hi here, I am having a companion object, that declares a method annotated with `JvmStatic` I want to...

# getting-started

[Gasan]

hi here, I am having a companion object, that declares a method annotated with JvmStatic I want to write a junit/mockito test where I want to mock the method. Is there a way to do it? What if I remove JvmStatic ? What are my options?

I think it’s a part of the broader topic - how does the companion object relate to beans/singleton concepts of Spring, for example.

Ideally, I would want no static methods at all. But instead having a singleton-y classes that I could mock or do whatever I can with the normal classes.

[ephemient]

there is a #mockk channel fyi

[Gasan]

ah

[Gasan]

thanks

[ephemient]

but as for your question and edit: you want mockkObject on the companion object, and it does not relate

[ephemient]

if you use top-level functions (not contained within objects) then you can mockkStatic them

[ephemient]

https://mockk.io/#object-mocks
https://mockk.io/#extension-functions

[ephemient]

(which don't exactly describe your scenario, but are applicable)

[Gasan]

right, I will try that. My companion objects function is called from the java code. So the test resides also in the java code. I will try to work around it, thanks.

[ephemient]

mockito doesn't handle Kotlin all that well, even with mockito-kotlin. there isn't really a great way to mock Kotlin types from Java

[Gasan]

well, I guess if I remove JvmStatic, then there should be a way around. As it won’t be a static (from java point of view), so there should be a way to mock it. But then I would have to have it as a dependency.

[Gasan]

Righ, I guess the only real option to me is to declare this function object as an explicit dependency of my java class, so that I could inject a mocked object.

[Gasan]

That is actually what I meant by relation between companion objects and dependency injection frameworks. It looks to me like they try to achieve similar thing. Although di components are more explicit and thus versatile.

[Gasan]

I can also re-write my test to Kotlin 😄

[Gasan]

or try to at least

[Gasan]

but thanks for thinking together