org.junit.contrib.java.lang.system
Class EnvironmentVariables

java.lang.Object
  org.junit.contrib.java.lang.system.EnvironmentVariables

All Implemented Interfaces:

org.junit.rules.TestRule

public class EnvironmentVariables
extends Object
implements org.junit.rules.TestRule

The EnvironmentVariables rule allows you to set environment variables for your test. All changes to environment variables are reverted after the test.

 public class EnvironmentVariablesTest {
   @Rule
   public final EnvironmentVariables environmentVariables = new EnvironmentVariables();

   @Test
   public void test() {
     environmentVariables.set("name", "value");
     assertEquals("value", System.getenv("name"));
   }
 }
 

Common variables can be set directly after creating the rule

 public class EnvironmentVariablesTest {
   @Rule
   public final EnvironmentVariables environmentVariables = new EnvironmentVariables()
       .set("name", "value");

   @Test
   public void test() {
     assertEquals("value", System.getenv("name"));
   }
 }
 

You can ensure that some environment variables are not set by calling clear(String...).

Warning: This rule uses reflection for modifying internals of the environment variables map. It fails if your SecurityManager forbids such modifications.

Constructor Summary

EnvironmentVariables()

Method Summary

org.junit.runners.model.Statement	apply(org.junit.runners.model.Statement base, org.junit.runner.Description description)
EnvironmentVariables	clear(String... names) Delete multiple environment variables.
EnvironmentVariables	set(String name, String value) Set the value of an environment variable.

Methods inherited from class java.lang.Object

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

Constructor Detail

EnvironmentVariables

public EnvironmentVariables()

Method Detail

set

public EnvironmentVariables set(String name,
                                String value)

Set the value of an environment variable.

Parameters:

name - the environment variable's name.

value - the environment variable's new value. May be null.

Returns:

the rule itself.

clear

public EnvironmentVariables clear(String... names)

Delete multiple environment variables.

Parameters:

names - the environment variables' names.

Returns:

the rule itself.

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