I am writing a test class using JUnitParams and Mockito. I want to use a Mockito mock as parameter. In my test I have about ten mocks and I want to pass only one mock to define a special behaviour for it.
I reproduced the problem in a simple example.
My problem: I initialize the variable myList in the method parametersForTest, but when I debug into the test method myList is null, but param is my desired mock.
@RunWith(JUnitParamsRunner.class)
public class MockitoJUnitParamsTest {
private List myList;
@Test
@Parameters
public void test(List param) {
assertThat(param).isEqualTo(this.myList);
}
public Object[] parametersForTest() {
myList = Mockito.mock(List.class);
return new Object[]{myList};
}
}
I use
Why is myList null and how can I fix that?
The instance of the MockitoJUnitParamsTest class running parametersForTest() method is not the same running test(). This is because Junit will create a different instance for each test method. In your case , making myList static
private static List myList;
can solve the problem partially, but It may fail if the tests run in parallel.