class ClassDocExtensionsBuilderTest extends gradlebuild.docs.XmlSpecification {
    final DslDocModel docModel = Mock()
    final ClassDocExtensionsBuilder builder = new ClassDocExtensionsBuilder(docModel, null)

    def buildsExtensionsForClassMixins() {
        ClassMetaData classMetaData = classMetaData()
        ClassExtensionMetaData extensionMetaData = new ClassExtensionMetaData('org.gradle.Class')
        extensionMetaData.addMixin('a', 'org.gradle.ExtensionA1')