add main function, them we can run the test file individually

src/Acquisition/tests.py

@@ -2593,3 +2593,6 @@ def test_suite():
         unittest.makeSuite(TestAcquire),
         unittest.makeSuite(TestUnicode),
         ))
+
+if __name__ == '__main__':
+    unittest.main(defaultTest='test_suite')