test(e2e): add e2e test for licenses check

.github/workflows/e2e.yaml

@@ -47,6 +47,10 @@ jobs:
           - test/commands/create/flutter_package/flutter_pkg_test.dart
           - test/commands/create/flutter_plugin/flutter_plugin_test.dart
 
+          # E2E tests for the `packages check licenses` command
+          - test/commands/packages/check/licenses/licenses_allowed_test.dart
+          - test/commands/packages/check/licenses/licenses_forbidden_test.dart
+
     steps:
       - name: 📚 Git Checkout
         uses: actions/checkout@v4

e2e/test/commands/packages/check/licenses/licenses_allowed_test.dart

@@ -0,0 +1,60 @@
+import 'dart:io';
+
+import 'package:mason/mason.dart';
+import 'package:path/path.dart' as path;
+import 'package:test/test.dart';
+
+import '../../../../../helpers/helpers.dart';
+
+/// Objectives:
+///
+/// * Generate a new Dart project using (`dart create`)
+/// * Add dependencies to `pubspec.yaml` with an MIT license
+/// * Run `very_good packages check licenses --allowed="MIT"` and expect success
+void main() {
+  test(
+    'packages check licenses --allowed="MIT"',
+    timeout: const Timeout(Duration(minutes: 2)),
+    withRunner((commandRunner, logger, updater, logs) async {
+      final tempDirectory = Directory.systemTemp.createTempSync();
+      addTearDown(() => tempDirectory.deleteSync(recursive: true));
+
+      const projectName = 'my_dart_project';
+      await expectSuccessfulProcessResult(
+        'dart',
+        ['create', 'my_dart_project', '--no-pub'],
+        workingDirectory: tempDirectory.path,
+      );
+      final projectPath = path.join(tempDirectory.path, projectName);
+      await expectSuccessfulProcessResult(
+        'dart',
+        ['pub', 'add', 'formz'],
+        workingDirectory: projectPath,
+      );
+      await expectSuccessfulProcessResult(
+        'dart',
+        ['pub', 'get'],
+        workingDirectory: projectPath,
+      );
+
+      final relativeProjectPath = path.relative(
+        projectPath,
+        from: Directory.current.path,
+      );
+      final resultAllowed = await commandRunner.run(
+        [
+          'packages',
+          'check',
+          'licenses',
+          '--allowed=MIT',
+          relativeProjectPath,
+        ],
+      );
+      expect(
+        resultAllowed,
+        equals(ExitCode.success.code),
+        reason: 'Should succeed when allowed licenses are used',
+      );
+    }),
+  );
+}

e2e/test/commands/packages/check/licenses/licenses_forbidden_test.dart

@@ -0,0 +1,62 @@
+import 'dart:io';
+
+import 'package:mason/mason.dart';
+import 'package:path/path.dart' as path;
+import 'package:test/test.dart';
+
+import '../../../../../helpers/helpers.dart';
+
+/// Objectives:
+///
+/// * Generate a new Dart project using (`dart create`)
+/// * Add dependencies to `pubspec.yaml` with an MIT license
+/// * Run `very_good packages check licenses --forbidden="MIT"` and expect
+/// failure
+void main() {
+  test(
+    'packages check licenses --forbidden="MIT"',
+    timeout: const Timeout(Duration(minutes: 2)),
+    withRunner((commandRunner, logger, updater, logs) async {
+      final tempDirectory = Directory.systemTemp.createTempSync();
+      addTearDown(() => tempDirectory.deleteSync(recursive: true));
+
+      const projectName = 'my_dart_project';
+      await expectSuccessfulProcessResult(
+        'dart',
+        ['create', 'my_dart_project', '--no-pub'],
+        workingDirectory: tempDirectory.path,
+      );
+      final projectPath = path.join(tempDirectory.path, projectName);
+      await expectSuccessfulProcessResult(
+        'dart',
+        ['pub', 'add', 'formz'],
+        workingDirectory: projectPath,
+      );
+      await expectSuccessfulProcessResult(
+        'dart',
+        ['pub', 'get'],
+        workingDirectory: projectPath,
+      );
+
+      final relativeProjectPath = path.relative(
+        projectPath,
+        from: Directory.current.path,
+      );
+
+      final resultForbidden = await commandRunner.run(
+        [
+          'packages',
+          'check',
+          'licenses',
+          '--forbidden=MIT',
+          relativeProjectPath,
+        ],
+      );
+      expect(
+        resultForbidden,
+        equals(ExitCode.config.code),
+        reason: 'Should fail when forbidden licenses are used',
+      );
+    }),
+  );
+}