# Implementation Plan: Fix Tests and Playground Components

## Goal
1. Fix the malformed `SleepTimetable.test.tsx`.
2. Resolve console errors in `WakeupPlot` and `BedtimePlot` playground components.
3. Ensure 100% test pass rate using TDD.

## Phase 1: Fix Malformed Test File
- **Action:** Clean up `frontend/tests/unit/components/stats/SleepTimetable.test.tsx` by removing duplicated and malformed test blocks.
- **Verification:** Run `npm run test` to ensure the parse error is resolved and existing tests pass.

## Phase 2: Fix Playground Components (`WakeupPlot`, `BedtimePlot`)
- **Investigation:** 
    - Examine `frontend/src/utils/time.js` to find the `split` error in `timeToMinutes`.
    - Trace calls from `frontend/src/components/stats/WakeupPlot.js` and `frontend/src/components/stats/BedtimePlot.js`.
- **Resolution:** Fix the `undefined` value being passed to time utilities, ensuring components load in the playground without console errors.
- **Verification:** Validate via component tests and ensure no regressions.

## Phase 3: Final TDD Verification
- **Mandatory Loop:** 
    1. Run `npm run test`.
    2. Run `npm run test:all`.
- **Requirement:** Iterate until all tests pass flawlessly (100% success) and the component fixes are verified. No task is complete until both commands return zero errors.