Overview

The Major mutation framework enables efficient mutation analysis of large software systems as well as fundamental research on mutation testing. Major provides the following three components:

Compiler-integrated mutator for easy and fast fault seeding
Domain specific language to configure the mutation process in detail
Mutation analyzer for JUnit tests

Generate mutants

Major provides a lightweight and easy to use mutator, which is integrated in the OpenJDK Java compiler.

Generate and compile mutants

$javac -XMutator:ALL MyFile.java
#Generated Mutants: 190 (96 ms)

Generate mutated source files

$javac -J-Dmajor.export.mutants=true -XMutator:ALL MyFile.java
#Generated Mutants: 190 (223 ms)

Mutation analysis

The generated and embedded mutants can be used in any Java-based environment. Major provides a default mutation analyzer for JUnit tests that builds on top of Apache Ant.

Apache Ant

Create target for mutation analysis

<target name="mutation.test">
  <junit mutationAnalysis="true">
    <classpath="build"/>
    </batchtest>
      <fileset dir="test">
        <include name="**/*Test.java"/>
      </fileset>
    </batchtest>
  </junit>
</target>

Run mutation analysis

$ant mutation.test

The Major mutation framework

Easy and scalable mutation testing for Java!