I would use a slightly different approach to delete these specific files.
First, you will want to make a list of the paths to all files. It should look like this:
list = ['17-07-39_03-05-2022_Testing.txt', '16-07-34_03-05-2022_Testing.png', etc.]
Then, you want to search this list for paths that include the string 'testing' and put all these paths in a new list:
testing_list =  for path in list: if path.find('Testing') > 0: testing_list.append(path)
You can now delete all files in the testing_list list. I would use one of the following methods:
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