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A collection of JUnit rules for testing code which uses java.lang.System.

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System Rules

Build Status Linux Build Status Windows

System Rules is a collection of JUnit rules for testing code which uses


System Lambda is an alternative to System Rules that leverages the possibilities of Java 8. It is independent of the test framework. You can use it for example as a replacement for System Rules in JUnit Jupiter and TestNG.


System Rules is available from Maven Central.


Please don't forget to add the scope

if you're using System Rules for tests only.


System Rules' documentation is stored in the

branch and is available online at


You have three options if you have a feature request, found a bug or simply have a question about System Rules.

Development Guide

System Rules is build with Maven. If you want to contribute code than

  • Please write a test for your change.
  • Ensure that you didn't break the build by running
    mvnw test
  • Fork the repo and create a pull request. (See Understanding the GitHub Flow)

The basic coding style is described in the EditorConfig file


System Rules supports Travis CI (Linux) and AppVeyor (Windows) for continuous integration. Your pull request will be automatically build by both CI servers. On Travis CI we build your pull request with OpenJDK 6 and run test with different JDKs (Java 6 to 10).

Release Guide

  • Select a new version according to the Semantic Versioning 2.0.0 Standard.
  • Set the new version in
    and in the
    section of this readme.
  • Commit the modified
  • Run
    mvnw clean deploy
    with JDK 6 or 7.
  • Add a tag for the release:
    git tag system-rules-X.X.X

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