LoginActivityTest - empty state test - refactor 2

LoginActivityTest.java

@Test
public void whenPasswordIsEmpty_andClickOnLoginButton_shouldDisplayDialog() {
  testEmptyFieldState(R.id.login_username);
}

@Test
public void whenUserNameIsEmpty_andClickOnLoginButton_shouldDisplayDialog() {
  testEmptyFieldState(R.id.login_password);
}

private void testEmptyFieldState(int notEmptyFieldId){
  onView(withId(notEmptyFieldId)).perform(typeText("defaultText"));
  onView(withId(R.id.login_button)).perform(click());
  onView(withText(R.string.validation_message)).check(matches(isDisplayed()));
  onView(withText(R.string.ok)).perform(click());
}