model {
            lss(CustomSourceSet)
        }
        """

        when:
        succeeds "model"

        then:
        def modelNode = ModelReportOutput.from(output).modelNode
        modelNode.lss.@creator[0] == "lss(CustomSourceSet) @ build.gradle line 13, column 13"
        modelNode.lss.@type[0] == "CustomSourceSet"
    }

        def binary = create(SampleBinary, MySampleBinary, "sampleBinary")
        def customSourceSet = Stub(LanguageSourceSet) {
            getName() >> "custom"
        }
        def inputSourceSet = Stub(LanguageSourceSet) {
            getName() >> "input"
        }

        when:
        binary.sources.put("custom", customSourceSet)

        then:
        binary.sources.values()*.name == ["custom"]

        when:

        when:
        project.sourceSets.create('custom')
        SourceSet customSourceSet = project.sourceSets.custom
        def task = project.tasks['compileCustomScala']

        then:
        task instanceof ScalaCompile
        task.description == 'Compiles the custom Scala source.'
        task.classpath.files as List == [
            customSourceSet.java.destinationDirectory.get().asFile
        ]