Mocking of non-interface beans not working

[ericathedev]

The mocking of non-interface beans not working using the latest micronautVersion 1.3.2 and micronaut-test-junit5:1.1.5. Could this be a reoccurance of https://github.com/micronaut-projects/micronaut-test/issues/20 which was fixed in 1.1?

To see the problem in action please look at the example project: https://github.com/ericathedev/test-kt. It uses Micronaut, Kotlin and JUnit5.

Running ClassWithInjectedFileTest#inject mock classToInject returns

expected: <mock> but was: <exampleMethodReturn>
org.opentest4j.AssertionFailedError: expected: <mock> but was: <exampleMethodReturn>

When mocking a class with an interface the test works, see ClassWithInjectedFileTest#inject mock classToInjectWithInterface.

Thank you in advance!

[simonsilvalauinger]

Hello everybody, I can confirm the bug. Using an interface instead of a non-interface bean @MockBean is working.

Regards Simon

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[balazsjuhasz-tsc]

We have experienced the same. Is there any plan to fix? Thanks

[alvarosanchez]

micronaut-projects/micronaut-test#20 was in fact incorrectly closed

[graemerocher]

Test seems to have passed on the CI?

[alvarosanchez]

It didn't run on CI as far as I can tell because I didn't create a PR.

They are running now: https://github.com/micronaut-projects/micronaut-test/pull/264

[vijamesDD]

Hi, we have found this issue as well, using micronaut core 2.2.3 and micronaut test 2.2.1. Is there any update on a fix please? Thanks

[jaecktec]

what the sample project is missing is:

allOpen {
	annotations("io.micronaut.aop.Around", "javax.inject.Singleton")
}

and mocking worked like this:

@get:MockBean(ClassToInject::class)
val mockClassToInject: ClassToInject = mockk()

would this fix your issue?

[ljoia]

what the sample project is missing is:

allOpen {
	annotations("io.micronaut.aop.Around", "javax.inject.Singleton")
}

and mocking worked like this:

@get:MockBean(ClassToInject::class)
val mockClassToInject: ClassToInject = mockk()

would this fix your issue?

The workaround actually fixed it for me (version 2.3.4)

This should be the default behavior, or at least be mentioned in the documentation

[sandroboehme]

I can confirm the issue. E.g. the "Mocking Collaborators" example for Kotest only works with the MathService interface and the MathServiceImp implementation. Unfortunately the provided workaround didn't work for me in this case.

[jacekgajek]

@sandroboehme

allOpen {
       annotations("jakarta.inject.Singleton")
}

worked for me (jakarta.inject instead of javax.inject, Around not required)

This definitely should be documented!

[jaecktec]

This should also be added to https://micronaut.io/launch

[ericsnx]

Is there an actual official solution to that? I know I can simply create an interface, but I try to do it for scenarios that are actually needed/justifiable.

[eddgrant]

Can confirm that it's still an issue in Micronaut 4.4.1 (which I'm using with with Mockk 1.13.10).

I have spent so many hours trying to get certain tests passing and have only just stumbled upon this, which immediately resolved the problem for me.

I think it would save much time and frustration for many people if this were clearly documented somewhere in the Micronaut docs.