### Question:
ClusterAdminService { public List<Cluster> all() { return clusterAdminBiz.all(); }  void create(String name, String config); void update(String name, String config); void delete(String name); List<Cluster> all();  }### Answer:
@Test public void testAll() throws Exception { List<Cluster> clusters = clusterAdminService.all(); Assert.assertNotNull(clusters); Assert.assertEquals(1, clusters.size()); }