I've a composable that takes as parameters several viewModels. I'm trying to androidTest said compos...

# compose-android

[Alexandru Gheorghe]

I've a composable that takes as parameters several viewModels. I'm trying to androidTest said composable. How can I instantiate real viewModels in my instrumentation tests?

[Alexandru Gheorghe]

Or is mocking the only solution?

[Pablichjenkov]

What is wrong with depending on an abstract ViewModel class and provide real vs tests implementations depending on the environment. Although this is not popular TBH

[Pablichjenkov]

Although you can also live the ViewModel as is and rather use fake in the ViewModel constructor dependecies. Aren't you able to do something like

class MyViewModel(
  dep1: Dependency1Intf,
  dep2: Dependency2Intf
)

fake1: Dependency1Intf = FakeDep1()
fake2: Dependency2Intf = FakeDep2()

MyViewModel(fake1, fake2)

[Alexandru Gheorghe]

I ended up mockking. Easiest way given that composables can't be used in instrumentation testing.

[Pablichjenkov]

Mocking is good, basically you can achieve good testing both ways mocking and faking.

[Atul Gupta]

Mocking is brittle though as your implementation gets complication you need to update the mocked values stubbed method so that they don't start returning null or giving NPEs