{
  "id": "python/unittest-testcase-setup-teardown-error",
  "signature": "RuntimeError: tearDownClass() called before setUpClass()",
  "signature_zh": "运行时错误：tearDownClass() 在 setUpClass() 之前被调用",
  "regex": "RuntimeError:\\ tearDownClass\\(\\)\\ called\\ before\\ setUpClass\\(\\)",
  "domain": "python",
  "category": "runtime_error",
  "subcategory": null,
  "root_cause": "在 unittest.TestCase 中，setUpClass 或 tearDownClass 被错误地调用，或类方法装饰器使用不当。",
  "root_cause_type": "generic",
  "root_cause_zh": "在 unittest.TestCase 中，setUpClass 或 tearDownClass 被错误地调用，或类方法装饰器使用不当。",
  "versions": [
    {
      "version": "3.9",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "3.10",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "可能无法清理资源。",
      "fail_rate": 0.6,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "会重复初始化，且逻辑混乱。",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "",
      "success_rate": 1.0,
      "how": "`@classmethod` 必须在 setUpClass 和 tearDownClass 上，且不能手动调用。",
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "success_rate": 0.9,
      "how": "确保父类正确调用 super().setUpClass() 和 super().tearDownClass()。",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": null,
  "official_doc_section": null,
  "error_code": null,
  "verification_tier": "ai_generated",
  "confidence": 0.87,
  "fix_success_rate": 0.8,
  "resolvable": "true",
  "first_seen": "2025-01-15",
  "last_confirmed": "2025-01-01",
  "last_updated": "2025-01-01",
  "evidence_count": 0,
  "tags": [],
  "locale": "en",
  "aliases": []
}