can't create directory in python mac os x

I'm trying to set up a test , but this does not seem to create a directory ('m new to python)
import unittest
import glob
import os

PATH = "extentest"

class FileHandling(unittest.TestCase):

	def setUp(self):
		self.path = PATH
		self.file_names = ["file.ext123", "file.ext123", "file.ext123",
			"file.ext123", "file.ext123", "file.ext223","file.ext223"]
		os.mkdir(self.path)
		for fn in self.file_names:
			f = open(self.path+fn, "w")
			f.close()
	
if __name__ == "__main__":
    unittest.main()

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snigerAsked:
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clockwatcherCommented:
The setUp method is run before each test and your class doesn't have any tests.  Without a test, I can't imagine it would be run.  Try adding a test.
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