Github user mxm commented on the pull request:
https://github.com/apache/flink/pull/1073#issuecomment-136758616
@HuangWHWHW Stephan is talking about something like this instead of the
PrintStreamMock:
```java
ByteArrayOutputStream baos = new ByteArrayOutputStream();
PrintStream captureStream = new PrintStream(baos);
PrintStream original = System.out;
System.setOut(captureStream);
System.out.println("Printing one line");
System.out.println("Another line");
System.setOut(original);
captureStream.close();
Assert.equals("Printing one line\nAnotherline\n", baos.toString());
```
You can see that we're using a `PrintStream` with a `ByteArrayOutputStream`
here to capture the contents that are being printed to standard out.
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