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Session Summary: Coverage Reporting & Test Roadmap

Date: 2026-01-23
PR: #420 - Coverage Reporting for PRs
Milestone: #5 - Test Coverage: TUI & Core Libraries

What We Accomplished

1. Fixed Coverage Reporting (PR #420)

Problem: Coverage percentage showed 0% instead of actual coverage.

Root Cause: sed pattern was looking for Coverage: XX.XX% but actual format is Coverage: 6688/11735 (56.99%) with percentage inside parentheses.

Solution: Fixed sed pattern from s/.*Coverage: *\([0-9.]*\)%.*/\1/ to s/.*(\([0-9.]*\)%).*/\1/

Result: ✅ Now correctly displays 56.99% coverage

Commits:

  • 41d366e7 - fix(ci): correct sed pattern to extract coverage percentage
  • 4c9b798f - feat(ci): list files with 0% coverage in report

2. Discovered TRUE Coverage is 27%, Not 57%

The Math:

bisect_ppx report (MISLEADING):
  6,688 / 11,735 points = 56.99%
  (Only 53 executed files counted)

TRUE coverage (ALL FILES):
  6,688 / ~25,000 points = ~26.71%
  (Includes all 103 source files)

HIDDEN: 50 files, 18,770 lines, ~13,000 coverage points

Why: bisect_ppx only reports files that were instrumented AND executed. The entire TUI (50 files) is completely untested and invisible.

3. Created Comprehensive Testing Roadmap

Documents Created:

  1. COVERAGE_PRIORITIES.md - Complete test priority breakdown

    • Phase-by-phase implementation plan
    • Expected coverage improvements
    • Testing patterns from octez-setup
    • Realistic timelines and effort estimates

  2. docs/TUI_TESTING_GUIDE.md - Self-contained testing guide

    • Complete tutorial for TUI testing with Miaou headless driver
    • Pattern library with working code examples
    • Helper function implementations
    • Common scenarios and troubleshooting
    • No dependency on octez-setup - all patterns documented here

  3. SESSION_SUMMARY.md (this file) - Session recap

4. Created Milestone & Issues

Milestone #5: "Test Coverage: TUI & Core Libraries"

Issues Created:

  • #425 - [META] Test Coverage Improvement: 27% → 70% (tracking issue)
  • #421 - test: Add unit tests for registry modules (Phase 1)
  • #422 - test: Add unit tests for CLI progress rendering (Phase 1)
  • #423 - test: Add TUI tests for install node wizard (Phase 2, HIGH IMPACT)
  • #424 - test: Add TUI tests for instances page (Phase 3)

Still needed:

  • System metrics scheduler tests (Phase 1)
  • Install baker/accuser wizards (Phase 2)
  • Form builder tests (Phase 2)
  • Binaries/diagnostics pages (Phase 4)

Coverage Breakdown

Current State (27% TRUE, 57% REPORTED)

Well-Covered (>70%):

  • Service management core: 81-94%
  • Binary registry: 85%
  • Unit tests themselves: 83%
  • Configuration parsing: 74-83%

Completely Untested (0%):

  • All 50 TUI files (18,770 lines)
    • Form wizards: 3,661 lines
    • Instances page: 2,981 lines
    • Binaries page: 894 lines
    • Diagnostics: 1,023 lines
    • Schedulers: 1,500+ lines
    • Other UI: 8,700+ lines

Partially Tested (<50%):

  • CLI commands: 14-47% (tested via integration, not unit)
  • Common utilities: 42%
  • Installers: 23-55%
  • Systemd wrapper: 50%

Target State (70% TRUE, 80% REPORTED)

After completing all 4 phases:

  • Phase 1: 27% → 33% (+6%)
  • Phase 2: 33% → 50% (+17%) - Form wizards, HIGHEST IMPACT
  • Phase 3: 50% → 62% (+12%) - Instances page
  • Phase 4: 62% → 70% (+8%) - Remaining TUI

Total improvement: +43 percentage points TRUE coverage

Testing Architecture

Test Structure

test/
├── unit_tests.ml           # Non-TUI unit tests
├── tui_flow_tests.ml       # TUI flow tests (expand this)
├── tui_test_helpers.ml     # Reusable helpers (expand this)
└── mocks/                  # (to create)
    ├── mock_systemd.ml     # Stub systemd operations
    ├── mock_services.ml    # Test service fixtures
    └── mock_rpc.ml         # Stub RPC responses

Key Testing Patterns

  1. Environment Setup:

    let with_test_env f =
  let tmp = setup_test_env () in
  Fun.protect ~finally:(fun () -> cleanup_test_env tmp) f

  2. Headless Driver:

    HD.set_size 24 80;
HD.Stateful.init (module My_Page);
HD.feed_keys ["Down"; "Enter"];
let screen = HD.get_screen_content () in

  3. Modal Interaction:

    wait_until_modal_active ();
type_text "my-input";
HD.feed_keys ["Enter"];
wait_until_no_modal ();

  4. Screen Assertions:

    assert_contains screen "Expected text";
assert_screen_snapshot expected_output actual;

All patterns fully documented in docs/TUI_TESTING_GUIDE.md.

Implementation Roadmap

Phase 1: Quick Wins (1-2 days, +6% coverage)

Target: Registry modules, CLI progress, system metrics parsing

Why start here:

  • Pure logic, no I/O mocking
  • Fast tests (<1 second)
  • Build confidence with easy wins
  • Establish test patterns

Issues: #421, #422, (create scheduler issue)

Phase 2: Form Wizards (3-5 days, +17% coverage) ⭐ HIGHEST IMPACT

Target: Install node/baker/accuser wizards, form_builder

Why highest impact:

  • 3,661 lines currently untested
  • Core user workflows
  • Tests entire wizard infrastructure
  • Unlocks testing other TUI components

Issues: #423, (create baker/accuser/form_builder issues)

Priority order:

  1. Install node wizard (1217 lines) - #423
  2. Form builder (714 lines) - foundation for all wizards
  3. Install baker wizard (747 lines)
  4. Install accuser wizard (526 lines)

Phase 3: Instances Page (2-3 days, +12% coverage)

Target: Service lifecycle management UI

Why important:

  • 2,981 lines untested
  • Main application interface
  • Critical functionality (start/stop/remove services)

Issues: #424

Phase 4: Remaining TUI (2-4 days, +8% coverage)

Target: Binaries, diagnostics, import wizard

Why last:

  • Lower usage frequency
  • Depends on patterns from Phases 1-3
  • Nice-to-have for 70% target

Issues: (create binaries/diagnostics/import issues)

Key Insights

1. bisect_ppx Hides Untested Code

The default report only shows executed files, creating a false sense of security. Our enhancement to list uncovered files makes the gap visible.

2. TUI Testing is Possible

Miaou's headless driver makes TUI testing straightforward:

  • No real terminal needed
  • Deterministic (no timing issues)
  • Fast (tests complete in ms)
  • Easy to write (just feed keys and check screen)

3. Testing Patterns are Reusable

The same patterns work across all TUI pages:

  • Setup environment
  • Initialize page
  • Feed keys
  • Assert screen content
  • Cleanup

4. Mocking is Essential

Need to stub:

  • Systemd operations (don't create real services)
  • RPC calls (don't need real node)
  • File I/O (use temp directories)
  • Command execution (return canned output)

Next Steps

Immediate (This PR #420)

  1. ✅ Wait for CI to complete (~14 minutes)
  2. ✅ Verify uncovered files listing appears in PR comment
  3. ✅ Merge PR #420 once CI passes
  4. ✅ Coverage reports will auto-post on all future PRs

Short Term (Milestone #5)

  1. Start Phase 1 (1-2 days)

    • Begin with #421 (directory_registry)
    • Then #422 (cli_progress)
    • Create and complete scheduler test issue

  2. Create remaining issues for Phases 2-4

    • Baker wizard test issue
    • Accuser wizard test issue
    • Form builder test issue
    • Binaries page test issue
    • Diagnostics page test issue
    • Import wizard test issue

  3. Expand test infrastructure

    • Add helpers to test/tui_test_helpers.ml
    • Create test/mocks/ directory
    • Build mock library (systemd, rpc, services)

Medium Term (Weeks 2-4)

  1. Execute Phase 2 (form wizards)

    • Highest impact: +17% coverage
    • Establishes patterns for all TUI testing
    • Tests critical user workflows

  2. Execute Phase 3 (instances page)

    • Service management testing
    • Lifecycle operation coverage

  3. Execute Phase 4 (remaining TUI)

    • Complete coverage sweep
    • Hit 70% target

Success Metrics

Coverage Targets:

  • TRUE coverage measured correctly (includes all files)
  • Phase 1 complete: 33% TRUE coverage
  • Phase 2 complete: 50% TRUE coverage
  • Phase 3 complete: 62% TRUE coverage
  • Phase 4 complete: 70% TRUE coverage

Quality Targets:

  • All core workflows tested (install, start, stop, remove)
  • No flaky tests (100 runs, 100% pass rate)
  • Test suite completes in <2 minutes
  • Headless testing patterns documented

Process Targets:

  • Coverage reports auto-post on PRs
  • Uncovered files visible in reports
  • Testing guide available for contributors
  • Test helpers library established
  • Mock infrastructure in place

Files Created/Modified This Session

Created

  • COVERAGE_PRIORITIES.md - Complete roadmap
  • docs/TUI_TESTING_GUIDE.md - Self-contained guide
  • SESSION_SUMMARY.md - This file

Modified

  • .github/workflows/coverage.yml - Fixed % extraction, added uncovered files listing
  • test/unit_tests.ml - (earlier: fixed 17 CI-failing tests)

Issues Created

  • #425 - [META] tracking issue
  • #421 - Registry tests (Phase 1)
  • #422 - CLI progress tests (Phase 1)
  • #423 - Install node wizard tests (Phase 2)
  • #424 - Instances page tests (Phase 3)

Milestone Created

  • #5 - Test Coverage: TUI & Core Libraries

Resources

Conclusion

We've transformed the coverage situation from "looks like 57%, ship it" to "actually 27%, here's a concrete plan to reach 70%".

The roadmap is clear, the patterns are documented, and the issues are ready to be worked. All testing patterns are self-contained in this repository - no need to reference octez-setup, everything needed is in docs/TUI_TESTING_GUIDE.md.

Next session: Execute Phase 1 (quick wins) and start seeing that coverage number climb! 🚀