Oops.

tools/testing/dart/test_suite.dart

 // Copyright (c) 2012, 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.
 
 /**
  * Classes and methods for enumerating and preparing tests.
  *
  * This library includes:
  *
  * - Creating tests by listing all the Dart files in certain directories,
@@ skipping 246 matching lines @@
   }
 
   /**
    * The default implementation assumes a file is a test if
    * it ends in "Test.dart".
    */
   bool isTestFile(String filename) {
     // Use the specified predicate, if provided.
     if (isTestFilePredicate != null) return isTestFilePredicate(filename);
 
-    filename.endsWith("Test.dart");
+    return filename.endsWith("Test.dart");
   }
 
   bool listRecursively() => false;
 
   String shellPath() => TestUtils.dartShellFileName(configuration);
 
   List<String> additionalOptions(String filename) => [];
 
   void forEachTest(Function onTest, Map testCache, String globalTempDir(),
                    [Function onDone = null]) {
@@ skipping 100 matching lines @@
         }
       }
     }
     int shards = configuration['shards'];
     if (shards > 1) {
       int shard = configuration['shard'];
       if (testName.hashCode() % shards != shard - 1) {
         return;
       }
     }
-    
+
     Set<String> expectations = testExpectations.expectations(testName);
     if (configuration['report']) {
       // Tests with multiple VMOptions are counted more than once.
       for (var dummy in optionsFromFile["vmOptions"]) {
         SummaryReport.add(expectations);
       }
     }
     if (expectations.contains(SKIP)) return;
 
     if (TestUtils.isBrowserRuntime(configuration['runtime'])) {
@@ skipping 891 matching lines @@
  * $noCrash tests are expected to be flaky but not crash
  * $pass tests are expected to pass
  * $failOk tests are expected to fail that we won't fix
  * $fail tests are expected to fail that we should fix
  * $crash tests are expected to crash that we should fix
  * $timeout tests are allowed to timeout
 """;
     print(report);
    }
 }