/unit-test

Generate unit tests for a module, covering all public functions and edge cases.

Steps

1. Read the target file and identify all exported functions, classes, and methods.
2. Detect the testing framework from project configuration.
3. For each public function:
   • Analyze parameters, return types, and side effects.
   • Generate tests for the happy path with typical inputs.
   • Generate tests for edge cases: empty inputs, null/undefined, boundary values.
   • Generate tests for error conditions: invalid inputs, thrown exceptions.
   • Mock external dependencies (database, API calls, filesystem).
4. For classes, test:
   • Constructor with valid and invalid arguments.
   • Each public method independently.
   • State transitions and method interactions.
5. Use descriptive test names following the pattern: "should when ".
6. Run the tests to verify they pass.

Format

Generated: <N> unit tests in <file>
Coverage: <functions covered>/<total functions>

Tests:
  - <function>: <N> tests (happy path, edge cases, errors)

Rules

• Test behavior, not implementation details.
• Each test should have exactly one assertion focus (single reason to fail).
• Use realistic test data, not trivial values.
• Mock at module boundaries, not internal functions.
• Keep tests independent; no shared mutable state between tests.