diff --git a/imgbom/protocol_test.go b/imgbom/protocol_test.go
new file mode 100644
index 000000000..c76f07db8
--- /dev/null
+++ b/imgbom/protocol_test.go
@@ -0,0 +1,43 @@
+package imgbom
+
+import "testing"
+
+func TestNewProtocol(t *testing.T) {
+	testCases := []struct {
+		desc     string
+		input    string
+		expType  ProtocolType
+		expValue string
+	}{
+		{
+			desc:     "directory protocol",
+			input:    "dir:///opt/",
+			expType:  DirProtocol,
+			expValue: "/opt/",
+		},
+		{
+			desc:     "unknown protocol",
+			input:    "s4:///opt/",
+			expType:  ImageProtocol,
+			expValue: "s4:///opt/",
+		},
+		{
+			desc:     "docker protocol",
+			input:    "docker://ubuntu:20.04",
+			expType:  ImageProtocol,
+			expValue: "docker://ubuntu:20.04",
+		},
+	}
+	for _, test := range testCases {
+		t.Run(test.desc, func(t *testing.T) {
+			p := NewProtocol(test.input)
+			if p.Type != test.expType {
+				t.Errorf("mismatched type in protocol: '%v' != '%v'", p.Type, test.expType)
+			}
+			if p.Value != test.expValue {
+				t.Errorf("mismatched protocol value: '%s' != '%s'", p.Value, test.expValue)
+			}
+
+		})
+	}
+}