---
phase: 02-e2e-test-infrastructure
plan: 01
subsystem: testing
tags: [pytest, subprocess, fixtures, e2e]

# Dependency graph
requires:
  - phase: 01-script-skeleton
    provides: gitsl.py entry point with CLI structure
provides:
  - CommandResult dataclass for subprocess output capture
  - run_command helper for subprocess execution
  - compare_exact and compare_semantic comparison functions
  - assert_commands_equal for git vs gitsl comparison
  - git_repo fixtures (base, with_commit, with_changes, with_branch)
  - run_git and run_gitsl command runners
affects: [02-02, 02-03, all future test phases]

# Tech tracking
tech-stack:
  added: [pytest]
  patterns: [subprocess capture with dataclass, fixture chaining, pythonpath config]

key-files:
  created:
    - tests/helpers/commands.py
    - tests/helpers/comparison.py
    - tests/conftest.py
    - pytest.ini
    - .gitignore
  modified: []

key-decisions:
  - "Use pytest.ini pythonpath for tests/ module discovery"
  - "Add .gitignore for venv and pycache exclusion"

patterns-established:
  - "CommandResult dataclass for subprocess output"
  - "Fixture chaining: git_repo -> git_repo_with_commit -> git_repo_with_changes"
  - "Helpers in tests/helpers/, fixtures in tests/conftest.py"

# Metrics
duration: 4min
completed: 2026-01-18
---

# Phase 02 Plan 01: E2E Test Infrastructure Summary

**Core test infrastructure with CommandResult dataclass, subprocess helpers, comparison utilities, and 4 git repo fixtures**

## Performance

- **Duration:** 4 min
- **Started:** 2026-01-18T00:26:47Z
- **Completed:** 2026-01-18T00:31:00Z
- **Tasks:** 3
- **Files modified:** 6

## Accomplishments
- CommandResult dataclass capturing stdout, stderr, exit_code with success property
- run_command helper wrapping subprocess.run with env merging
- compare_exact and compare_semantic comparison modes
- assert_commands_equal for golden-master testing git vs gitsl
- 4 pytest fixtures: git_repo, git_repo_with_commit, git_repo_with_changes, git_repo_with_branch
- run_git and run_gitsl helpers for command execution

## Task Commits

Each task was committed atomically:

1. **Task 1: Create command execution helpers** - `ebf628c` (feat)
2. **Task 2: Create output comparison utilities** - `350b9fa` (feat)
3. **Task 3: Create conftest.py with fixtures and runners** - `76b07b8` (feat)

**Plan metadata:** (to be committed after this summary)

## Files Created/Modified
- `tests/__init__.py` - Test package marker
- `tests/helpers/__init__.py` - Helpers subpackage marker
- `tests/helpers/commands.py` - CommandResult dataclass and run_command helper
- `tests/helpers/comparison.py` - Comparison utilities (exact, semantic, diff, assertions)
- `tests/conftest.py` - Pytest fixtures and run_git/run_gitsl helpers
- `pytest.ini` - Pytest configuration with pythonpath
- `.gitignore` - Ignore venv, pycache, IDE files

## Decisions Made
- **pytest.ini with pythonpath:** Configured `pythonpath = tests` so imports like `from helpers.commands import ...` work within conftest.py. This follows pytest conventions.
- **.gitignore:** Added standard Python gitignore entries for venv, pycache, IDE files.

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 3 - Blocking] Created virtual environment for pytest installation**
- **Found during:** Task 3 verification
- **Issue:** System Python was externally managed, couldn't install pytest
- **Fix:** Created .venv with `python -m venv .venv` and installed pytest there
- **Files modified:** .venv/ (not committed)
- **Verification:** Pytest fixtures show correctly in `pytest --fixtures`
- **Committed in:** N/A (venv not tracked)

**2. [Rule 3 - Blocking] Added pytest.ini for pythonpath configuration**
- **Found during:** Task 3 verification
- **Issue:** Pytest couldn't find `helpers` module when running from project root
- **Fix:** Added pytest.ini with `pythonpath = tests` and `testpaths = tests`
- **Files modified:** pytest.ini
- **Verification:** `pytest --fixtures` shows all 4 fixtures correctly
- **Committed in:** 76b07b8 (Task 3 commit)

**3. [Rule 3 - Blocking] Added .gitignore for proper version control**
- **Found during:** Task 3 commit staging
- **Issue:** git add would include .venv and __pycache__ directories
- **Fix:** Created .gitignore with standard Python entries
- **Files modified:** .gitignore
- **Verification:** `git status` shows .venv and __pycache__ as untracked (ignored)
- **Committed in:** 76b07b8 (Task 3 commit)

---

**Total deviations:** 3 auto-fixed (3 blocking)
**Impact on plan:** All auto-fixes were necessary for the tests to function. No scope creep.

## Issues Encountered
None beyond the blocking issues documented above.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness
- Test infrastructure ready for harness validation (02-02)
- Fixtures and helpers available for all future test development
- No blockers or concerns

---
*Phase: 02-e2e-test-infrastructure*
*Completed: 2026-01-18*
