def METHOD_NAME(journ_app_nav: JournalistAppNavigator) -> None:
    # Message begins unstarred
    with pytest.raises(NoSuchElementException):
        journ_app_nav.driver.find_element_by_id("starred-source-link-1")
    # Journalist stars the message
    journ_app_nav.driver.find_element_by_class_name("button-star").click()
    def message_starred():
        starred = journ_app_nav.driver.find_elements_by_id("starred-source-link-1")
        assert len(starred) == 1
    journ_app_nav.nav_helper.wait_for(message_starred)
    # Journalist unstars the message
    journ_app_nav.driver.find_element_by_class_name("button-star").click()
    def message_unstarred():
        with pytest.raises(NoSuchElementException):
            journ_app_nav.driver.find_element_by_id("starred-source-link-1")
    journ_app_nav.nav_helper.wait_for(message_unstarred)