Example of using a Gradle multi-project build to test a Grails plugin and all its test-apps

build.gradle

allprojects {
    task clean << { task ->
        ant.exec(executable: "grails", dir: "$task.project.projectDir", failonerror: true) {
            arg line: "clean"
        }
    }
}

task test << {
    ant.exec(executable: "grails", dir: "$projectDir", failonerror: true) {
        arg line: "test-app unit:"
    }
}

settings.gradle

include "springcache-test", "alt-cache-impl"
project(":springcache-test").projectDir = new File(settingsDir, "test/projects/springcache-test")
project(":alt-cache-impl").projectDir = new File(settingsDir, "test/projects/alt-cache-impl")

springcache-test.gradle

task test << {
    ant.exec(executable: "grails", dir: "$projectDir", failonerror: true) {
        arg line: "test-app integration:"
    }
}