How can I pass mock object in data provider, using Mockito TestNG?

Question

I am trying to pass a mock object to test method through data provider. Below is my test class:

@Test
public class FirstTest {
@InjectMocks
First firstSpy;

@Mock
Second secondMock;

@Mock
Third thirdMock;

@BeforeMethod
public void beforeMethod() {
    firstSpy = Mockito.spy(new First());
    MockitoAnnotations.initMocks(this);

}

@DataProvider
private final Object[][] serviceData() {
    return new Object [][] {
        {thirdMock, 1},
        {null, 2}
    };
}

@Test(dataProvider="serviceData")
public void m1(Third thirdObject, int noOfTimesm3Called) {
  Mockito.doReturn(secondMock).when(firstSpy).m4();
  Mockito.doReturn(thirdObject).when(secondMock).m2();
  firstSpy.m1();
  verify(firstSpy, times(noOfTimesm3Called)).m3();
}
}

However, when I run this, it displays

PASSED: m1(null, 2)
FAILED: m1(null, 1)

which means both times a null object is passed. What is the reason behind this? And how can I get the desired behavior? I want to avoid any if-else statements in the test method, and want to test both cases in the same method using data provider. Is there a way for it?

score 3 · Accepted Answer · answered Oct 06 '15 at 03:56

3

Testng is calling methods in this specific order: serviceData, beforeMethod and m1.

If you want to pass a mock with a data provider, you have to create it before or into the data provider method.

answered Oct 06 '15 at 03:56

juherr

5,640
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Thanks! Shifting MockitoAnnotations.initMocks(this); to serviceData solved it. – Caesar Oct 06 '15 at 04:37

score 3 · Answer 2 · edited Aug 23 '18 at 19:44

3

You also can use @BeforeTest method, that is run before @DataProvider method. Since @BeforeTest is performed before, the @DataProvider method is able to use the mocks.

@BeforeTest is not to be confused with @BeforeMethod. See What is the difference between BeforeTest and BeforeMethod in TestNG.

edited Aug 23 '18 at 19:44

boltup_im_coding

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answered Nov 24 '17 at 21:09

androberz

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1

@boltup_im_coding could you clarify what is incorrect? It works for me at least for the testng-6.9.12.jar. If I initializing mock in the '@BeforeTest', I'm able to return it via '@DataProvider'. – androberz Aug 16 '18 at 14:55
@boltup_im_coding what about removing the vote down? :) Thanks. – androberz Aug 18 '18 at 15:05

How can I pass mock object in data provider, using Mockito TestNG?

2 Answers2