Unit Test Improver

Improve weak unit tests by rewriting them to enforce concrete expectations, proper Arrange/Act/Assert structure, and comprehensive branch coverage for JavaScript and TypeScript projects.

The best way to find missing edge cases in Jest tests is by analyzing assertions against source code to identify coverage gaps, then rewriting the suite to target behavior and explicit edge scenarios.

You need to provide both the test file and the corresponding source file to accurately rewrite incomplete unit tests and ensure new assertions reflect actual code behavior and branches.

You can use this test improvement approach during major code refactors and code reviews to upgrade weak assertions into robust, maintainable suites focused on actual software behavior.

Unit tests often test implementation details instead of behavior due to weak assertions and poor structure, which can be resolved by rewriting suites to follow Arrange/Act/Assert and explicit expectations.