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https://issues.apache.org/jira/browse/FLINK-2480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14725551#comment-14725551
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ASF GitHub Bot commented on FLINK-2480:
---------------------------------------
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.
> Improving tests coverage for org.apache.flink.streaming.api
> -----------------------------------------------------------
>
> Key: FLINK-2480
> URL: https://issues.apache.org/jira/browse/FLINK-2480
> Project: Flink
> Issue Type: Test
> Components: Streaming
> Affects Versions: 0.10
> Reporter: Huang Wei
> Fix For: 0.10
>
> Original Estimate: 504h
> Remaining Estimate: 504h
>
> The streaming API is quite a bit newer than the other code so it is not that
> well covered with tests.
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