instrumentation tests - actual test cases

MainActivityTest.kt

@UninstallModules(APIModule::class, OtherModule::class)
@HiltAndroidTest
class MainActivityTest {

    @get:Rule
    var hiltRule = HiltAndroidRule(this)

    @Rule
    @JvmField
    val activityRule = ActivityTestRule(MainActivity::class.java, true, false)

    private lateinit var mockServer: MockWebServer

    @Before
    fun setUp() {
        mockServer = MockWebServer()
        mockServer.start(8080)
    }

    @After
    fun tearDown() =
        mockServer.shutdown()

    @Test
    fun happyTestCase() {
        mockServer.dispatcher = object : Dispatcher() {
            override fun dispatch(request: RecordedRequest): MockResponse {
                return MockResponse()
                    .setResponseCode(200)
                    .setBody(FileReader.readStringFromFile("success_response.json"))
            }
        }
        activityRule.launchActivity(null)
        Espresso.onView(withId(R.id.progress_bar)).run {
            check(ViewAssertions.matches(not(ViewMatchers.isDisplayed())))
        }
        Espresso.onView(withId(R.id.repo_recycler_view)).run {
            check(ViewAssertions.matches(ViewMatchers.isDisplayed()))
        }
    }

    @Test
    fun unHappyTestCase() {
        mockServer.dispatcher = object : Dispatcher() {
            override fun dispatch(request: RecordedRequest): MockResponse {
                return MockResponse().throttleBody(1024, 5, TimeUnit.SECONDS)
            }
        }
        activityRule.launchActivity(null)
        Espresso.onView(withId(R.id.retry_btn)).run {
            check(ViewAssertions.matches(ViewMatchers.withEffectiveVisibility(ViewMatchers.Visibility.VISIBLE)))
        }
    }
}