docstr: Tests False is returned when there are no keys for the prefix. Ie. no artifact to download
docstr_tok: ["Tests","False","is","returned","when","there","are","no","keys","for","the","prefix",".","Ie",".","no","artifact","to","download"]
code: def test_try_s3_download_returns_false_on_no_keys(self, mock_s3):
      """
      Tests False is returned when there are no keys for the prefix. Ie. no artifact to download
      """
      key_prefix = "some/key/prefix"
      mock_s3.list_objects_v2.return_value = {"KeyCount": 0}
      self.assertFalse(
          try_s3_download(
              bucket="bucket", s3_key_prefix=key_prefix, destination=""
          )
      )
  
imports: import unittest
  from unittest.mock import MagicMock, mock_open, patch
  from artifact_repository import *
label_desc: Use image node_id 30 for calling the TestArtifactRepositoryTool obj's underlying member method code with example usage: obj.test_try_s3_download_returns_false_on_no_keys(mock_s3) without return types