uk.org.lidalia.test

Class SystemOutputRule

java.lang.Object

uk.org.lidalia.test.SystemOutputRule

All Implemented Interfaces:

TestRule

public class SystemOutputRule
extends Object
implements TestRule

A JUnit rule that facilitates testing code that prints to System.out or System.err.

At the start of each test the System.out and System.err PrintStreams are replaced with ones that buffer data passed to them in memory, allowing the test to retrieve the contents of the buffer at any time and assert on it. At the end of the test the original PrintStreams are restored allowing access to the console again.

Constructor Summary

Constructors

Constructor and Description
SystemOutputRule()

Method Summary

Methods

Modifier and Type	Method and Description
Statement	apply(Statement base, Description description)
String	getSystemErr()
String	getSystemOut()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SystemOutputRule

public SystemOutputRule()

Method Detail

apply

public Statement apply(Statement base,
              Description description)

Specified by:

apply in interface TestRule

getSystemOut

public String getSystemOut()

Returns:

the data that has been written to System.out since the test began

getSystemErr

public String getSystemErr()

Returns:

the data that has been written to System.err since the test began