python - How to replace file-access references for a module under test -


pyfakefs sounds useful: "was developed modest fake implementation of core python modules support moderately complex file system interactions, , introduced google-wide . . . in september 2006. since then, has received many (well-tested) contributions extend functionality , usefulness, , used in on 900 google python tests."

documentation appears available within docstrings of source code itself. explains module provides following elements:

  • fakefile: provides appearance of real file.
  • fakedirectory: provides appearance of real dir.
  • fakefilesystem: provides appearance of real directory hierarchy.
  • fakeosmodule: uses fakefilesystem provide fake os module replacement.
  • fakepathmodule: faked os.path module replacement.
  • fakefileopen: faked file() , open() function replacements.

documentation not, however, explain how use these elements in testing.

what right way ensure module under test accesses fake filesystem , not real one?

see http://github.com/jmcgeheeiv/pyfakefs code supports both unittest , doctest, plus practical example , tutorial.


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