Fix for default filter (#228).

test/integration_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 linter.test.integration;
 
 import 'dart:convert';
 import 'dart:io';
 
 import 'package:linter/src/config.dart';
@@ skipping 35 matching lines @@
               stringContainsInOrder(
                   ['4 files analyzed, 1 issue found (2 filtered), in']));
         });
         test('overrrides', () {
           dartlint
               .main(['test/_data/p2', '-c', 'test/_data/p2/lintconfig2.yaml']);
           expect(exitCode, 0);
           expect(collectingOut.trim(),
               stringContainsInOrder(['4 files analyzed, 0 issues found, in']));
         });
+        test('default', () {
+          dartlint.main(['test/_data/p2']);
+          expect(exitCode, 1);
+          expect(collectingOut.trim(),
+              stringContainsInOrder(['4 files analyzed, 3 issues found, in']));
+        });
       });
     });
     group('p3', () {
       IOSink currentOut = outSink;
       CollectingSink collectingOut = new CollectingSink();
       setUp(() => outSink = collectingOut);
       tearDown(() {
         collectingOut.buffer.clear();
         outSink = currentOut;
       });
@@ skipping 89 matching lines @@
         var ruleConfig = config.ruleConfigs[0];
         expect(ruleConfig.group, 'style_guide');
         expect(ruleConfig.name, 'unnecessary_getters');
         expect(ruleConfig.args, {'enabled': false});
       });
     });
   });
 }
 
 class MockProcessResult extends Mock implements ProcessResult {}