LoginFragmentTest.kt

@Test
fun isSignInButtonEnabledBinding() {
    isSignInButtonEnabled.set(true)
    onView(withId(R.id.button_sign_in)).check(matches(isEnabled()))
}

@Test
fun isProgressBarVisibleBinding() {
    isProgressBarVisible.set(true)
    onView(withId(R.id.progress_overlay)).check(matches(isDisplayed()))
}

@Test
fun emailTextChangedListenerBinding() {
    onView(withId(R.id.edit_text_email)).perform(
            typeText("email"), closeSoftKeyboard())
  
    verify(emailTextChangedListener, times(5)).afterTextChanged(any())
}

@Test
fun passwordTextChangedListenerBinding() {
    onView(withId(R.id.edit_text_password)).perform(
            typeText("password"), closeSoftKeyboard())
  
    verify(passwordTextChangedListener, times(8)).afterTextChanged(any())
}

@Test
fun emailFieldBinding() {
    onView(withId(R.id.edit_text_email)).perform(
            typeText("email"), closeSoftKeyboard())
  
    assertThat(emailField.get(), `is`("email"))
}

@Test
fun passwordFieldBinding() {
    onView(withId(R.id.edit_text_password)).perform(
            typeText("password"), closeSoftKeyboard())
  
    assertThat(passwordField.get(), `is`("password"))
}