aqua30

@RunWith(AndroidJUnit4::class)  // To indicate that we've to run it with AndroidJUnit runner
class CounterDisplayKtTest {

    @get: Rule
    val composeTestRule = createComposeRule()   // compose rule is required to get access to the composable component

    @Before
    fun setUp() {
        composeTestRule.setContent {    // setting our composable as content for test
            ApiTestingTheme {

aqua30

@Composable
fun CounterDisplay(
    modifier: Modifier
) {

    var editedText by remember {
        mutableStateOf("")
    }

    var counterText by remember {

aqua30

@file:OptIn(ExperimentalCoroutinesApi::class)

class UserRepositoryImplTest {

    private lateinit var repository: UserRepository
    private lateinit var testApis: TestApis
    private lateinit var mockWebServer: MockWebServer

    @Before
    fun setUp() {

aqua30

@Test
fun `for user id not available, api must return with http code 404 and null user object`() = runTest {
    val expectedResponse = MockResponse()
        .setResponseCode(HttpURLConnection.HTTP_NOT_FOUND)
    mockWebServer.enqueue(expectedResponse)

    val actualResponse = repository.getUserById(1)
    assertThat(actualResponse.httpCode).isEqualTo(HttpURLConnection.HTTP_NOT_FOUND)
    assertThat(actualResponse.body).isNull()
}

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@Test
fun `for multiple users, api must return all users with http code 200`() = runTest {
   val users = listOf(
        User(1,"Saurabh","Delhi","India"),
        User(2,"Zergain","London","UK"),
   )
   val expectedResponse = MockResponse()
        .setResponseCode(HttpURLConnection.HTTP_OK)
        .setBody(Gson().toJson(users))
   mockWebServer.enqueue(expectedResponse)

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private lateinit var repository: UserRepository
private lateinit var testApis: TestApis
private lateinit var mockWebServer: MockWebServer

@Before
fun setUp() {
    mockWebServer = MockWebServer()
    mockWebServer.start()
    testApis = RetrofitHelper.testApiInstance(mockWebServer.url("/").toString())
    repository = UserRepositoryImpl(testApis)

aqua30

dependencies {

    ... other suppport dependencies

    // Retrofit
    implementation 'com.squareup.retrofit2:retrofit:2.9.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.9.0'

    // Mock web server
    testImplementation 'com.squareup.okhttp3:mockwebserver:4.10.0'

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data class ApiResponse<T>(
    val httpCode: Int = HttpURLConnection.HTTP_OK,
    val body: T? = null,
    val errorMessage: String? = null,
)

aqua30

interface UserRepository {

    suspend fun getAllUsers(): ApiResponse<List<User>>

    suspend fun getUserById(id: Int): ApiResponse<User>
}

aqua30

const val BASE_USER_PATH_URL = "/aqua30/users"

interface TestApis {

    @GET(BASE_USER_PATH_URL)
    suspend fun getAllUsers(): List<User>

    @GET("$BASE_USER_PATH_URL/{id}")
    suspend fun getUserById(@Path("id") id: Int): User
}