updated tests

python/test_unityagents.py

 import pytest
 import socket
 import mock
+import struct
+
+def append_length(input):
+    return struct.pack("I", len(input.encode())) + input.encode()
+
+
+  "apiNumber":"API-2",
   "brainParameters": [{
       "stateSize": 3,
       "actionSize": 2,
 
 dummy_reset = [
 'CONFIG_REQUEST'.encode(),
+append_length(
 '''
 {
   "brain_name": "RealFakeBrain",
   "actions": [1,2,3,4],
   "memories": [],
   "dones": [false, false]
-}'''.encode(),
+}'''),
-'''
+append_length('''
 {
   "brain_name": "RealFakeBrain",
   "agents": [1,2,3],
   "memories": [],
   "dones": [false, false, false]
-}'''.encode(),
+}'''),
-'''
+append_length('''
 {
   "brain_name": "RealFakeBrain",
   "agents": [1,2,3],
   "memories": [],
   "dones": [false, false, true]
-}'''.encode(),
+}'''),
-
+
 
 def test_initialialization():
     with mock.patch('subprocess.Popen') as mock_subproc_popen: