Tests MUST NOT modify sys.path, and if they do, they shall be chastised for

their disobedience.

utilities/testrunner.py

@@ -52,10 +52,12 @@ class TestRunner:
         path, filename=os.path.split(filepath)
         name, ext=os.path.splitext(filename)
         file, pathname, desc=imp.find_module(name, [path])
+        saved_syspath = sys.path[:]
         try:
             module=imp.load_module(name, file, pathname, desc)
         finally:
             file.close()
+            sys.path[:] = saved_syspath
         function=getattr(module, 'test_suite', None)
         if function is None:
             return None