How can I mock constructor with varargs using PowerMockito?

Question

I have a bean:

class Bean {
    public Bean(String name, Integer number, Resource... resources ) {
        // ...
    }
}

I want to mock constructor of the bean. Here is my test:

@Test
public void shouldReturnMockedBean() throws Exception {
        PowerMockito.whenNew(Bean.class)
                .withArguments(
                        Mockito.anyString(),
                        Mockito.anyInt(),
                        Mockito.<Resource>anyVararg()
                ).thenReturn(beanMock);

        Bean bean = new Bean("abc", 1);

        Assert.assertNotNull(bean);
}

I also use PowerMockito annotation in my test class:

@RunWith(PowerMockRunner.class)
@PrepareForTest({Bean.class})

But I get an error a null instead of my mock. What I'm doing wrong here?

http://stackoverflow.com/questions/2631596/how-to-properly-match-varargs-in-mockito — Darshan Mehta, Mar 05 '16 at 23:17
In your question, can you please put a comment on the line of code that has the error? — 4castle, Mar 05 '16 at 23:39

score 2 · Accepted Answer · edited May 23 '17 at 12:07

2

The varargs is getting set to null instead of creating a varargs where the first element is null.

To fix it, do Bean bean = new Bean("abc", 1, (Resource)null);

See this

If you meant to provide no Resources, however, then just omit the 3rd parameter.

edited May 23 '17 at 12:07

Community

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answered Mar 05 '16 at 23:19

4castle

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I need to test constructor `new Bean("abc", 1)` where varargs in empty. – AlexWei Mar 05 '16 at 23:28
Do you still get the error when you do the constructor that way? – 4castle Mar 05 '16 at 23:32
No, if i leave it, test will pass. – AlexWei Mar 06 '16 at 00:57
Great! There's your solution then :) – 4castle Mar 06 '16 at 01:09

How can I mock constructor with varargs using PowerMockito?

1 Answers1