Ignore exit-code of DRT and only trust stdout

tools/testing/dart/test_runner.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 executing tests.
  *
  * This module includes:
  * - Managing parallel execution of tests, including timeout checks.
  * - Evaluating the output of each test as pass/fail/crash/timeout.
@@ skipping 689 matching lines @@
       switch (line) {
         case 'Content-Type: text/plain':
           has_content_type = true;
           break;
         case 'PASS':
           if (has_content_type) {
             if (exitCode != 0) {
               print("Warning: All tests passed, but exitCode != 0 "
                     "(${testCase.displayName})");
             }
-            return (exitCode != 0 && !hasCrashed);
+            if (testCase.configuration['runtime'] == 'drt') {
+              // TODO(kustermann/ricow): Issue: 7563
+              // We should eventually get rid of this hack.
+              return false;
+            } else {
+              return (exitCode != 0 && !hasCrashed);
+            }
           }
           break;
       }
     }
     return true;
   }
 }
 
 // The static analyzer does not actually execute code, so
 // the criteria for success now depend on the text sent
@@ skipping 1009 matching lines @@
         // the developer doesn't waste his or her time trying to fix a bunch of
         // tests that appear to be broken but were actually just flakes that
         // didn't get retried because there had already been one failure.
         bool allowRetry = _MAX_FAILED_NO_RETRY > _progress.numFailedTests;
         new RunningProcess(test, allowRetry, this).start();
       }
       _numProcesses++;
     }
   }
 }