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JUnit5 Mockito Extension: @InjectMocks seems to discard generic type

See original GitHub issue

Hello everybody, it seems that the Mockito JUnit 5 extension (@InjectMocks) does not properly work for generics. Declaring something like the following in a JUnit5 test:

@Mock(name = "mockA")
private GenericObjectContainer<String> mockA;
@Mock(name = "mockB")
private GenericObjectContainer<Integer> mockB;
@InjectMocks
private TestClass myTestObject; // has a constructor setting the distinct fields

leads to only mockA being injected into myTestObject which is expected to receive mockA and mockB, which makes it impossible to apply distinct when-mock-behaviour for a whitebox test. A workaround is to define the mocks the old-fashioned way using Mockito.mock(...) and creating the test object myself via new TestClass(mockA, mockB).

I’ve created a project that reproduces the problem: Mockito Junit5 Generics Bug.

Can anyone confirm that this really is a bug?

Issue Analytics

State:
Created 2 years ago
Reactions:1
Comments:5 (2 by maintainers)

Top GitHub Comments

1reaction

LeMikaelFcommented, Aug 29, 2021

The link to your project is broken, and I wasn’t able to reproduce it (gist)…

0reactions

SaltySunlightcommented, Aug 31, 2021

Thanks for the detailed comment @LeMikaelF ! I personally fully understand the MockitoExtension and its related annotations do not need to work as a fully-fledge CDI framework like Spring provides. As the documenation is clear on this and it is still easily possible to create a test object with mocked dependencies, I’m closing this issue. All the best to you - Mockito is really nice! 😃

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