# AssertionError: 0 != 1 : test order issue

- **ID:** `python/unittest-testcase-ordering`
- **Domain:** python
- **Category:** runtime_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

unittest测试方法按字母顺序执行，如果测试有依赖，顺序错误导致失败。

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 3.8 | active | — | — |
| 3.9 | active | — | — |
| 3.10 | active | — | — |

## Workarounds

1. **** (90% success)
   ```
   pip install pytest-dependency
@pytest.mark.dependency()
   ```
2. **** (85% success)
   ```
   def test_all(self):
    self.test_a()
    self.test_b()
   ```

## Dead Ends

- **** — 重命名可能破坏测试逻辑 (60% fail)
- **** — setUp/tearDown是每个测试独立，不能保证顺序 (70% fail)