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Id
12233390
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0
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CreationDate
2012-09-02T04:25:52.820
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2012-09-02T06:07:04.387
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2012-09-02T06:07:04.387
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1272477
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1119385
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2
Score
7
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text
Body
@dfa answer is great, so I took it a step farther to make it possible to test blocks of ouput. First I created <code>TestHelper</code> with a method <code>captureOutput</code> that accepts the annoymous class <code>CaptureTest</code>. The captureOutput method does the work of setting and tearing down the output streams. When the implementation of <code>CaptureOutput</code>'s <code>test</code> method is called, it has access to the output generate for the test block. Source for TestHelper: <pre><code>public class TestHelper { public static void captureOutput( CaptureTest test ) throws Exception { ByteArrayOutputStream outContent = new ByteArrayOutputStream(); ByteArrayOutputStream errContent = new ByteArrayOutputStream(); System.setOut(new PrintStream(outContent)); System.setErr(new PrintStream(errContent)); test.test( outContent, errContent ); System.setOut(new PrintStream(new FileOutputStream(FileDescriptor.out))); System.setErr(new PrintStream(new FileOutputStream(FileDescriptor.out))); } } abstract class CaptureTest { public abstract void test( ByteArrayOutputStream outContent, ByteArrayOutputStream errContent ) throws Exception; } </code></pre> Note that TestHelper and CaptureTest are defined in the same file. Then in your test, you can import the static captureOutput. Here is an example using JUnit: <pre><code>// imports for junit import static package.to.TestHelper.*; public class SimpleTest { @Test public void testOutput() throws Exception { captureOutput( new CaptureTest() { @Override public void test(ByteArrayOutputStream outContent, ByteArrayOutputStream errContent) throws Exception { // code that writes to System.out assertEquals( "the expected output\n", outContent.toString() ); } }); } </code></pre>
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