test(model): покрытие SRV, неполных MX/SRV значений и изоляция теста приоритета MX

internal/model/record_test.go

@@ -37,6 +37,58 @@ func TestEqualMXPriorityAndOrder(t *testing.T) {
 	if a.Equal(c) {
 		t.Fatal("different priority must not be equal")
 	}
+
+	// Isolated case: same value count and same target, only priority differs —
+	// must fail on priority comparison, not on a length mismatch shortcut.
+	d := Record{Type: MX, Name: "example.com.", TTL: 3600, Values: []string{"10 mx1.example.com."}}
+	e := Record{Type: MX, Name: "example.com.", TTL: 3600, Values: []string{"20 mx1.example.com."}}
+	if d.Equal(e) {
+		t.Fatal("different MX priority with same target and value count must not be equal")
+	}
+}
+
+func TestEqualSRVBasic(t *testing.T) {
+	a := Record{Type: SRV, Name: "_sip._tcp.example.com.", TTL: 3600, Values: []string{
+		"10 20 5060 sipserver.example.com.",
+		"5 10 5061 backup.example.com.",
+	}}
+	b := Record{Type: SRV, Name: "_sip._tcp.example.com.", TTL: 3600, Values: []string{
+		"5 10 5061 BACKUP.Example.COM.",
+		"10 20 5060 SIPServer.Example.com.",
+	}}
+	if !a.Equal(b) {
+		t.Fatal("SRV records equal regardless of order and target case")
+	}
+
+	// Isolated: identical single value except priority differs.
+	c1 := Record{Type: SRV, Name: "_sip._tcp.example.com.", TTL: 3600, Values: []string{"10 20 5060 sipserver.example.com."}}
+	c2 := Record{Type: SRV, Name: "_sip._tcp.example.com.", TTL: 3600, Values: []string{"20 20 5060 sipserver.example.com."}}
+	if c1.Equal(c2) {
+		t.Fatal("different SRV priority must not be equal")
+	}
+
+	// Isolated: identical single value except port differs.
+	d1 := Record{Type: SRV, Name: "_sip._tcp.example.com.", TTL: 3600, Values: []string{"10 20 5060 sipserver.example.com."}}
+	d2 := Record{Type: SRV, Name: "_sip._tcp.example.com.", TTL: 3600, Values: []string{"10 20 5061 sipserver.example.com."}}
+	if d1.Equal(d2) {
+		t.Fatal("different SRV port must not be equal")
+	}
+}
+
+func TestNormalizeValueIncompleteNoPanic(t *testing.T) {
+	// MX value missing the target field.
+	a := Record{Type: MX, Name: "example.com.", TTL: 300, Values: []string{"10"}}
+	b := Record{Type: MX, Name: "example.com.", TTL: 300, Values: []string{"10"}}
+	if !a.Equal(b) {
+		t.Fatal("incomplete MX values with identical content should be equal, not panic")
+	}
+
+	// SRV value missing port and target fields.
+	c := Record{Type: SRV, Name: "_sip._tcp.example.com.", TTL: 300, Values: []string{"10 20"}}
+	d := Record{Type: SRV, Name: "_sip._tcp.example.com.", TTL: 300, Values: []string{"10 20"}}
+	if !c.Equal(d) {
+		t.Fatal("incomplete SRV values with identical content should be equal, not panic")
+	}
 }
 
 func TestEqualTXTCaseSensitive(t *testing.T) {