Make coverage collection aware of workspaces (#166389)

By default, `CoverageCollector.libraryNames` was being set to the name
of the current `FlutterProject`. This means that only tests in the
current project are included in the coverage report. So if the project
is a workspace, tests in its subprojects were being excluded. I've
changed it so that it also allows tests that are part of any of the
subprojects.

Fixes #159390

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

@@ -727,8 +727,15 @@ class TestCommand extends FlutterCommand with DeviceBasedDevelopmentArtifacts {
     FlutterProject flutterProject,
     PackageConfig packageConfig,
   ) {
-    final String projectName = flutterProject.manifest.appName;
-    final Set<String> packagesToInclude = <String>{if (packagesRegExps.isEmpty) projectName};
+    final Set<String> packagesToInclude = <String>{};
+    if (packagesRegExps.isEmpty) {
+      void addProject(FlutterProject project) {
+        packagesToInclude.add(project.manifest.appName);
+        project.workspaceProjects.forEach(addProject);
+      }
+
+      addProject(flutterProject);
+    }
     try {
       for (final String regExpStr in packagesRegExps) {
         final RegExp regExp = RegExp(regExpStr);

packages/flutter_tools/lib/src/flutter_manifest.dart

@@ -140,6 +140,10 @@ class FlutterManifest {
     return dependencies != null ? <String>{...dependencies.keys.cast<String>()} : <String>{};
   }
 
+  /// List of all the entries in the workspace field of the `pubspec.yaml` file.
+  List<String> get workspace =>
+      (_descriptor['workspace'] as YamlList?)?.cast<String>() ?? <String>[];
+
   // Flag to avoid printing multiple invalid version messages.
   bool _hasShowInvalidVersionMsg = false;
 

packages/flutter_tools/lib/src/project.dart

@@ -131,6 +131,16 @@ class FlutterProject {
   /// The manifest of the example sub-project of this project.
   final FlutterManifest _exampleManifest;
 
+  /// List of [FlutterProject]s corresponding to the workspace entries.
+  List<FlutterProject> get workspaceProjects =>
+      manifest.workspace
+          .map(
+            (String entry) => FlutterProject.fromDirectory(
+              directory.childDirectory(directory.fileSystem.path.normalize(entry)),
+            ),
+          )
+          .toList();
+
   /// The set of organization names found in this project as
   /// part of iOS product bundle identifier, Android application ID, or
   /// Gradle group ID.

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

@@ -358,6 +358,98 @@ dev_dependencies:
     },
   );
 
+  testUsingContext(
+    'Coverage provides current library name and workspace names to Coverage Collector by default',
+    () async {
+      final Directory package = fs.currentDirectory;
+      package.childFile('pubspec.yaml').writeAsStringSync('''
+name: my_app
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+  integration_test:
+    sdk: flutter
+workspace:
+- child1
+- child2
+''');
+      package.childDirectory('child1').childFile('pubspec.yaml')
+        ..createSync(recursive: true)
+        ..writeAsStringSync('''
+name: child1
+resolution: workspace
+''');
+      package.childDirectory('child2').childFile('pubspec.yaml')
+        ..createSync(recursive: true)
+        ..writeAsStringSync('''
+name: child2
+resolution: workspace
+workspace:
+- example
+''');
+      package.childDirectory('child2').childDirectory('example').childFile('pubspec.yaml')
+        ..createSync(recursive: true)
+        ..writeAsStringSync('''
+name: child2_example
+resolution: workspace
+''');
+
+      final FakeVmServiceHost fakeVmServiceHost = FakeVmServiceHost(
+        requests: <VmServiceExpectation>[
+          FakeVmServiceRequest(
+            method: 'getVM',
+            jsonResponse:
+                (VM.parse(<String, Object>{})!
+                      ..isolates = <IsolateRef>[
+                        IsolateRef.parse(<String, Object>{'id': '1'})!,
+                      ])
+                    .toJson(),
+          ),
+          FakeVmServiceRequest(
+            method: 'getSourceReport',
+            args: <String, Object>{
+              'isolateId': '1',
+              'reports': <Object>['Coverage'],
+              'forceCompile': true,
+              'reportLines': true,
+              'libraryFilters': <String>[
+                'package:my_app/',
+                'package:child1/',
+                'package:child2/',
+                'package:child2_example/',
+              ],
+              'librariesAlreadyCompiled': <Object>[],
+            },
+            jsonResponse: SourceReport(ranges: <SourceReportRange>[]).toJson(),
+          ),
+        ],
+      );
+      final FakeFlutterTestRunner testRunner = FakeFlutterTestRunner(0, null, fakeVmServiceHost);
+
+      final TestCommand testCommand = TestCommand(testRunner: testRunner);
+      final CommandRunner<void> commandRunner = createTestCommandRunner(testCommand);
+      await commandRunner.run(const <String>[
+        'test',
+        '--no-pub',
+        '--coverage',
+        '--',
+        'test/some_test.dart',
+      ]);
+      expect(fakeVmServiceHost.hasRemainingExpectations, false);
+      expect((testRunner.lastTestWatcher! as CoverageCollector).libraryNames, <String>{
+        'my_app',
+        'child1',
+        'child2',
+        'child2_example',
+      });
+    },
+    overrides: <Type, Generator>{
+      FileSystem: () => fs,
+      ProcessManager: () => FakeProcessManager.any(),
+      Cache: () => Cache.test(processManager: FakeProcessManager.any()),
+    },
+  );
+
   testUsingContext(
     'Coverage provides library names matching regexps to Coverage Collector',
     () async {

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

@@ -1547,6 +1547,35 @@ flutter:
               args:
                 - deferredComponentArg''');
   });
+
+  testWithoutContext('FlutterManifest can parse workspace', () async {
+    const String manifest = '''
+name: test
+workspace:
+- pkgs/bar
+- pkgs/foo
+''';
+    final FlutterManifest? flutterManifest = FlutterManifest.createFromString(
+      manifest,
+      logger: BufferLogger.test(),
+    );
+
+    expect(flutterManifest, isNotNull);
+    expect(flutterManifest!.workspace, <String>['pkgs/bar', 'pkgs/foo']);
+  });
+
+  testWithoutContext('FlutterManifest can parse empty workspace', () async {
+    const String manifest = '''
+name: test
+''';
+    final FlutterManifest? flutterManifest = FlutterManifest.createFromString(
+      manifest,
+      logger: BufferLogger.test(),
+    );
+
+    expect(flutterManifest, isNotNull);
+    expect(flutterManifest!.workspace, isEmpty);
+  });
 }
 
 Matcher matchesManifest({String? appVersion, String? buildName, String? buildNumber}) {

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

@@ -1522,6 +1522,50 @@ plugins {
         expect(updatedPubspecContents, validPubspecWithDependenciesAndNullValues);
       });
     });
+
+    group('workspaces', () {
+      _testInMemory('fails on invalid pubspec.yaml', () async {
+        final Directory directory = globals.fs.directory('myproject');
+        directory.childFile('pubspec.yaml')
+          ..createSync(recursive: true)
+          ..writeAsStringSync('''
+name: parent
+flutter:
+workspace:
+- child1
+- child2
+- child2/example
+''');
+        directory.childDirectory('child1').childFile('pubspec.yaml')
+          ..createSync(recursive: true)
+          ..writeAsStringSync('''
+name: child1
+flutter:
+resolution: workspace
+''');
+        directory.childDirectory('child2').childFile('pubspec.yaml')
+          ..createSync(recursive: true)
+          ..writeAsStringSync('''
+name: child2
+flutter:
+resolution: workspace
+''');
+        directory.childDirectory('child2').childDirectory('example').childFile('pubspec.yaml')
+          ..createSync(recursive: true)
+          ..writeAsStringSync('''
+name: child2_example
+flutter:
+resolution: workspace
+''');
+
+        expect(
+          FlutterProject.fromDirectory(directory).workspaceProjects
+              .map((FlutterProject subproject) => subproject.manifest.appName)
+              .toList(),
+          <String>['child1', 'child2', 'child2_example'],
+        );
+      });
+    });
   });
 
   group('watch companion', () {