}

    @Test void appliesMappingsToNewSourceSet() {
        def sourceSet = project.sourceSets.create('custom')
        assertThat(sourceSet.groovy.displayName, equalTo("custom Groovy source"))
        assertThat(sourceSet.groovy.srcDirs, equalTo(toLinkedSet(project.file("src/custom/groovy"))))
    }

    @Test void addsCompileTaskToNewSourceSet() {
        project.sourceSets.create('custom')

        def classpathFiles = classpath.files
        // ...
    }
}
// end::task-type[]

tasks.register("someTaskType", SomeTask) {
    classpath.from(sourceSets.main.compileClasspath)
}

// tag::ad-hoc-task[]
tasks.register('someTask') {
    def classpath = sourceSets.main.compileClasspath // <1>
    doLast {
        def classpathFiles = classpath.files
    }
}

    // Groovy only needs the declared dependencies
    // (and not longer the output of compileJava)
    classpath = sourceSets.main.compileClasspath
}
tasks.named('compileJava') {
    // Java also depends on the result of Groovy compilation
    // (which automatically makes it depend of compileGroovy)
    classpath += files(sourceSets.main.groovy.classesDirectory)
}

dependencies {
    testImplementation("junit:junit:4.13")
}

// tag::custom-src-dirs[]
sourceSets {
    main {
        java {
            setSrcDirs(listOf("src"))
        }
    }

    test {
        java {
            setSrcDirs(listOf("test"))
        }
    }
}
// end::custom-src-dirs[]

// tag::custom-extra-src-dir[]
sourceSets {
    main {
        java {
            srcDir("thirdParty/src/main/java")

        given:
        buildFile << """
            plugins {
                id("java-base")
            }

            sourceSets {
                sources
            }

            task verify {
                assert sourceSets.sources.output.classesDirs instanceof ConfigurableFileCollection
            }
        """

        expect:
        succeeds "verify"
    }

    mavenCentral()
}

task compileWithOptimization(type: GroovyCompile) {
    source = sourceSets.main.groovy
    classpath = configurations.compileClasspath
    destinationDirectory = file("$buildDir/classes/optimized")
    groovyOptions.optimizationOptions["int"] = true
}

task compileWithoutOptimization(type: GroovyCompile) {
    source = sourceSets.main.groovy
    classpath = configurations.compileClasspath

dependencies {
    testImplementation 'junit:junit:4.13'
}

// tag::custom-src-dirs[]
sourceSets {
    main {
         java {
            srcDirs = ['src']
         }
    }

    test {
        java {
            srcDirs = ['test']
        }
    }
}
// end::custom-src-dirs[]

// tag::custom-extra-src-dir[]
sourceSets {
    main {
        java {
            srcDir 'thirdParty/src/main/java'
        }

    mavenCentral()
}

task compileWithOptimization(type: GroovyCompile) {
    source = sourceSets.main.groovy
    classpath = configurations.compileClasspath
    destinationDirectory = file("$buildDir/classes/optimized")
    groovyOptions.optimizationOptions.indy = true
}

task compileWithoutOptimization(type: GroovyCompile) {
    source = sourceSets.main.groovy
    classpath = configurations.compileClasspath

            }

            java {
                sourceSets {
                    withoutSources
                }
                registerFeature("withoutSources") {
                    usingSourceSet(sourceSets.withoutSources)
                }
            }

            java {
                sourceSets {
                    withSources
                }

            plugins {
                id 'java'
            }

            sourceSets {
                one {}
                onePref {}
                two {}
                twoPref {}
            }

            java {
                registerFeature('one') {
                    usingSourceSet(sourceSets.one)
                    capability('o', 'n', 'e')
                    capability('g', 'one', 'v')