add test for NewSymmetricKey

Signed-off-by: qmuntal <qmuntaldiaz@microsoft.com>

key.go

@@ -315,11 +315,10 @@ func NewEC2Key(alg Algorithm, x, y, d []byte) (*Key, error) {
 // NewSymmetricKey returns a Key created using the provided Symmetric key
 // bytes.
 func NewSymmetricKey(k []byte) *Key {
-	key := &Key{
+	return &Key{
 		KeyType: KeyTypeSymmetric,
 		K:       k,
 	}
-	return key
 }
 
 // NewKeyFromPublic returns a Key created using the provided crypto.PublicKey.

key_test.go

@@ -473,6 +473,29 @@ func TestNewEC2Key(t *testing.T) {
 	}
 }
 
+func TestNewSymmetricKey(t *testing.T) {
+	type args struct {
+		k []byte
+	}
+	tests := []struct {
+		name string
+		args args
+		want *Key
+	}{
+		{"valid", args{[]byte{1, 2, 3}}, &Key{
+			KeyType: KeyTypeSymmetric,
+			K:       []byte{1, 2, 3},
+		}},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := NewSymmetricKey(tt.args.k); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("NewSymmetricKey() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
 func TestKey_SignRoundtrip(t *testing.T) {
 	tests := []struct {
 		name   string