MockK - Failed matching mocking signature for left matchers: [any(), any()]

Issue

I want to implement some UI Tests to assure that the code implemented today works for tomorrow but when trying to see if already UI tests implemented in the past works, it throws this error:

Caused by: io.mockk.MockKException: Failed matching mocking signature for left matchers: [any(), any()]

This happens on an every {} return Unit line which there's a object file called WakeUpTimeManager, that calls a .set(param1, param2) function and inside that function there are some inline functions which I think it could be causing the problem but I don't know. I tried searching on the internet but couldn't find a solution.

Here's the test that throws the error:

  @Before
  fun setup() {
    mockkObject(WakeUpTimerManager)
    every { WakeUpTimerManager.set(any(), any()) } returns Unit
  }

Here's the function that is calling on every line

  fun set(context: Context, timer: Timer) {
    if (timer.atMillis < System.currentTimeMillis()) {
      return
    }

    if (Preset.findByID(context, timer.presetID) == null) {
      return
    }

    //This is an inline function
    withGson {
      PreferenceManager.getDefaultSharedPreferences(context).edit {
        putString(PREF_WAKE_UP_TIMER, it.toJson(timer))
      }
    }

    //This is an inline function
    withAlarmManager(context) {
      it.setAlarmClock(
        AlarmManager.AlarmClockInfo(timer.atMillis, getPendingIntentForActivity(context)),
        getPendingIntentForService(context, timer)
      )
    }
  }

Question: Why does mockk throw this error? What's going on? Is there any solution for this?

Solution

try with mockkStatic(WakeUpTimerManager::class). For me mockkObject was not working either, but mockkStatic did

Answered By - M. Wojcik