If you want to use the text version of the exercises and solutions (rather than the EDU version that runs inside IntelliJ IDEA):
Download and unpack the current release
To check output and 'eq' for examples and exercise solutions, run gradlew TestExamples.
To test the exercises against their given solutions, run gradlew TestExercises.
After cloning, open as a project in Intellij IDEA with the EDU extension installed.
When you make changes, you might need to rerun Gradle to build the project:
gradlew build -x test