def METHOD_NAME(config_virtual_collections):
    api = API(config_virtual_collections)
    headers, status, content = api.landing_page({}, {'f': 'json'})
    content = json.loads(content)
    assert headers['Content-Type'] == 'application/json'
    assert status == 200
    assert len(content['links']) == 15
    for link in content['links']:
        assert link['href'].startswith(api.config['server']['url'])
    headers, status, content = api.landing_page({}, {'f': 'html'})
    assert status == 200
    assert headers['Content-Type'] == 'text/html'