🟠 MEDIUM: Add comprehensive tests for Letter component

[isaaceliape]

Story Points

4

User Story

As a developer,
I want to add comprehensive tests for the Letter component,
So that I can ensure letter rendering, styling, and state management is reliable.

Description

Create comprehensive unit tests for the Letter.vue component covering letter display, status styling (correct/incorrect/pending), class application, prop handling, and component re-renders.

Acceptance Criteria

• Test file created with 10+ test cases
• Letter rendering verified
• Status classes tested (correct/error/pending)
• Font styling applied correctly
• Props handling tested
• Store integration verified
• Code coverage >= 75%
• All tests passing

Implementation Plan

Step 1: Analyze Component (Day 1)

• Review Letter.vue implementation
• Understand letter states and styling
• Map all possible prop combinations
• Document CSS classes

Step 2: Create Test Structure (Day 1-2)

• Set up test file
• Create component mounts
• Create letter fixtures
• Set up store mocking

Step 3: Write Tests (Days 2-3)

• Rendering: Letter displays correctly
• Text Content: Letter text renders
• Status Classes: All status classes apply
• Styling: Font size and style correct
• Props: Handle all prop combinations
• Store: Read store styling correctly
• Re-renders: Handle prop updates

Step 4: State & Styling Tests (Day 3-4)

• Correct letter styling
• Error letter styling
• Pending letter styling
• Font size changes
• Dark mode styling
• Cursor position styling

Step 5: Coverage & Optimization (Day 4)

• Run coverage report
• Achieve 75%+ coverage
• Test all letter states
• Optimize performance

Related Issues

• Phase 3: Component Testing