Use ansi color in the dartanalyzer cli output.

pkg/analyzer_cli/test/reporter_test.dart

Index: pkg/analyzer_cli/test/reporter_test.dart
diff --git a/pkg/analyzer_cli/test/reporter_test.dart b/pkg/analyzer_cli/test/reporter_test.dart
index 078f36da05fb46034dded2c145017cdab550084f..4fab7bd25ae74bec2cd585bd1d3249737507275a 100644
--- a/pkg/analyzer_cli/test/reporter_test.dart
+++ b/pkg/analyzer_cli/test/reporter_test.dart
@@ -5,6 +5,7 @@
 library analyzer_cli.test.formatter;
 
 import 'package:analyzer/analyzer.dart';
+import 'package:analyzer_cli/src/ansi.dart' as ansi;
 import 'package:analyzer_cli/src/error_formatter.dart';
 import 'package:test/test.dart' hide ErrorFormatter;
 import 'package:typed_mock/typed_mock.dart';
@@ -16,8 +17,15 @@ main() {
     var out = new StringBuffer();
     var stats = new AnalysisStats();
 
-    setUp(() => stats.init());
-    tearDown(() => out.clear());
+    setUp(() {
+      ansi.runningTests = true;
+      stats.init();
+    });
+
+    tearDown(() {
+      out.clear();
+      ansi.runningTests = false;
+    });
 
     // Options
     var options = new MockCommandLineOptions();
@@ -33,7 +41,7 @@ main() {
       reporter.formatErrors([error]);
 
       expect(out.toString().trim(),
-          '[error] MSG at /foo/bar/baz.dart:3:3 (mock_code).');
+          'error • MSG at /foo/bar/baz.dart:3:3 • mock_code');
     });
 
     test('hint', () {
@@ -41,7 +49,7 @@ main() {
       reporter.formatErrors([error]);
 
       expect(out.toString().trim(),
-          '[hint] MSG at /foo/bar/baz.dart:3:3 (mock_code).');
+          'hint • MSG at /foo/bar/baz.dart:3:3 • mock_code');
     });
 
     test('stats', () {
@@ -50,7 +58,7 @@ main() {
       stats.print(out);
       expect(
           out.toString().trim(),
-          '[hint] MSG at /foo/bar/baz.dart:3:3 (mock_code).\n'
+          'hint • MSG at /foo/bar/baz.dart:3:3 • mock_code\n'
           '1 hint found.');
     });
   });