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tests/CLAUDE.md

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+# Testing Guidelines
+
+## General Principles
+
+- **No test classes** - Use plain functions, not class-based test organization
+- **Minimal mocking** - Use real backends with temp directories whenever possible; only mock when absolutely necessary
+- **Use mocker fixture** - When mocking is required, use the `mocker` fixture (pytest-mock), never unittest mocks
+
+## File Organization
+
+```
+tests/unit/layer/volumetric/<module>/
+├── test_<component>.py    # One file per component
+```
+
+## Naming Conventions
+
+- Test files: `test_<component>.py`
+- Test functions: `test_<feature>_<scenario>`
+
+## Fixtures
+
+- Function-scoped (default)
+- Use `tempfile.TemporaryDirectory()` for temp dirs
+- Explicit cleanup via context managers or yield pattern
+
+## Assertions
+
+- `pytest.approx()` for float comparisons
+- `np.testing.assert_array_equal()` for array comparisons
+- `pytest.raises(ExceptionType, match="pattern")` for exception testing