🐛 [BUG] 9 Test Failures - Tests out of sync with UI

[codeme-ne]

Problem

Running npm test results in 9 test failures across 5 test suites.

Evidence

$ npm test

Test Suites: 5 failed, 2 passed, 7 total
Tests:       9 failed, 43 passed, 52 total

Failed Test Suites:

1. jest.setup.test.js
2. __tests__/config/environment.test.ts
3. __tests__/Home.test.tsx
4. __tests__/components/ChatInterface.test.tsx
5. __tests__/components/FileUpload.test.tsx

Root Cause Analysis

Tests are out of sync with the actual UI:

Test expects: "Dokument zum Lernen hochladen"
UI shows:     "Datei hochladen"

The component text was changed but tests weren't updated.

Working Checks

• ✅ npm run build - Succeeds
• ✅ npm run type-check - Succeeds
• ✅ Live demo works: https://checkst-bot.vercel.app

Required Fixes

1. FileUpload.test.tsx

Update text matchers to match current UI:

// Before
expect(screen.getByText(/Dokument zum Lernen hochladen/i)).toBeInTheDocument();

// After
expect(screen.getByText(/Datei hochladen/i)).toBeInTheDocument();

2. Review All Failed Tests

Each failed test needs to be checked against the current UI/behavior.

3. Consider Test Refactoring

• Use data-testid attributes instead of text matching
• This prevents tests from breaking when UI text changes

Impact

HIGH - Failing tests make CI/CD unreliable and signal poor code quality to recruiters reviewing the repo.

Priority

P1 - Must fix before showcasing as portfolio project.

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This issue was created as part of portfolio cleanup for AI Automations SE applications.