Setting up Unit Tests

The Unit Test runs a unit testing framework that produces a JUnit XML file with the results of the tests at a location stored in the $CG_JUNIT_XML_LOCATION environment variable.

The resulting score of this test is the fraction of successful tests divided by the total number of tests that were run, multiplied by the weight of the test.

  1. Press the “ Unit Test” button to add a new Unit Test test to your Test Category.

  2. Enter the command that will run your test suite. The command should write a JUnit XML file to the location given in the $CG_JUNIT_XML_LOCATION environment variable.

Compatibility scripts

For most unit testing frameworks it is necessary to install additional software and to figure out how to make the framework output its results to the correct location. We provide wrapper scripts for a growing list of frameworks at our AutoTest Examples GitHub repository that handle all of this for you. Is your preferred testing framework not listed or does a script not work as you need it to? Please send an email to so we can discuss the possibilities!

All wrapper scripts have a similar interface and procedure for running tests. To see the options and commands provided by a script run it with the --help flag.

Initial setup

Upload the wrapper script and the other files in the fixtures subdirectory of the testing framework as fixtures to your AutoTest setup. Also upload the test files that you want to execute as fixtures.

Installing dependencies

If extra software needs to be installed to run the testing framework the wrapper script provides an install command that will install all required dependencies. This should be run in the “Global setup script” section of your AutoTest configuration.

For example, to install JUnit 4 and its dependencies you would run

$FIXTURES/cg-junit install

Compiling code and tests

For compiled languages it can be tricky to get the compiler to find all libraries needed to compile the students’ code and your tests. For these languages the wrapper scripts provide a compile command that configures the compiler to be able to find the required libraries. The compile command takes file names as arguments and compiles those files.

For example, to compile all .java files in the current directory, including a JUnit version 4 test class, you would run

$FIXTURES/cg-junit compile *.java

Running tests

Running the tests can be similarly tricky when a language needs to know about certain locations of libraries it depends on, but also because you need to figure out how you can make the framework output its results in the correct format, or in the correct location. The wrapper scripts handle this in their `run command.

The scripts extract the output location from $CG_JUNIT_XML_LOCATION and then unset it before running the tests. This way students have no access to this information when their code is running. The testing framework is then configured to output its results at that location and the tests are executed.

For example, to run a JUnit 4 test class named MyClass you would run

$FIXTURES/cg-junit run MyClass


The exact arguments to the run command of each script may differ from script to script. They are described in more detail in the readme files accompanying each script.