This is an example of incorporating Geb into a Gradle build. It shows the use of Spock and JUnit 4 tests.
The build is setup to work with Firefox and Chrome. Have a look at the build.gradle and the src/test/resources/GebConfig.groovy files.
The following commands will launch the tests with the individual browsers:
./gradlew chromeTest
./gradlew firefoxTest
To run with all, you can run:
./gradlew test
Replace ./gradlew with gradlew.bat in the above examples if you're on Windows.