test - add additional test cases

Author: nicholas-fedor

internal/eui64/tests/calculator_test.go

@@ -192,6 +192,14 @@ func TestCalculateEUI64(t *testing.T) {
 			wantFullIP:      "",
 			wantErr:         "parsing MAC address failed",
 		},
+		{
+			name:            "MAC exactly 6 bytes but invalid",
+			mac:             "00-14-22-01-23-ZZ", // 6 bytes, invalid hex
+			prefix:          "2001:0db8",
+			wantInterfaceID: "",
+			wantFullIP:      "",
+			wantErr:         "parsing MAC address failed",
+		},
 	}
 
 	for _, tt := range tests {
@@ -312,6 +320,12 @@ func TestParsePrefix(t *testing.T) {
 			wantParts: []string{"2001", "0db8"},
 			wantErr:   "", // Covers 88-94 if not already
 		},
+		{
+			name:      "Prefix with empty first hextet",
+			prefix:    ":2001:0db8",
+			wantParts: []string{"", "2001", "0db8"},
+			wantErr:   "",
+		},
 	}
 
 	for _, testCase := range tests {

internal/eui64/tests/construct_full_ip_test.go

@@ -68,6 +68,12 @@ func TestConstructFullIP(t *testing.T) {
 			mac:         []byte{0x00, 0x14, 0x22, 0x01, 0x23, 0x45},
 			wantIP:      "::214:22ff:fe01:2345",
 		},
+		{
+			name:        "Prefix with single empty hextet",
+			prefixParts: []string{"2001", "", "0db8", "abcd"},
+			mac:         []byte{0x00, 0x14, 0x22, 0x01, 0x23, 0x45},
+			wantIP:      "2001:0:db8:abcd:214:22ff:fe01:2345",
+		},
 	}
 
 	for _, testCase := range tests {