private FileCollection resolveLeniently(PropertyValue value) {
        Object sources = value.call();
        return sources == null
            ? FileCollectionFactory.empty()
            : fileCollectionFactory.resolvingLeniently(sources);
    }

    private TestTaskFilters collectFilters(Test task) {
        DefaultTestFilter filter = (DefaultTestFilter) task.getFilter();
        TestFrameworkOptions options = task.getOptions();