if testCase.expectedIPList != nil && testCase.expectedIPList.Intersection(ipList).IsEmpty() {
			t.Fatalf("host: expected = %v, got = %v", testCase.expectedIPList, ipList)
		}
	}
}

func TestGetHostIP(t *testing.T) {
	testCases := []struct {
		host           string
		expectedIPList set.StringSet
		expectedErr    error
	}{
		{"localhost", set.CreateStringSet("127.0.0.1"), nil},
	}