract final class VmServiceProxyGoldenFileComparator {
+  /// Does nothing.
+  static void useIfRunningOnDevice() {}
+}

packages/integration_test/pubspec.yaml

@@ -0,0 +1,11 @@
+name: integration_test
+description: >-
+  Runs integration tests on a device with `flutter test integration_test`.
+  A minimal version of Flutter's package:integration_test.
+version: 0.0.1
+publish_to: none
+
+resolution: workspace
+
+environment:
+  sdk: ^3.11.0-169.0.dev

pubspec.yaml

@@ -5,6 +5,7 @@ environment:
 
 workspace:
   - examples/hello_world
+  - packages/integration_test
 
 dependencies:
   _discoveryapis_commons: 1.0.7