python type_error ai_generated true

TypeError: TestCase.__init__() 缺少 1 个必需的位置参数: 'methodName'

TypeError: TestCase.__init__() missing 1 required positional argument: 'methodName'

ID: python/unittest-testcase-requires-method

其他格式: JSON · Markdown 中文 · English
80%修复率
86%置信度
0证据数
2024-04-03首次发现

版本兼容性

版本状态引入弃用备注
3.9 active — — —
3.12 active — — —

根因分析

直接实例化 `unittest.TestCase` 子类（如 `MyTest()`），而不是让测试运行器实例化，或忘记传入方法名。

English

Instantiating a `unittest.TestCase` subclass directly (e.g. `MyTest()`) instead of letting the test runner instantiate it, or forgetting to pass a method name.

generic

解决方案

  1. 95% 成功率 
    Use the test runner instead of instantiating directly:
import unittest
unittest.main()
# or
loader = unittest.TestLoader()
suite = loader.loadTestsFromTestCase(MyTest)
unittest.TextTestRunner().run(suite)
  2. 85% 成功率 
    If you must instantiate: `case = MyTest('test_something')` then `case.run(result)`.

无效尝试

常见但无效的做法:

  1. 60% 失败

    Creates an invalid test case that fails later at run time with a different error.

  2. 70% 失败

    Still raises because TestCase requires methodName.