Hey I am testing Live Data value. When I am mocking it giving me null pointer expection.

internal fun handleDataResponse() {
        dataLiveData.postValue(true)
        currentDeviceTypeLiveData.postValue(true)
}

test

@Test
fun `handleDataResponse - Handle connection success `() {
    // STUBBING
    // EXECUTION
    viewModel.handleDataResponse()
    // VERIFICATION
    assertEquals(true, viewModel.dataLiveData.value)
    assertEquals(true, viewModel.currentDeviceTypeLiveData.value)
}

It would be better if you provide complete example including mock creation and stubbing. But anyway, if you want your mocked objects to behave as original objects you should either use

spyk

or stub method call with

callOriginal()

. Otherwise, mock will either fail or return

null

based on whether it is relaxed or not. So, make sure your stubbing block contains at least this:

every { viewModel.dataLiveData.postValue(any()) } answers { callOriginal() }

Then, based on your mock creation logic you might need to also stub

viewModel.dataLiveData

itself in order to stub

get/set

for live data