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Blogs
  Mocking os.stat in Python - 8th of November 2009

I have some code that checks that a file is treated differently if some time has passed. In other words, it reacts if the modification time is more than it was before. The code uses os.stat(filename)[stat.ST_MTIME] to do this. The challenge was to mock os.stat so that I can pretend some time has passed without having to wait. Here was my first solution which made running many tests sloooow:

 def test_file_changed(self):
     filename = 'foo.txt'
     expect_timestamp = int(time.time())
     ...run the unit test with 'expect_timestamp'...
     time.sleep(1)
     expect_timestamp += 1
     ...run the unit test with 'expect_timestamp'...