Merge pull request #1470 from Unity-Technologies/release-v0.6-make-test-directory-agnostic

made the pytest directory agnostic

ml-agents/tests/trainers/test_demo_loader.py

 import unittest.mock as mock
 import pytest
+import os
-    brain_parameters, brain_infos, total_expected = load_demonstration('./tests/trainers/test.demo')
+    path_prefix = os.path.dirname(os.path.abspath(__file__))
+    brain_parameters, brain_infos, total_expected = load_demonstration(path_prefix+'/test.demo')
     assert (brain_parameters.brain_name == "Ball3DBrain")
     assert (brain_parameters.vector_observation_space_size == 8)
     assert (len(brain_infos) == total_expected)

ml-agents/tests/trainers/test_trainer_controller.py

 import json
 import unittest.mock as mock
+import os
 
 import yaml
 import pytest
         '''
         default:
             trainer: offline_bc
-            demo_path: ./tests/trainers/test.demo
+            demo_path: '''
+        + os.path.dirname(os.path.abspath(__file__)) + '''/test.demo
             batches_per_epoch: 16
             batch_size: 32
             beta: 5.0e-3