anchor.diff:          });
         });
       });
  -    asyncTestStarted();
     }
   
     // Test for file read and write functionality.
     static void testOutputStreamWriteString() {
  +    asyncTestStarted();
       String content = "foobar";
       String filename = tempDirectory.path + "/outstream_write_string";
       File file = new File(filename);
  
positive.code:         });
        });
      });
      asyncTestStarted();
    }
  
    static void testAppendSync() {
  
negative.code:         });
        });
      });
    }
  
    static void testTruncateSync() {
  