feat: add --flavor option to test command

lib/src/commands/test/test.dart

@@ -29,6 +29,7 @@ class FlutterTestOptions {
     required this.platform,
     required this.reportOn,
     required this.runSkipped,
+    required this.flavor,
     required this.rest,
   });
 
@@ -63,6 +64,7 @@ class FlutterTestOptions {
     final platform = argResults['platform'] as String?;
     final reportOn = argResults['report-on'] as String?;
     final runSkipped = argResults['run-skipped'] as bool;
+    final flavor = argResults['flavor'] as String?;
     final rest = argResults.rest;
 
     return FlutterTestOptions._(
@@ -84,6 +86,7 @@ class FlutterTestOptions {
       platform: platform,
       reportOn: reportOn,
       runSkipped: runSkipped,
+      flavor: flavor,
       rest: rest,
     );
   }
@@ -144,6 +147,9 @@ class FlutterTestOptions {
   /// Whether to run skipped tests instead of skipping them.
   final bool runSkipped;
 
+  /// The flavor to build for testing.
+  final String? flavor;
+
   /// The remaining arguments passed to the test command.
   final List<String> rest;
 }
@@ -314,6 +320,13 @@ class TestCommand extends Command<int> {
         'run-skipped',
         help: 'Run skipped tests instead of skipping them.',
         negatable: false,
+      )
+      ..addOption(
+        'flavor',
+        help:
+            'Build a custom app flavor as defined by platform-specific build '
+            'setup. Supports the use of product flavors in Android Gradle '
+            'scripts, and the use of custom Xcode schemes.',
       );
   }
 
@@ -383,6 +396,7 @@ This command should be run from the root of your Flutter project.''');
             if (options.updateGoldens) '--update-goldens',
             if (options.failFast) '--fail-fast',
             if (options.runSkipped) '--run-skipped',
+            if (options.flavor != null) ...['--flavor', options.flavor!],
             if (options.platform != null) ...['--platform', options.platform!],
             if (options.dartDefine != null)
               for (final value in options.dartDefine!) '--dart-define=$value',

test/src/commands/test/test_test.dart

@@ -49,6 +49,7 @@ const expectedTestUsage = [
       '    --platform=<chrome|vm|android|ios>                       The platform to run tests on. \n'
       '    --report-on=<lib/>                                       An optional file path to report coverage information to. This should be a path relative to the current working directory.\n'
       '    --run-skipped                                            Run skipped tests instead of skipping them.\n'
+      '    --flavor                                                 Build a custom app flavor as defined by platform-specific build setup. Supports the use of product flavors in Android Gradle scripts, and the use of custom Xcode schemes.\n'
       '\n'
       'Run "very_good help" to see global options.',
 ];
@@ -131,6 +132,7 @@ void main() {
       when<dynamic>(() => argResults['platform']).thenReturn(null);
       when<dynamic>(() => argResults['report-on']).thenReturn(null);
       when<dynamic>(() => argResults['run-skipped']).thenReturn(false);
+      when<dynamic>(() => argResults['flavor']).thenReturn(null);
       when<dynamic>(
         () => argResults['collect-coverage-from'],
       ).thenReturn('imports');
@@ -795,6 +797,21 @@ void main() {
       },
     );
 
+    test('completes normally --flavor development', () async {
+      when<dynamic>(() => argResults['flavor']).thenReturn('development');
+      final result = await testCommand.run();
+      expect(result, equals(ExitCode.success.code));
+      verify(
+        () => flutterTest(
+          optimizePerformance: true,
+          arguments: ['--flavor', 'development', ...defaultArguments],
+          logger: logger,
+          stdout: logger.write,
+          stderr: logger.err,
+        ),
+      ).called(1);
+    });
+
     test('completes normally --run-skipped', () async {
       when<dynamic>(() => argResults['run-skipped']).thenReturn(true);
       final result = await testCommand.run();