Refactor entangled code to improve testability with extraction and wrapping patterns.
npx skills add https://github.com/mgreenly/ikigai --skill testability-mgreenly
Please help me install this Agent Skill. Skill: testability Source: https://github.com/mgreenly/ikigai/tree/main/.claude/library/testability Command: npx skills add https://github.com/mgreenly/ikigai --skill testability-mgreenly
Codebases often suffer from brittle tests and hard-to-maintain logic. This Skill provides patterns to extract pure logic, simplify error handling, and improve testability.
Identify an untestable module and apply the Extract Pure Logic from I/O pattern to create testable boundaries.
High-intent search queries and answers about installing and using this skill.
To improve unit test testability, refactor legacy modules by extracting pure logic from entwined I/O and wrapping dependencies to enable mocking. This isolates business rules from side effects, creating clear boundaries for reliable unit tests.
The best way to unit test code with entwined I/O is applying the Extract Pure Logic pattern to separate business rules from side effects. This refactoring isolates logic into testable functions independent of external systems.
Wrap vendor functions by parameterizing behavior and converting external dependencies to testable interfaces. This allows you to inject mocks during unit testing, isolating the code under test from third-party library side effects.
Unit tests become brittle and hard to maintain when logic is entwined with I/O and unmockable dependencies. Refactoring to extract pure logic and reduce conditional complexity stabilizes tests by isolating deterministic business rules.
Reduce conditional complexity when refactoring for testability by parameterizing behavior and converting infallible functions to void returns. This simplifies error handling paths, making the extracted pure logic easier to test.
Yes, these refactoring patterns are specifically designed for software projects with legacy modules. They provide documented steps to extract pure logic and wrap dependencies, enabling effective mocking where unit tests were previously brittle.
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