[Test Improver] test: add unit tests for drift-detection helpers (0% -> ~100%)#727
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Add 35 new tests for apm_cli.drift -- pure stateless helpers that drive diff-aware apm install decisions: - detect_ref_change: update_refs mode, new package (None locked), same ref, ref added/removed/changed, hash-based pin changes (11 tests) - detect_orphans: partial install guard, no-lockfile first install, all packages present, single and multiple orphaned packages, empty manifest, None only_packages treated as empty (7 tests) - detect_config_drift: empty inputs, unchanged config, changed config, brand-new entries ignored, multi-entry partial drift, stored superset not flagged (7 tests) - build_download_ref: no lockfile, update_refs mode, ref_changed, locked commit SHA used, 'cached' sentinel not used, proxy host+prefix restored, proxy fallback ref, proxy with existing ref not overridden, non-proxy host diff, key missing from lockfile (10 tests) These helpers are documented as 'easy to test in isolation' yet had no dedicated test file. They are on the critical path of every apm install run -- a bug here can silently prevent re-downloads or incorrectly trigger them. Tests: 3830 -> 3865 (+35) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Goal and Rationale
src/apm_cli/drift.pycontains four pure, stateless functions that drive every diff-awareapm installdecision: which packages need re-downloading, which files should be cleaned up, and how to build reproducible download references.The module's own docstring says these helpers are "easy to test in isolation" — yet they had no dedicated test file. A silent bug in any of these functions can cause:
Approach
Tests use minimal in-file dataclass stubs (
_LockedDep,_LockFile) to keep the test file self-contained and dependency-free. No mocking framework or I/O required.detect_ref_changeupdate_refsbypass, new package, same/added/removed/changed ref, hash-based pinsdetect_orphansNonetreated as emptydetect_config_driftbuild_download_refupdate_refs,ref_changed, locked commit SHA,'cached'sentinel skipped, proxy host+prefix restored, proxy fallback ref, key missingCoverage Impact
src/apm_cli/drift.pyTest Status
All 3865 tests pass (3830 baseline + 35 new):
Reproducibility