Hi, Does anyone here have experience or relevant resources for mocking dagger related dependencies while unit testing in a multi-module clean architecture-based project? Kinda stuck with it here. 😅

What are you stuck with?

So I have created a testing app component, but I am unable to inject the classes in my test file.

what kind of test are you writing?

I am trying to test the ViewModels

For unit tests just construct the class in test manually. See the last section here: https://dagger.dev/dev-guide/testing.html

But I have a lot of dependencies, it will be difficult to manually create each of them.

Ok, I recommend read the whole article instead of just the last section.

I was actually following the Option 2 that is mentioned there, but despite the dependency graph for Test App Component was generated, it couldn’t be injected. I am not using Hilt, Just dagger android.

Hmm, you mention multi-module project, are you trying to inject fakes or other shared test classes (like test data) from another module, or just using plain mockito?

Not trying to fake other test classes as of now.

So I don't know why its not in the docs or not recommended or w/e but I usually just do a standalone component for a specific test, works great with dagger android because a subcomponent implementation is specific to the enclosing component. plus then the graph validation is only on the parts of the graph you need for the test.

@Component(modules = [WhateverYouWantOrNeedModule::class])
interface TheTestComponent {
  val theViewModelToTest: SomeViewModel
  val somethingYouCheckToValidateOrConfigure: SomethingViewModelDependsOn
}

Generally you shouldn't need to do anything w/ dagger/di in your unit tests, thats the point of DI

It took me a while, but I finally understood. Thank you! 🙌