How can i understand parent is file

[Fu, Yong]

When test my code, I found this case failed, but can't understand why a parent 
can be a file(org.apache.hadoop.fs.s3a. ITestS3AMiscOperations
) .

@Test(expected = FileAlreadyExistsException.class)
public void testCreateNonRecursiveParentIsFile() throws IOException {
  Path parent = path("/file.txt");
  ContractTestUtils.touch(getFileSystem(), parent);
  createNonRecursive(new Path(parent, "fail"));
}