Test Legacy Code

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prerequisites
intermediate Java • JUnit 5
skills learned
deriving tests from existing code • adding test coverage on an as-needed basis • using mutation testing results to guide test efforts
Max Guernsey, III
1 week · 10 hours per week · INTERMEDIATE
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Look inside
In this liveProject, you’ll set up tests to support refactoring of a legacy library. As you lack a written specification, you’ll use “pinning tests” to extract a specification from the existing code, and generate a wide range of test coverage. You’ll learn to spot when and where to improve code maintainability, and set up mutation testing to ensure your tests catch unintended changes.
This project is designed for learning purposes and is not a complete, production-ready application or solution.

project author

Max Guernsey, III

Max Guernsey has over twenty years of experience in software development and is currently a managing member at DevCraft LLC. He has worked on a wide range of products and technologies, including C++ class libraries, financial analysis applications, C# and Java backends, and even multi-platform video games. He is an experienced consultant and his "coaching from the keyboard" approach provides hands-on experience to learners in all aspects of modern software development.

prerequisites

This liveProject is for Java developers who want to increase their testing capabilities. To begin this liveProject you will need to be familiar with:

  • Intermediate Java
  • JUnit 5

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