How to Mock System.getProperty using Mockito

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mocking system property

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);
when(system.getProperty("flag")).thenReturn("true");`

But I am getting the following exception:

org.mockito.exceptions.misusing.MissingMethodInvocationException: 
when() requires an argument which has to be 'a method call on a mock'.
For example:
    when(mock.getArticles()).thenReturn(articles);

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:

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

@After
public void tearDown() {
    System.clearProperty("flag");
}

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