Tests: add tests for hmac

test/python/test_instructions.py

@@ -279,3 +279,15 @@ def test_sign_message(
         pass
     data = client.get_async_response()
     checker.check_signature(account, tx, with_hash, data)
+
+
+@pytest.mark.parametrize("account", [DEFAULT_ACCOUNT])
+def test_hmac(
+        account: Account,
+        client: TezosClient) -> None:
+    """Test the HMAC instruction."""
+
+    message = bytes.fromhex("0123456789abcdef")
+    data = client.hmac(account, message)
+    hmac = bytes.fromhex("dde436940ab1602029a49dc77e6263b633fa3567c4d8479820d4f77072369ac1")
+    assert data == hmac, f"No expected {hmac.hex()} but got {data.hex()}"

test/python/utils/client.py

@@ -224,3 +224,18 @@ def sign_message(self,
                 index=Index.LAST,
                 payload=message.raw):
             yield
+
+    def hmac(self,
+             account: Account,
+             message: bytes) -> bytes:
+        """Send the HMAC instruction."""
+
+        data: bytes = b''
+
+        data += account.path
+        data += message
+
+        return self._exchange(
+            ins=Ins.HMAC,
+            sig_scheme=account.sig_scheme,
+            payload=data)