if err != nil {
			if !testCases[i].expectErr {
				t.Errorf("case [%d]: unexpected mismatch, expect error[%v], got error[%v]", i, testCases[i].expectErr, err)
			}
			continue
		}
	}
}

func Test_validatePortRange(t *testing.T) {
	testCases := []struct {
		portRange string
		expectErr bool
		desc      string
	}{
		{ // case[0]
			portRange: "a-b",
			expectErr: true,
			desc:      "invalid port number",