Add unmarshal unit tests for extensions

Adds missing unmarshal unit tests for extensions that did not have them.
These ensure that marshal / unmarshal is round-trippable.

Signed-off-by: Daniel Mangum <georgedanielmangum@gmail.com>

pkg/protocol/extension/supported_elliptic_curves_test.go

@@ -22,4 +22,11 @@ func TestExtensionSupportedGroups(t *testing.T) {
 	} else if !reflect.DeepEqual(raw, rawSupportedGroups) {
 		t.Errorf("extensionSupportedGroups marshal: got %#v, want %#v", raw, rawSupportedGroups)
 	}
+
+	roundtrip := &SupportedEllipticCurves{}
+	if err := roundtrip.Unmarshal(raw); err != nil {
+		t.Error(err)
+	} else if !reflect.DeepEqual(roundtrip, parsedSupportedGroups) {
+		t.Errorf("extensionSupportedGroups unmarshal: got %#v, want %#v", roundtrip, parsedSupportedGroups)
+	}
 }

pkg/protocol/extension/supported_point_formats_test.go

@@ -22,4 +22,11 @@ func TestExtensionSupportedPointFormats(t *testing.T) {
 	} else if !reflect.DeepEqual(raw, rawExtensionSupportedPointFormats) {
 		t.Errorf("extensionSupportedPointFormats marshal: got %#v, want %#v", raw, rawExtensionSupportedPointFormats)
 	}
+
+	roundtrip := &SupportedPointFormats{}
+	if err := roundtrip.Unmarshal(raw); err != nil {
+		t.Error(err)
+	} else if !reflect.DeepEqual(roundtrip, parsedExtensionSupportedPointFormats) {
+		t.Errorf("extensionSupportedPointFormats unmarshal: got %#v, want %#v", roundtrip, parsedExtensionSupportedPointFormats)
+	}
 }

pkg/protocol/extension/supported_signature_algorithms_test.go

@@ -35,4 +35,11 @@ func TestExtensionSupportedSignatureAlgorithms(t *testing.T) {
 	} else if !reflect.DeepEqual(raw, rawExtensionSupportedSignatureAlgorithms) {
 		t.Errorf("extensionSupportedSignatureAlgorithms marshal: got %#v, want %#v", raw, rawExtensionSupportedSignatureAlgorithms)
 	}
+
+	roundtrip := &SupportedSignatureAlgorithms{}
+	if err := roundtrip.Unmarshal(raw); err != nil {
+		t.Error(err)
+	} else if !reflect.DeepEqual(roundtrip, parsedExtensionSupportedSignatureAlgorithms) {
+		t.Errorf("extensionSupportedSignatureAlgorithms unmarshal: got %#v, want %#v", roundtrip, parsedExtensionSupportedSignatureAlgorithms)
+	}
 }