Fix analyzer tests when run in checked mode.

pkg/analyzer_cli/test/reporter_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.
 
 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;
@@ skipping 15 matching lines @@
       out.clear();
       ansi.runningTests = false;
     });
 
     // Options
     var options = new MockCommandLineOptions();
     when(options.enableTypeChecks).thenReturn(false);
     when(options.hintsAreFatal).thenReturn(false);
     when(options.machineFormat).thenReturn(false);
     when(options.verbose).thenReturn(false);
+    when(options.color).thenReturn(false);
 
     var reporter = new ErrorFormatter(out, options, stats);
 
     test('error', () {
       var error = mockError(ErrorType.SYNTACTIC_ERROR, ErrorSeverity.ERROR);
       reporter.formatErrors([error]);
 
       expect(out.toString().trim(),
           'error • MSG at /foo/bar/baz.dart:3:3 • mock_code');
     });
@@ skipping 36 matching lines @@
   when(code.name).thenReturn('mock_code');
   when(error.errorCode).thenReturn(code);
   when(error.message).thenReturn('MSG');
   var source = new MockSource();
   when(source.fullName).thenReturn('/foo/bar/baz.dart');
   when(error.source).thenReturn(source);
   when(info.errors).thenReturn([error]);
 
   return info;
 }