`analyzer_cli` move to SDK.

pkg/analyzer_cli/test/super_mixin_test.dart

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+@TestOn("vm")
+library analyzer_cli.test.super_mixin;
+
+import 'dart:io';
+
+import 'package:analyzer_cli/src/driver.dart' show Driver, errorSink, outSink;
+import 'package:path/path.dart' as path;
+import 'package:test/test.dart';
+
+import 'utils.dart';
+
+/// End-to-end test for --supermixins.
+///
+/// Most super mixin tests are in Analyzer, but this verifies the option is
+/// working and producing extra errors as expected.
+///
+/// Generally we don't want a lot of cases here as it requires spinning up a
+/// full analysis context.
+void main() {
+  group('--supermixins', () {
+    StringSink savedOutSink, savedErrorSink;
+    int savedExitCode;
+    setUp(() {
+      savedOutSink = outSink;
+      savedErrorSink = errorSink;
+      savedExitCode = exitCode;
+      outSink = new StringBuffer();
+      errorSink = new StringBuffer();
+    });
+    tearDown(() {
+      outSink = savedOutSink;
+      errorSink = savedErrorSink;
+      exitCode = savedExitCode;
+    });
+
+    test('produces errors when option absent', () async {
+      var testPath = path.join(testDirectory, 'data/super_mixin_example.dart');
+      new Driver().start([testPath]);
+
+      expect(exitCode, 3);
+      var stdout = outSink.toString();
+      expect(
+          stdout,
+          contains(
+              "[error] The class 'C' cannot be used as a mixin because it extends a class other than Object"));
+      expect(
+          stdout,
+          contains(
+              "[error] The class 'C' cannot be used as a mixin because it references 'super'"));
+      expect(stdout, contains('2 errors found.'));
+      expect(errorSink.toString(), '');
+    });
+
+    test('produces no errors when option present', () async {
+      var testPath = path.join(testDirectory, 'data/super_mixin_example.dart');
+      new Driver().start(['--supermixin', testPath]);
+
+      expect(exitCode, 0);
+      var stdout = outSink.toString();
+      expect(stdout, contains('No issues found'));
+    });
+  });
+}