Write tests

[TheJolman]

https://developers.cloudflare.com/workers/testing/vitest-integration/write-your-first-test/

Possible tests (AI generated):

High Priority - Core Business Logic

1. Service Endpoint Tests (packages/service)

These are your critical path - the actual link management logic:

// linkCreate.test.ts

• ✅ Creating link with auto-generated slug
• ✅ Creating link with custom slug
• ✅ Rejecting reserved slugs (links, list)
• ✅ Rejecting duplicate slugs (409 conflict)
• ✅ Validating auth token (401 if missing/wrong)

// linkUpdate.test.ts

• ✅ Updating URL
• ✅ Updating isPermanent flag
• ✅ 404 for non-existent slug

// linkDelete.test.ts

• ✅ Deleting existing link
• ✅ 404 for non-existent slug

// linkRedirect.test.ts

• ✅ 302 redirect for temporary links
• ✅ 301 redirect for permanent links
• ✅ 404 for non-existent slug

Why: These tests protect your data integrity and ensure the API contract. If these break, the whole app breaks.

2. Bot Command Handler Tests (packages/bot)

Test the Discord interaction parsing and routing:

// commands.test.ts

• ✅ Discord signature verification (reject invalid signatures)
• ✅ PING/PONG response
• ✅ Guild ID validation (reject commands from wrong server)
• ✅ URL validation (isValidUrl function)
• ✅ Add command: valid URL
• ✅ Add command: invalid URL
• ✅ Delete command parsing
• ✅ Update command: no modifications provided (error)
• ✅ Unknown subcommand handling

Why: These ensure you handle Discord's webhook correctly and don't expose security vulnerabilities.

Medium Priority - Integration & Utilities

3. Client API Tests (packages/bot/src/client.ts)

Test the HTTP client that talks to your service:

// client.test.ts

• ✅ addLink success (mock fetch)
• ✅ addLink failure handling
• ✅ deleteLink success
• ✅ updateLink success
• ✅ Proper auth header formatting

Why: Validates error handling and ensures bot gracefully handles service failures