1 files changed, 47 insertions, 0 deletions
diff --git a/pkg/tcpip/header/eth_test.go b/pkg/tcpip/header/eth_test.go
index 14413f2ce..3bc8b2b21 100644
--- a/pkg/tcpip/header/eth_test.go
+++ b/pkg/tcpip/header/eth_test.go
@@ -67,6 +67,53 @@ func TestIsValidUnicastEthernetAddress(t *testing.T) {
 	}
 }
 
+func TestIsMulticastEthernetAddress(t *testing.T) {
+	tests := []struct {
+		name     string
+		addr     tcpip.LinkAddress
+		expected bool
+	}{
+		{
+			"Nil",
+			tcpip.LinkAddress([]byte(nil)),
+			false,
+		},
+		{
+			"Empty",
+			tcpip.LinkAddress(""),
+			false,
+		},
+		{
+			"InvalidLength",
+			tcpip.LinkAddress("\x01\x02\x03"),
+			false,
+		},
+		{
+			"Unspecified",
+			unspecifiedEthernetAddress,
+			false,
+		},
+		{
+			"Multicast",
+			tcpip.LinkAddress("\x01\x02\x03\x04\x05\x06"),
+			true,
+		},
+		{
+			"Unicast",
+			tcpip.LinkAddress("\x02\x02\x03\x04\x05\x06"),
+			false,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			if got := IsMulticastEthernetAddress(test.addr); got != test.expected {
+				t.Fatalf("got IsMulticastEthernetAddress = %t, want = %t", got, test.expected)
+			}
+		})
+	}
+}
+
 func TestEthernetAddressFromMulticastIPv4Address(t *testing.T) {
 	tests := []struct {
 		name             string