class_docstr: Test case of valid towhee command
docstr: target: test command 'lsS3' relative path
  method: use lsS3 to list files in S3 relative path without bucket_name
  expected: get correct files
code: def test_command_lsS3_relative_path(self):
      """
      target: test command 'lsS3' relative path
      method: use lsS3 to list files in S3 relative path without bucket_name
      expected: get correct files
      """
      res = os.popen("towhee lsS3 -p test/test.pt").read()
      assert "test.pt" in res
      return True
  
file_path: towhee/tests/testcases/test_command.py
imports: import os
  import sys
  import towhee
label_desc: Use image node_id 1 for calling the TestCommandValid obj's underlying member method code with example usage: obj.test_command_lsS3_relative_path() and returns: True