doLast {
                println "Pinging: " + (taskName - 'ping')
            }
        }
    }
}
// end::task-rule[]

tasks.register('groupPing') {
    dependsOn 'pingServer1', 'pingServer2'
}

            doLast {
                println("Pinging: " + (taskName.replace("ping", "")))
            }
        }
    }
}
// end::task-rule[]

tasks.register("groupPing") {
    dependsOn("pingServer1", "pingServer2")
}

executable: gradle
args: pingServer1
flags: --quiet

        def dependencies = to.collect {
            "pingServer.dependsOn(':${it}:pingServer')"
        }.join('\n')

        buildFile << """
project(':$from') {
    ${dependencies}
}
"""
    }

    def failingBuild(def project) {
        def failure = "$project failed"
        buildFile << """
project(':$project') {
    pingServer.doLast {
        throw new RuntimeException('$failure')
    }