@Test
public void testHandleAttributeAddition_Calendars() {

    popup.handleAttributeAddition(Attribute.CALENDARS.getAttributeName());
    assertThat(model.attributes).containsExactly(new RuleAttribute(Attribute.CALENDARS.getAttributeName(), ""));
    assertThat(model.metadataList).isEmpty();
    verify(refreshCommand).execute();
}