---
phase: 19-checkout-command
plan: 02
subsystem: testing
tags: [checkout, e2e, pytest, disambiguation]

# Dependency graph
requires:
  - phase: 19-01
    provides: cmd_checkout.py implementation
  - phase: 18-02
    provides: E2E test patterns for stash
provides:
  - Comprehensive E2E tests for all 6 CHECKOUT requirements
  - Validated checkout command behavior
affects: [phase-19-complete, v1.2-release]

# Tech tracking
tech-stack:
  added: []
  patterns: [pytest class organization by requirement, sl title matching workaround]

key-files:
  created: [tests/test_checkout.py]
  modified: [pytest.ini, tests/test_unsupported.py]

key-decisions:
  - "Use unique filename to avoid sl title matching false positives"
  - "Remove obsolete test_checkout_unsupported now that checkout is supported"

patterns-established:
  - "Filename avoidance for sl title matching: use random-looking names like xyz789data.txt"

# Metrics
duration: 19min
completed: 2026-01-20
---

# Phase 19 Plan 02: Checkout E2E Tests Summary

**E2E tests for git checkout command validating CHECKOUT-01 through CHECKOUT-06 against real Sapling repos**

## Performance

- **Duration:** 19 min
- **Started:** 2026-01-20T01:51:39Z
- **Completed:** 2026-01-20T02:10:12Z
- **Tasks:** 2
- **Files modified:** 3

## Accomplishments
- Created tests/test_checkout.py with 16 comprehensive E2E tests
- Covered all 6 CHECKOUT requirements:
  - CHECKOUT-01: commit hash checkout (full and partial)
  - CHECKOUT-02: branch/bookmark checkout and activation
  - CHECKOUT-03: file checkout without separator
  - CHECKOUT-04: file checkout with -- separator
  - CHECKOUT-05: -b/-B branch creation with optional startpoint
  - CHECKOUT-06: disambiguation detection and resolution
- Registered checkout marker in pytest.ini
- Removed obsolete test_checkout_unsupported (checkout is now supported)
- All 191 tests pass with no regressions

## Task Commits

Each task was committed atomically:

1. **Task 1: Create E2E test file for checkout command** - `56c39cb` (test)
2. **Task 2: Register checkout marker and run tests** - `ee0e61d` (chore)

## Files Created/Modified
- `tests/test_checkout.py` - E2E tests for checkout (246 lines)
- `pytest.ini` - Added checkout marker
- `tests/test_unsupported.py` - Removed obsolete checkout test

## Test Coverage

| Class | Tests | Requirement |
|-------|-------|-------------|
| TestCheckoutCommit | 2 | CHECKOUT-01 |
| TestCheckoutBranch | 2 | CHECKOUT-02 |
| TestCheckoutFile | 3 | CHECKOUT-03, CHECKOUT-04 |
| TestCheckoutCreateBranch | 3 | CHECKOUT-05 |
| TestCheckoutDisambiguation | 4 | CHECKOUT-06 |
| TestCheckoutErrors | 2 | Error handling |

## Decisions Made
- Use unique filenames to avoid sl title matching: Sapling matches filenames to commit messages
- Remove test_checkout_unsupported: Checkout is now a fully supported command

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 1 - Bug] Fixed test_checkout_file_priority false positive**
- **Found during:** Task 2 test execution
- **Issue:** Sapling's title matching feature matched "only-file.txt" to commit message "Add only-file.txt"
- **Fix:** Used unique filename "xyz789data.txt" with generic commit message "Add test file"
- **Files modified:** tests/test_checkout.py
- **Commit:** ee0e61d

**2. [Rule 1 - Bug] Removed obsolete test_checkout_unsupported**
- **Found during:** Task 2 full test suite run
- **Issue:** test_checkout_unsupported failed because checkout is now supported
- **Fix:** Removed the obsolete test
- **Files modified:** tests/test_unsupported.py
- **Commit:** ee0e61d

## Issues Encountered

None - all issues were auto-fixed during execution.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness
- All checkout E2E tests pass
- Phase 19 complete - all 6 CHECKOUT requirements validated
- v1.2 complete - all 40 requirements validated across 5 phases

---
*Phase: 19-checkout-command*
*Completed: 2026-01-20*
