{"id":"tester-files-never-import-internals","text":"Tester test files import only the public API (e.g., `from btree import BTree`), while developer test files import internal types like `WAL`, `_serialize_leaf`, and `HEADER_FMT` for state injection and internal invariant checking","truth_value":"IN","source":"entries/2026/05/29/topic-test-coverage-gaps.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"tester-files-never-import-internals","truth_value":"IN","reason":"premise"}]}}