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Unit Testing

Test Legacy Code

This project is part of the liveProject series Unit Testing with Java, JUnit 5, and IntelliJ IDEA.
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
1 week · 10 hours per week · INTERMEDIATE

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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.

book resources

When you start your liveProject, you get full access to the following books for 90 days.

project author

Max Guernsey, III
Max Guernsey has over twenty years experience in software development. He has worked on a wide range of products and technologies, including C++ class libraries, financial analysis applications, C# and Java backends, and even multiplatform 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

you will learn

In this liveProject, you’ll learn to extract specification tests from an existing codebase.

  • Deriving tests from existing code
  • Adding test coverage on an as-needed basis
  • Using mutation testing results to guide test efforts

features

Self-paced
You choose the schedule and decide how much time to invest as you build your project.
Project roadmap
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book resources
Get full access to select books for 90 days. Permanent access to excerpts from Manning products are also included, as well as references to other resources.
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