self.assertDirContents('dir2', ['thing5.txt', 'thing6.txt', 'dir3'])
self.assertDirContents('dir2/dir3', ['thing7.txt', 'thing8.txt'])
self.assertDirContents('edgecases',
self.assertDirContents('dir2', ['thing5.txt', 'thing6.txt', 'dir3'])
self.assertDirContents('dir2/dir3', ['thing7.txt', 'thing8.txt'])
self.assertDirContents('edgecases',