def checkWizardStep(self, response, step_no):
        """
        Helper function to test each step of the wizard
        - Make sure the call succeeded
        - Make sure response is the proper step number
        - return the result from the post for the next step
        """
        step_count = len(self.wizard_step_data)

        self.assertEqual(response.status_code, 200)
        self.assertContains(response, 'Step %d of %d' % (step_no, step_count))

        data = self.grabFieldData(response)
        data.update(self.wizard_step_data[1 - step_no])

        return self.client.post(self.wizard_url, data)
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/tests/regressiontests/formwizard/tests.py/FormWizardWithNullBooleanField.checkWizardStep/swapped operands of `-`