[flutter_tools] support github reporter (flutter#115137)

* [flutter_tools] support github reporter

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

Co-authored-by: Christopher Fujino <fujino@google.com>

Co-authored-by: Christopher Fujino <fujino@google.com>

Author: Jonah Williams

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

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-
-
 import 'dart:math' as math;
 
 import 'package:meta/meta.dart';
@@ -201,12 +199,12 @@ class TestCommand extends FlutterCommand with DeviceBasedDevelopmentArtifacts {
       )
       ..addOption('reporter',
         abbr: 'r',
-        defaultsTo: 'compact',
         help: 'Set how to print test results.',
-        allowed: <String>['compact', 'expanded', 'json'],
+        allowed: <String>['compact', 'expanded', 'github', 'json'],
         allowedHelp: <String, String>{
-          'compact':  'A single line that updates dynamically.',
+          'compact':  'A single line that updates dynamically (The default reporter).',
           'expanded': 'A separate line for each update. May be preferred when logging to a file or in continuous integration.',
+          'github':   'A custom reporter for GitHub Actions (the default reporter when running on GitHub Actions).',
           'json':     'A machine-readable format. See: https://dart.dev/go/test-docs/json_reporter.md',
         },
       )
@@ -256,6 +254,18 @@ class TestCommand extends FlutterCommand with DeviceBasedDevelopmentArtifacts {
   @override
   String get category => FlutterCommandCategory.project;
 
+  // Lookup the default reporter if one was not specified.
+  String _getReporter() {
+    final String? reporter = stringArgDeprecated('reporter');
+    if (reporter != null) {
+      return reporter;
+    }
+    if (globals.platform.environment['GITHUB_ACTIONS']?.toLowerCase() == 'true') {
+      return 'github';
+    }
+    return 'compact';
+  }
+
   @override
   Future<FlutterCommandResult> verifyThenRunCommand(String? commandPath) {
     _testFiles = argResults!.rest.map<String>(globals.fs.path.absolute).toList();
@@ -463,7 +473,7 @@ class TestCommand extends FlutterCommand with DeviceBasedDevelopmentArtifacts {
       flutterProject: flutterProject,
       web: stringArgDeprecated('platform') == 'chrome',
       randomSeed: stringArgDeprecated('test-randomize-ordering-seed'),
-      reporter: stringArgDeprecated('reporter'),
+      reporter: _getReporter(),
       timeout: stringArgDeprecated('timeout'),
       runSkipped: boolArgDeprecated('run-skipped'),
       shardIndex: shardIndex,

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

@@ -10,6 +10,7 @@ import 'package:file/memory.dart';
 import 'package:flutter_tools/src/base/common.dart';
 import 'package:flutter_tools/src/base/file_system.dart';
 import 'package:flutter_tools/src/base/logger.dart';
+import 'package:flutter_tools/src/base/platform.dart';
 import 'package:flutter_tools/src/cache.dart';
 import 'package:flutter_tools/src/commands/test.dart';
 import 'package:flutter_tools/src/device.dart';
@@ -660,6 +661,60 @@ dev_dependencies:
     ]),
   });
 
+  testUsingContext('Tests on github actions default to github reporter', () async {
+    final FakeFlutterTestRunner testRunner = FakeFlutterTestRunner(0);
+
+    final TestCommand testCommand = TestCommand(testRunner: testRunner);
+    final CommandRunner<void> commandRunner = createTestCommandRunner(testCommand);
+
+    await commandRunner.run(const <String>[
+      'test',
+      '--no-pub',
+    ]);
+
+    expect(
+      testRunner.lastReporterOption,
+      'github',
+    );
+  }, overrides: <Type, Generator>{
+    FileSystem: () => fs,
+    ProcessManager: () => FakeProcessManager.any(),
+    Platform: () => FakePlatform(
+      environment: <String, String>{
+        'GITHUB_ACTIONS': 'true',
+      },
+    ),
+    DeviceManager: () => _FakeDeviceManager(<Device>[
+      FakeDevice('ephemeral', 'ephemeral', type: PlatformType.android),
+    ]),
+  });
+
+  testUsingContext('Tests default to compact reporter if not specified and not on Github actions', () async {
+    final FakeFlutterTestRunner testRunner = FakeFlutterTestRunner(0);
+
+    final TestCommand testCommand = TestCommand(testRunner: testRunner);
+    final CommandRunner<void> commandRunner = createTestCommandRunner(testCommand);
+
+    await commandRunner.run(const <String>[
+      'test',
+      '--no-pub',
+    ]);
+
+    expect(
+      testRunner.lastReporterOption,
+      'compact',
+    );
+  }, overrides: <Type, Generator>{
+    FileSystem: () => fs,
+    ProcessManager: () => FakeProcessManager.any(),
+    Platform: () => FakePlatform(
+      environment: <String, String>{}
+    ),
+    DeviceManager: () => _FakeDeviceManager(<Device>[
+      FakeDevice('ephemeral', 'ephemeral', type: PlatformType.android),
+    ]),
+  });
+
   testUsingContext('Integration tests given flavor', () async {
     final FakeFlutterTestRunner testRunner = FakeFlutterTestRunner(0);
 
@@ -789,6 +844,7 @@ class FakeFlutterTestRunner implements FlutterTestRunner {
   Duration? leastRunTime;
   bool? lastEnableObservatoryValue;
   late DebuggingOptions lastDebuggingOptionsValue;
+  String? lastReporterOption;
 
   @override
   Future<int> runTests(
@@ -824,6 +880,7 @@ class FakeFlutterTestRunner implements FlutterTestRunner {
   }) async {
     lastEnableObservatoryValue = enableObservatory;
     lastDebuggingOptionsValue = debuggingOptions;
+    lastReporterOption = reporter;
 
     if (leastRunTime != null) {
       await Future<void>.delayed(leastRunTime!);