Test Scaffold

Generate unit tests for the selected code or file. Follow these steps:

1. Detect the test framework by checking project config files:

   • JavaScript/TypeScript: look for jest.config, vitest.config, .mocharc, or package.json test scripts
   • Python: look for pytest.ini, setup.cfg, pyproject.toml, or unittest usage
   • Go: use the standard testing package
   • Rust: use #[cfg(test)] module with standard assertions
   • Fall back to the most common framework for the language

2. Generate test cases covering:

   • Happy path with typical inputs
   • Edge cases (empty inputs, zero, null/undefined, boundary values)
   • Error cases (invalid inputs, expected exceptions)
   • Return value assertions

3. Follow conventions:

   • Use descriptive test names: test_<function>_<scenario>_<expected>
   • Group related tests in a describe/context block
   • Use the AAA pattern: Arrange, Act, Assert
   • Mock external dependencies; do not make network or filesystem calls
   • Match the project's existing test style if test files already exist

Output only the test file content. Place it in the conventional location for the detected framework.