Implement test coverage for app

test_app.py

@@ -37,15 +37,22 @@ except ImportError:
 
 
 def run_tests(*test_args):
+    from coverage import Coverage
+
+    cov = Coverage()
     if not test_args:
         test_args = ['ai_blocker.tests']
 
     TestRunner = get_runner(settings)
     test_runner = TestRunner()
+    cov.start()
     failures = test_runner.run_tests(test_args)
+    cov.stop()
     if failures:
         sys.exit(failures)
 
+    cov.html_report()
+
 
 if __name__ == '__main__':
     run_tests(*sys.argv[1:])