Package org.junit.contrib.java.lang.system

Class DisallowWriteToSystemErr

java.lang.Object

org.junit.contrib.java.lang.system.DisallowWriteToSystemErr

All Implemented Interfaces:

org.junit.rules.TestRule

public class DisallowWriteToSystemErr
extends java.lang.Object
implements org.junit.rules.TestRule

DisallowWriteToSystemErr lets a test fail if it tries to write something to System.err.

For that purpose you only have to add DisallowWriteToSystemErr rule to your test class

 public class TestClass {
   @Rule
   public final DisallowWriteToSystemErr disallowWriteToSystemErr
     = new DisallowWriteToSystemErr();

   @Test
   public void this_test_fails() {
     System.err.println("some text");
   }
 }
 

Since:

1.14.0

See Also:

DisallowWriteToSystemOut

Constructor Summary

Constructors

Constructor	Description
DisallowWriteToSystemErr()

Method Summary

Modifier and Type	Method	Description
org.junit.runners.model.Statement	apply(org.junit.runners.model.Statement base, org.junit.runner.Description description)

Methods inherited from class java.lang.Object

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

Constructor Detail

DisallowWriteToSystemErr

public DisallowWriteToSystemErr()

Method Detail

apply

public org.junit.runners.model.Statement apply(org.junit.runners.model.Statement base,
                                               org.junit.runner.Description description)

Specified by:

apply in interface org.junit.rules.TestRule