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Assertion Helper is a specialized Claude Code skill designed to streamline the testing workflow by automatically generating robust assertions based on code analysis. It evaluates return types, identifies potential side effects, and handles complex scenarios like deep object comparison, mock verification, and asynchronous operations across multiple frameworks including Vitest, Jest, and Pytest. This tool ensures that your tests are not only accurate but also maintainable by following best practices for specific and resilient validation strategies, helping developers catch regressions faster with less manual boilerplate.