    @Test
    public void rdsTestGetOneInstance(){

        Mockito.when(amazonRDSClient.describeDBInstances(Mockito.any())).thenReturn(
                new DescribeDBInstancesResult().withDBInstances(
                        initializeInstance("instance1", RDS_ENGINE_PG, "gk-A-instance", "db-gk1", STATUS_AVAILABLE, SG_ONE, null)));
        Optional<GatekeeperRDSInstance> instance = rdsLookupService.getOneInstance(test, "gk-A-instance", "gk-A-instance");
        Assert.assertTrue(instance.isPresent());
        Assert.assertEquals("TEST", instance.get().getApplication());
        Assert.assertEquals("available", instance.get().getStatus());
        Assert.assertEquals(new HashSet<>(Arrays.asList("gk_readonly","gk_datafix","gk_dba")), new HashSet<>(instance.get().getAvailableRoles()));
    }