Mock constructor with mockito

Question

I want to mock a constructor into method.

public String generaID() {   
    GeneraIDParaEntidadCliente aux = new GeneraIDParaEntidadCliente(nombre, registro);   
    entidad.setID(aux.generaID);   
}

In my test I want do something like this :

when(new GeneraIDParaEntidadCliente(anyString(), any(Entidad.class)).thenReturn(generaIdMock)

but give me this error org.mockito.exceptions.misusing.InvalidUseOfMatchersException:

Any idea why?

possible duplicate of [Unit testing with mockito for constructors](http://stackoverflow.com/questions/11214136/unit-testing-with-mockito-for-constructors) — Sean Patrick Floyd, Nov 29 '13 at 12:54
but this solution doesn´t works for me, I don´t want to parametrice method. — Mathew Rock, Nov 29 '13 at 13:10

score 7 · Accepted Answer · edited Nov 07 '22 at 17:25

7

UPDATE: since since version 3.5.0, Mockito can do this without PowerMockito.

You can use PowerMock to mock constructors.

If you can't use PowerMock for some reason, the most workable solution is to inject a factory to whatever class contains this method. You would then use the factory to create your GeneraIDParaEntidadCliente object and mock the factory.

edited Nov 07 '22 at 17:25

tkruse

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answered Nov 29 '13 at 13:33

Dave

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I tried whith org.powermock.api.mockito.PowerMockito.whenNewnew(GeneraIDParaEntidadCliente(String.class, Entidad.class).thenReturn(generaIdMock) But doesn´t work. Any idea why? – Mathew Rock Dec 02 '13 at 07:58
I'd have to see more of your code to know exactly what's wrong. Are you using @RunWith(PowerMockRunner.class) and @PrepareForTest on the test class? See [here](http://code.google.com/p/powermock/wiki/MockitoUsage13). – Dave Dec 03 '13 at 02:26
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@RunWith(PowerMockRunner.class) and @PrepareForTest({GeneraIDParaEntidadCliente .class}) – Mathew Rock Dec 03 '13 at 12:53

score 0 · Answer 2 · answered Nov 30 '13 at 00:56

0

There are a couple of ways of doing this, described in my article on the Mockito wiki

answered Nov 30 '13 at 00:56

Dawood ibn Kareem

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ha ha ... instead of providing solution ... they are telling to change the code itself – Shashi Ranjan Sep 29 '16 at 10:01

score 0 · Answer 3 · answered Nov 07 '22 at 17:23

Copying answer from duplicate: Mockito can now mock constructors (since version 3.5.0) https://javadoc.io/static/org.mockito/mockito-core/3.5.13/org/mockito/Mockito.html#mocked_construction

try (MockedConstruction mocked = mockConstruction(Foo.class)) {
   Foo foo = new Foo();
   when(foo.method()).thenReturn("bar");
   assertEquals("bar", foo.method());
   verify(foo).method();
 }

score -1 · Answer 4 · answered Oct 20 '16 at 08:06

you can send mocked objects as paramemters to your class constructor, form example:

// define you object
public MainClassObj instanceClass;

// mock input parameter
MYClassObj mockedObj = Mockito.mock(MYClassObj.class);

// call construvtor with mocked parameter
instanceClass = new instanceClass(mockedObj);

Mock constructor with mockito

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