@RunWith(AndroidJUnit4::class)
class TestLoginRecipeActivityTest {

    @Rule
    @JvmField
    var activityRule = ActivityTestRule<TestLoginRecipeActivity>(TestLoginRecipeActivity::class.java)

    @Test
    fun should_ShowEmailEmptyError_When_EmailInputIsEmpty() {
        onView(withId(R.id.vTestLoginLoginBtn)).perform(click())
        onView(withId(R.id.vTestLoginEmailInput)).check(matches(hasErrorText(R.string.test_login_empty_field)))
    }

    @Test
    fun should_ShowEmailInvalidError_When_EmailIsNotWellFormatted() {
        onView(withId(R.id.vTestLoginEmailInput)).perform(typeText(INVALID_EMAIL))
        onView(withId(R.id.vTestLoginLoginBtn)).perform(click())
        onView(withId(R.id.vTestLoginEmailInput)).check(matches(hasErrorText(R.string.test_login_invalid_email)))
    }

    @Test
    fun should_ShowPasswordEmptyError_When_PasswordInputIsEmpty() {
        onView(withId(R.id.vTestLoginLoginBtn)).perform(click())
        onView(withId(R.id.vTestLoginPasswordInput)).check(matches(hasErrorText(R.string.test_login_empty_field)))
    }

    // A custom matcher to match a String resource with an error message.
    private fun hasErrorText(@StringRes errorRes: Int) = hasErrorText(activityRule.activity.getString(errorRes))

    companion object {
        const val INVALID_EMAIL = "invalid"
    }
}