VirtualFile child2 = getChildHandler(context, "child2").getVirtualFile();
VirtualFile child3 = getChildHandler(context, "child3").getVirtualFile();
VirtualFile file = VFS.getRoot(context.getRootURI());
MockVirtualFileFilter filter = new MockVirtualFileFilter();
FilterVirtualFileVisitor visitor = new FilterVirtualFileVisitor(filter);
file.visit(visitor);
List<VirtualFile> expected = new ArrayList<VirtualFile>();
expected.add(child1);
expected.add(child2);