gen-test

name	gen-test
description	Generate unit tests for a specified module or function
invocation	user
user_invocation	/gen-test

Generate Tests

Generate comprehensive unit tests for the specified module or function. Follow the project's existing test patterns and conventions.

Context

• Test framework: Vitest
• Test file naming: *.test.ts colocated with source
• Packages: @yubot/shared, @yubot/backend, @yubot/agent-runtime, @yubot/mobile
• Run tests: bun run test (all) or bun --filter <package> test (single package)

Steps

1. Read the target module/function specified by the user
2. Identify the public API, edge cases, and error conditions
3. Read 1-2 existing test files to match the project's testing style:
   • packages/backend/src/server.test.ts — Fastify server.inject() pattern
   • packages/shared/src/index.test.ts — simple assertion pattern
4. Generate tests covering:
   • Happy path for each public function/method
   • Edge cases (empty input, null, boundary values)
   • Error conditions (invalid input, thrown exceptions)
   • For agent tools: mock execute params, verify output shape and side effects
5. Write the test file next to the source file (e.g., foo.ts → foo.test.ts)
6. Run bun --filter <package> test to verify the new tests pass

Output Format

Write the test file and report:

• Number of test cases generated
• Coverage areas (happy path, edge cases, errors)
• Any tests that need manual review