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Phase 1: Transformer Unit Tests - Complete

Summary

Phase 1 of the edge functions testing plan has been successfully completed. All data transformation functions have been extracted into separate, testable modules with comprehensive unit test coverage.

Result: ✅ 67/67 tests passing (100% success rate)

What Was Accomplished

1. Extracted WHOOP Transformers

Created: supabase/functions/sync-whoop/transformers.ts

Extracted transformation logic from sync-whoop/index.ts into a dedicated module:

  • transformWhoopRecovery() - Converts cycle + recovery data to daily_summary
  • transformWhoopSleep() - Converts sleep data to sleep_sessions
  • transformWhoopWorkout() - Converts workout data to activities

Benefits:

  • Pure functions, easy to test
  • Type-safe with exported interfaces
  • Reusable across different contexts
  • Updated sync-whoop/index.ts to import from new module

2. Created Comprehensive Unit Tests

WHOOP Transformer Tests (16 tests)

File: supabase/functions/sync-whoop/transformers.test.ts

Coverage:

  • transformWhoopRecovery (6 tests)

    • Happy path with complete data
    • Missing recovery data handling
    • Zero kilojoules returns 0 (not null) - REGRESSION TEST
    • HRV milliseconds → seconds conversion
    • Missing score data handling
    • Date extraction from ISO timestamps

  • transformWhoopSleep (4 tests)

    • Happy path with complete data
    • Nap handling
    • Missing score data
    • Millisecond → minute conversions

  • transformWhoopWorkout (6 tests)

    • Happy path with complete data
    • Sport ID mapping (10 sport types tested)
    • Duration calculation from timestamps
    • Missing score data handling
    • Zero kilojoules returns 0 - REGRESSION TEST
    • Heart rate zone duration conversions

Fitbit Transformer Tests (28 tests)

File: supabase/functions/_shared/transformers.test.ts

Coverage:

  • transformFitbitDailySummary (5 tests)

    • Happy path with complete data
    • Missing distance data
    • Empty summary
    • Km → meters conversion - REGRESSION TEST
    • Zero value preservation

  • transformFitbitSleep (5 tests)

    • Stages data (deep, light, REM, wake)
    • Classic sleep type
    • Multiple sleep sessions (naps)
    • Empty sleep array
    • Missing levels data

  • transformFitbitActivity (4 tests)

    • Happy path with complete data
    • Missing optional fields
    • Ms → seconds conversion - REGRESSION TEST
    • Km → meters conversion - REGRESSION TEST

  • transformFitbitActivities (4 tests)

    • Deduplication by (start_time, activity_type)
    • Keeps different activities at same time
    • Empty activities array
    • Preserves all unique activities

  • transformFitbitIntradayHeartRate (3 tests)

    • Dataset transformation
    • Empty dataset
    • Missing intraday data

  • transformFitbitIntradaySteps (2 tests)

    • Dataset transformation
    • Empty dataset

  • mergeIntradayData (5 tests)

    • Merges HR and steps by timestamp
    • HR-only data points
    • Steps-only data points
    • Sorts by timestamp
    • Empty arrays

Bugs Found and Fixed

Bug 1: Zero Kilojoules Returns Null Instead of 0

Impact: Data loss - zero calorie activities would show as "no data" instead of "0 calories"

Files Fixed:

  • supabase/functions/sync-whoop/transformers.ts

Changes:

// BEFORE (incorrect)
const caloriesTotal = cycleScore.kilojoule ? Math.round(...) : null;

// AFTER (correct)
const caloriesTotal = cycleScore.kilojoule != null ? Math.round(...) : null;

Why This Matters:

  • 0 is falsy in JavaScript, so kilojoule ? ... treats 0 as "no data"
  • != null correctly distinguishes between 0 (valid) and undefined/null (no data)
  • Applies to: recovery calories, workout calories, heart rate zone durations

Test Execution

Running Tests

cd supabase/functions
./run-tests.sh

Test Breakdown

Test Suite Tests Status
Orchestrator regression 12 ✅ Passing
WHOOP client integration 5 ✅ Passing
Fitbit client integration 6 ✅ Passing
Fitbit transformer unit 28 ✅ Passing
WHOOP transformer unit 16 ✅ Passing
Total 67 ✅ 100%

Performance

  • Runtime: ~145ms for all 67 tests
  • Fast enough for: Pre-commit hooks, CI/CD, watch mode
  • No external dependencies: All tests are pure unit tests

Test Coverage Goals

Phase 1 Coverage Requirements

✅ 100% of transformer functions

  • transformWhoopRecovery ✅
  • transformWhoopSleep ✅
  • transformWhoopWorkout ✅
  • transformFitbitDailySummary ✅
  • transformFitbitSleep ✅
  • transformFitbitActivity ✅
  • transformFitbitActivities ✅
  • transformFitbitIntradayHeartRate ✅
  • transformFitbitIntradaySteps ✅
  • mergeIntradayData ✅

Test Case Types Covered

  1. ✅ Happy path with complete data
  2. ✅ Missing optional fields
  3. ✅ Edge cases (zero, null, empty)
  4. ✅ Unit conversions (kJ → kcal, ms → seconds, km → meters)
  5. ✅ Date/time parsing
  6. ✅ Vendor-specific calculations (HRV, sleep stages, heart rate zones)
  7. ✅ Deduplication logic (Fitbit activities)
  8. ✅ Data merging (intraday HR + steps)

File Structure

supabase/functions/
├── sync-whoop/
│   ├── index.ts                    # Updated to import transformers
│   ├── transformers.ts             # ✨ NEW - WHOOP transformers
│   └── transformers.test.ts        # ✨ NEW - 16 tests
├── _shared/
│   ├── transformers.ts             # Existing Fitbit transformers
│   ├── transformers.test.ts        # ✨ NEW - 28 tests
│   ├── whoop-client-simple.test.ts # Phase 2 (5 tests)
│   └── fitbit-client-simple.test.ts # Phase 2 (6 tests)
├── sync-all-devices/
│   └── orchestrator.test.ts        # Phase 2 (12 tests)
├── run-tests.sh                    # ✅ Updated - includes transformer tests
└── pre-deploy.sh                   # Calls run-tests.sh

Key Principles Applied

1. Pure Functions Are Easy to Test

Transformers are pure functions:

  • Same input → same output (deterministic)
  • No side effects (no API calls, no database access)
  • No external dependencies
  • 100% testable

2. Test Edge Cases, Not Just Happy Paths

Every transformer has tests for:

  • Complete data (happy path)
  • Missing optional fields
  • Empty/zero values
  • Null/undefined handling

3. Regression Tests Prevent Re-introduction of Bugs

Tests marked as "REGRESSION" document actual bugs that occurred:

  • Zero kilojoules → null (now fixed)
  • These tests will fail if the bug is re-introduced

4. Fast Tests Run More Often

  • 145ms runtime means tests can run on every save (watch mode)
  • Pre-commit hooks won't slow down development
  • CI/CD pipeline runs quickly

What This Protects Against

Data Integrity Issues

  1. Zero Value Loss (transformWhoopRecovery, transformWhoopWorkout)

    • Activities with 0 calories would show as "no data"
    • Heart rate zones with 0 minutes would be lost

  2. Unit Conversion Errors

    • Kilojoules → calories (1 kJ = 0.239 kcal)
    • Milliseconds → seconds (HRV, sleep stages)
    • Milliseconds → minutes (sleep durations, zone durations)
    • Kilometers → meters (distance)

  3. Missing Data Handling

    • Recovery data without score
    • Sleep without stage data
    • Workouts without zone durations
    • Activities without distance/calories

  4. Date/Time Parsing

    • Extracting date from ISO timestamps
    • Duration calculations from start/end times
    • Timezone handling

Business Logic Errors

  1. Activity Deduplication (transformFitbitActivities)

    • Keeps activities with same start time but different types
    • Deduplicates true duplicates (same time + same type)
    • Prefers longer duration when deduplicating

  2. Data Merging (mergeIntradayData)

    • Correctly combines heart rate and steps by timestamp
    • Handles missing data points
    • Sorts chronologically

  3. Vendor-Specific Logic

    • WHOOP sport ID → activity type mapping (65+ sport types)
    • Fitbit sleep type detection (stages vs classic)
    • WHOOP nap detection

Next Steps

Phase 2: Integration Tests ✅ COMPLETE

  • WHOOP client tests (5 tests) ✅
  • Fitbit client tests (6 tests) ✅
  • Orchestrator tests (12 tests) ✅

Phase 4: Contract Tests (TODO)

  • Database schema validation
  • Column naming (device_id vs tracker_id)
  • Required fields (user_id in all tables)

Phase 5: CI/CD Integration (TODO)

  • GitHub Actions workflow
  • Pre-commit hooks (optional)
  • Coverage tracking

Running Tests in Different Contexts

Pre-Commit Hook (Optional)

Add to .husky/pre-commit:

# Run edge function tests
cd supabase/functions && ./run-tests.sh

CI/CD Pipeline

- name: Test Edge Functions
  working-directory: supabase/functions
  run: ./run-tests.sh

Watch Mode (Development)

cd supabase/functions
deno test --allow-env --allow-net --watch \
  sync-whoop/transformers.test.ts \
  _shared/transformers.test.ts

Coverage Report

cd supabase/functions
deno test --allow-env --allow-net --coverage=coverage \
  sync-whoop/transformers.test.ts \
  _shared/transformers.test.ts
deno coverage coverage

Success Metrics

Metric Target Actual Status
Test Pass Rate 100% 100% (67/67) ✅
Transformer Coverage 100% 100% (10/10 functions) ✅
Runtime <500ms ~145ms ✅
Reliability No flakes 0 flakes ✅
Bugs Found N/A 1 critical (zero value handling) ✅ Fixed

Conclusion

Phase 1 is now complete with:

  • ✅ 67 tests passing (23 from Phase 2 + 44 from Phase 1)
  • ✅ 100% transformer coverage
  • ✅ Fast execution (~145ms)
  • ✅ 1 critical bug found and fixed
  • ✅ Ready for production use

The transformer tests provide a solid foundation for:

  1. Preventing regressions in data transformation logic
  2. Documenting expected behavior through test cases
  3. Enabling refactoring with confidence
  4. Fast feedback during development

Phase 1 + Phase 2 combined: 67 tests, 100% reliable, ready for CI/CD! 🎉

Last Updated: February 3, 2026 Status: ✅ PHASE 1 COMPLETE