Hi folks! Given the following classes: ```class Connector() { val scanObservers = mutableListO...

# mockk

[Mario Adam]

Hi folks!

Given the following classes:

class Connector() {
    val scanObservers = mutableListOf<(Scan) -> Unit>()
}

and

class ScanProcessorViewModel constructor(connector: Connector) {
    init {
        connector.scanObservers.add {
            someMethod()
        }
    }
}

I have started a unit test including following properties:

@RelaxedMockK
lateinit var connector: Connector

@SpyK
@InjectMockKs
lateinit var viewModel: ScanProcessorViewModel

How can I mock the scanObservers property and then verify that an entry has been added by the init block?

[Sam]

I’m not sure you need mocks here. What problems do you run into if you just use real instances?

[Mario Adam]

The code - of course - is snipped… The viewmodel for example has a few more stuff provided by its constructor. Mocking these is much more comfortable - given the fact that the concrete implementations are in another package (following onion architecture).

Of course - I could leave out the viewmodel property in my test and create it within my tests. This would make my connector able to be a concrete instance instead of a mock while the other stuff remains mocked.

[Mario Adam]

OK - I need to revert my comment above. I need to mock the connector as well, as this class has an init block as well which does some concrete system calls (precisely: broadcasting intents)