UserUnitTest.kt

class UserUnitTest : BaseTest() {

    ...

    // TESTS
    @Test
    fun getUser_whenSuccess() {
        // Prepare data
        this.mockHttpResponse("getUser_whenSuccess.json", HttpURLConnection.HTTP_OK)
        // Pre-test
        assertEquals(null, this.viewModel.user.value, "User should be null because stream not started yet")
        // Execute View Model
        this.viewModel.getUser()
        // Checks
        assertEquals(EXPECTED_USER, this.viewModel.user.value, "User must be fetched")
        assertEquals(false, this.viewModel.isLoading.value, "Should be reset to 'false' because stream ended")
        assertEquals(null, this.viewModel.errorMessage.value, "No error must be founded")
    }

    @Test
    fun getUser_whenError(){
        // Prepare data
        this.mockHttpResponse("getUser_whenSuccess.json", HttpURLConnection.HTTP_BAD_GATEWAY)
        // Pre-test
        assertEquals(null, this.viewModel.user.value, "User should be null because stream not started yet")
        // Execute View Model
        this.viewModel.getUser()
        // Checks
        assertEquals(null, this.viewModel.user.value, "User must be null because of http error")
        assertEquals(false, this.viewModel.isLoading.value, "Should be reset to 'false' because stream ended")
        assertNotEquals(null, this.viewModel.errorMessage.value, "Error value must not be empty")
    }
}