Fix all PEP-008 issues

bin/run_tests.py

@@ -1,17 +1,19 @@
 #!/usr/bin/env python3
 
-import os, sys, subprocess, shutil, json
+import os
+import subprocess
+import sys
 from glob import glob
 
 if __name__ == '__main__':
     # move cwd to the project root
     os.chdir(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
-    ### run the unit tests
+    # run the unit tests
 
     subprocess.check_call([sys.executable, '-m', 'pytest', 'unit_test'])
 
-    ### run the integration tests
+    # run the integration tests
 
     test_projects = sorted(glob('test/??_*'))