python-mock-patching-location skillA
python-mock-patching-location is agent-read markdown (skill) from fabioc-aloha/alex_skill_mall: Python mock.patch must target the import location, not the definition location.
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What the file says
# Python Mock Patching Location
**Category**: Testing
**Time Saved**: 30+ minutes debugging "mock not working"
**Battle-tested**: Yes — ChessCoach, multiple Python projects
---
## The Problem
You're writing a test that needs to mock `get_client()` from `module_a`. You patch `module_a.get_client`. The mock doesn't work — the real function still runs.
## Why It Happens
Python's import system creates a **reference** to the function in the importing module. When `module_b` does `from module_a import get_client`, it creates `module_b.get_client` as a separate reference. Patching the original doesn't affect the copy.
## The Rule
**Patch where the function is USED, not where it's DEFINED**
```python
# module_a.py defines get_client()
# module_b.py imports and calls it
# ❌ WRONG — patches the definition, not the usage
@patch('module_a.get_client')
def test_something(mock_client):
result = module_b.do_work() # Still calls real get_client!
# ✅ CORRECT — patches where it's called
@patch('module_b.get_client')
def test_something(mock_client):
result = module_b.do_work() # Uses mock
```
## Decision Table
| Import Style in Target Module | Patch Target |
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How to install
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Source
fabioc-aloha/alex_skill_mall · 4 stars · license MIT · pushed 2026-09-21 · branch main
API
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