Assert a link with the provided URL is visible on the page.

def should_see_link(self, link_url):
    """Assert a link with the provided URL is visible on the page."""

    elements = ElementSelector(
        world.browser,
        str('//a[@href="%s"]' % link_url),
        filter_displayed=True,
    )
    if not elements:
        raise AssertionError("Expected link not found.")