Fix some Python PEP 8 warnings, notably including some warnings that were printed in all test runs causing a lot of noise in the log.
diff --git a/tests/test_dependency_loop.py b/tests/test_dependency_loop.py
index b9698bb..e1abf52 100755
--- a/tests/test_dependency_loop.py
+++ b/tests/test_dependency_loop.py
@@ -142,5 +142,5 @@
         COMMON_DEFINITIONS,
         source)
 
-if __name__== '__main__':
+if __name__ == '__main__':
     main(__file__)