René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Lesson: Tests for a class method should live in the test file for that class","articleBody":"## Context\n\nWhen adding `validated_get` and `ensure_get` methods to `KeyValueFileManager`, the tests for these methods were placed in `tests/usethis/_file/test_validate.py` instead of `tests/usethis/_file/test_manager.py`.\n\n## Root Cause\n\nThe tests were written near the `validate_or_raise`/`validate_or_default` tests since they use similar validation functionality. However, these methods are defined on `KeyValueFileManager` (in `manager.py`), not in `validate.py`.\n\n## Principle\n\n**Tests for a class method should live in the test file for that class, not in the test file for the utilities the method uses internally.** The test file structure should mirror the source file structure. If a method is defined on `KeyValueFileManager` in `manager.py`, its tests belong under `TestKeyValueFileManager` in `test_manager.py`.\n\n## Affected Skills\n\nThe `usethis-python-test` skill should include guidance on test placement: always match test class structure to the source class hierarchy.","author":{"url":"https://github.com/nathanjmcdougall","@type":"Person","name":"nathanjmcdougall"},"datePublished":"2026-04-08T02:54:10.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/1895/usethis-python/issues/1895"}