*/
protected List<File> calcIncludedFilesForGroovy() {
final MainSourceScanner groovyMainScanner = new MainSourceScanner(this, getProject().getBuild().getOutputDirectory());
final List<File> mainGroovyFiles = extractIncludes(
groovyMainScanner.getSourceFilesToInstrument(LanguageFileExtensionFilter.GROOVY_LANGUAGE, false));
final TestSourceScanner groovyTestScanner = new TestSourceScanner(this, getProject().getBuild().getOutputDirectory());
final List<File> testGroovyFiles = extractIncludes(
groovyTestScanner.getSourceFilesToInstrument(LanguageFileExtensionFilter.GROOVY_LANGUAGE, false));
// combine lists
final List<File> allSources = new ArrayList<File>(mainGroovyFiles);
allSources.addAll(testGroovyFiles);
return allSources;