Mocking dependencies in tests

TestExample.kt

@Test
internal fun presenceService_askedForFrequency() {
 val heartbeat = PublishSubject.create<Presence>()
 val mockPresenceService = mock<PresenceService> {
 on { sendHeartbeat() } doReturn heartbeat
 }
 val mockNetworkingModule = mock<NetworkingModule> {
 on { createSecureServiceEndpoint(PresenceService::class.java) }
 .doReturn(mockPresenceService)
 }
 val presenceMaintainer = PresenceMaintainer(mockNetworkingModule)
 heartbeat.onNext(Presence(1))
 presenceMaintainer.onActivityResumed(any())
 eventually { verify(mockPresenceService).sendHearbeat(true) }
}