Make the test run fail if a test fails.

Author: scoder

lupa/tests/__main__.py

@@ -1,4 +1,5 @@
 if __name__ == '__main__':
+    import sys
     import unittest
     from . import suite
-    unittest.TextTestRunner(verbosity=2).run(suite())
+    sys.exit(1 if unittest.TextTestRunner(verbosity=2).run(suite()).failures else 0)