Writes a unit test for one Python function. Use when the user asks for tests of existing code; not for integration tests.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Write tests
1. Create the test file named `<module>_test.py` next to the module.
2. Use this shape:
```python
import unittest
from parcel_calc import total
ITEMS = [10, 20]
class TotalTest(unittest.TestCase):
def test_total(self):
self.assertEqual(total(ITEMS), 30)
def test_total_empty(self):
self.assertEqual(total([]), 0)
if __name__ == "__main__":
unittest.main()
```
3. Run `python <module>_test.py` and confirm that both tests pass.
The line at the top of this page pins the label git:20261016.7bc6b88, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.
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pass: No zero-width or bidi control characters
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pass: No link to an exfiltration or paste host
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Source
GitHub
goldziher/ai-rulez · 166 stars · license MIT · pushed 2026-11-03 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_lxtg2dawkyefy63h
GET https://markdownregistry.com/api/v1/resolve?ref=goldziher/ai-rulez/write-tests
GET https://markdownregistry.com/api/v1/blob/51bdf15588a594c94b7e01ad84fe8806f51c2a7e74b91f0cec7160571c8f269d
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