Hey folks, I'm using mockito to mock a viewmodel and then return certain values

@Mock
lateinit var viewModel: ImageListViewModel
...

`when`(viewModel.imageItems).thenReturn(listOf())

but doing this gives me an error:

java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.Object androidx.compose.runtime.State.getValue()' on a null object reference

where imageItems is

var imageItems: List<ImageItem> by mutableStateOf(listOf())
	private set

would anyone know what I'm doing wrong?