if got := npa.ContainsIPv4Loopback(); got != tt.want {
				t.Errorf("IPv4 ContainsIPv4Loopback() = %v, want %v", got, tt.want)
			}
			// ContainsIPv4Loopback should always be false for family=IPv6
			npa = NewNodePortAddresses(v1.IPv6Protocol, tt.cidrStrings)
			if got := npa.ContainsIPv4Loopback(); got {
				t.Errorf("IPv6 ContainsIPv4Loopback() = %v, want %v", got, false)
			}
		})
	}