How to Mock System.getProperty using Mockito

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I have added mock-maker-inline text in org.mockito.plugins.MockMaker file and placed it in test/resources/mockito-extensions

In my test case I am using:

System system = mock(System.class);

But I am getting the following exception:

when() requires an argument which has to be 'a method call on a mock'.
For example:

Also, this error might show up because:
1. you stub either of: final/private/equals()/hashCode() methods.
   Those methods *cannot* be stubbed/verified.
   Mocking methods declared on non-public parent classes is not supported.
2. inside when() you don't call method on mock but on some other object.

Appreciate any suggestions

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Your could also use real methods, preparing and removing the configuration before and after each test:

public void setUp() {
    System.setProperty("flag", "true");

public void tearDown() {

Mock System class with Mockito + PowerMock, In this post, I am going to show how to mock the System.getenv and System. getProperty methods. I have used Mockito and PowerMock to do� Understood. Where can I find this list? The eventual goal was to mock out System.getenv() for which you cannot simply set the properties without some nasty reflection. As far as using System.setProperty(), I could respond with "why not use Mockito/PowerMock". Sometimes the alternative is not sufficient. – Dave Nov 5 '14 at 0:32

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