then:
        result == fileCollection
        1 * fileCollectionFactory.configurableFiles() >> fileCollection
        1 * fileCollection.from('a', 'b', 'c') >> fileCollection
    }

    def usesFactoryToCreateImmutableFiles() {
        def fileCollection = Mock(FileCollectionInternal)

        when:
        def result = fileOperations.immutableFiles('a', 'b', 'c')

        then:
        result == fileCollection