MCOL-5496: Merge CMAPI code to engine repo.

[add] cmapi code to engine

cmapi/mcs_node_control/test/test_dbrm_socket.py

@@ -0,0 +1,29 @@
+import io
+import logging
+import unittest
+
+from mcs_node_control.models.dbrm_socket import MAGIC_BYTES, DBRMSocketHandler
+
+
+logging.basicConfig(level='DEBUG')
+
+
+class TestDBRMSocketHandler(unittest.TestCase):
+
+    def test_myreceive_to_magic(self):
+        response_data = b'\x01\x00\x00\x00\x00'
+        valid_magic = b'%s%s' % (MAGIC_BYTES, response_data)
+        first_unknow = b'A%s%s' % (MAGIC_BYTES, response_data)
+        partial_first_magic = b'%s%s%s' % (
+            MAGIC_BYTES[:3], MAGIC_BYTES, response_data
+        )
+        sock_responses = [valid_magic, first_unknow, partial_first_magic]
+        for sock_response in sock_responses:
+            with self.subTest(sock_response=sock_response):
+                data_stream = io.BytesIO(sock_response)
+                data_stream.recv = data_stream.read
+                dbrm_socket = DBRMSocketHandler()
+                # pylint: disable=protected-access
+                dbrm_socket._socket = data_stream
+                dbrm_socket._receive_magic()
+                self.assertEqual(data_stream.read(), response_data)