// invalid dnsPolicy.
	return podDNSCluster, fmt.Errorf("invalid DNSPolicy=%v", dnsPolicy)
}

// mergeDNSOptions merges DNS options. If duplicated, entries given by PodDNSConfigOption will
// overwrite the existing ones.
func mergeDNSOptions(existingDNSConfigOptions []string, dnsConfigOptions []v1.PodDNSConfigOption) []string {
	optionsMap := make(map[string]string)

		},
	}

	for _, tc := range testCases {
		options := mergeDNSOptions(tc.existingDNSConfigOptions, tc.dnsConfigOptions)
		// Options order may be changed after conversion.
		if !sets.New[string](options...).Equal(sets.New[string](tc.expectedOptions...)) {
			t.Errorf("%s: mergeDNSOptions(%v, %v)=%v, want %v", tc.desc, tc.existingDNSConfigOptions, tc.dnsConfigOptions, options, tc.expectedOptions)
		}