Make an error.

Author: shunping

sdks/python/apache_beam/dataframe/io_test.py

@@ -179,6 +179,7 @@ def test_read_write(
       requires=()):
     self._run_read_write_test(
         format, read_kwargs, write_kwargs, check_options, requires)
+    self.assertEqual(1, 2)
 
   # pylint: disable=dangerous-default-value
   def _run_read_write_test(