Fix `overriden_field` false positive (#246).

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 132 matching lines @@
               .main(['test/_data/p8', '-c', 'test/_data/p8/lintconfig.yaml']);
           expect(exitCode, 0);
           expect(
               collectingOut.trim(),
               stringContainsInOrder(
                   ['2 files analyzed, 0 issues found (1 filtered), in']));
         });
       });
     });
 
+    group('overridden_field', () {
+      IOSink currentOut = outSink;
+      CollectingSink collectingOut = new CollectingSink();
+      setUp(() {
+        exitCode = 0;
+        outSink = collectingOut;
+      });
+      tearDown(() {
+        collectingOut.buffer.clear();
+        outSink = currentOut;
+        exitCode = 0;
+      });
+
+      // https://github.com/dart-lang/linter/issues/246
+      test('overrides across libraries', () {
+        dartlint.main([
+          'test/_data/overridden_field',
+          '-c',
+          'test/_data/overridden_field/lintconfig.yaml'
+        ]);
+        expect(exitCode, 0);
+        expect(collectingOut.trim(),
+            stringContainsInOrder(['2 files analyzed, 0 issues found, in']));
+      });
+    });
+
     group('examples', () {
       test('lintconfig.yaml', () {
         var src = readFile('example/lintconfig.yaml');
         var config = new LintConfig.parse(src);
         expect(config.fileIncludes, unorderedEquals(['foo/**']));
         expect(
             config.fileExcludes, unorderedEquals(['**/_data.dart', 'test/**']));
         expect(config.ruleConfigs, hasLength(1));
         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 {}