import unittest\nimport user_code\n\nclass TestEvaluateExpression(unittest.TestCase):\n    def test_result1(self):\n        if not hasattr(user_code, 'result1'):\n            self._testMethodName = 'result1 is not defined'\n            self.fail()\n        result1 = getattr(user_code, 'result1')\n        expected = 11\n        if result1 != expected:\n            self._testMethodName = f'result1 is {result1}, but expected {expected}'\n            self.fail()\n        else:\n            self._testMethodName = f'result1 correctly equals {expected}'\n\n    def test_result2(self):\n        if not hasattr(user_code, 'result2'):\n            self._testMethodName = 'result2 is not defined'\n            self.fail()\n        result2 = getattr(user_code, 'result2')\n        expected = 2.5\n        if result2 != expected:\n            self._testMethodName = f'result2 is {result2}, but expected {expected}'\n            self.fail()\n        else:\n            self._testMethodName = f'result2 correctly equals {{expected}}'\n\n    def test_result3(self):\n        if not hasattr(user_code, 'result3'):\n            self._testMethodName = 'result3 is not defined'\n            self.fail()\n        result3 = getattr(user_code, 'result3')\n        if isinstance(result3, Exception) or result3 == 'Error' or result3 is None:\n            self._testMethodName = 'result3 correctly handles division by zero'\n        else:\n            self._testMethodName = 'result3 should indicate an error due to division by zero'\n            self.fail()

challenge 1