Add pytest and pytest-xdist to the requirements, needed for unit tests

python/setup.py

@@ -14,6 +14,8 @@ setuptools.setup(
     packages=setuptools.find_packages(),
     install_requires=[
         'flake8~=3.8',
+        'pytest~=6.0',
+        'pytest-xdist~=1.34',
     ],
     dependency_links=[
     ],

requirements.txt

@@ -18,6 +18,8 @@
 # same modules should appear in the setup.py list as given below.
 
 flake8==3.8.3
+pytest==6.0.0
+pytest-xdist==1.34.0
 
 # Development dependencies
 #