Introducing fakefs, easy faking the file system.

Easily dictate how the files system is supposed to behave during tests. Benefits:

• All in memory - Very fast.
• Unit tests does not mess with your harddrive needlessly, leave stray files around and shit. Nice and tidy.
• Minute control - Decide whether a file should exist or not, and what contents it should have
• Possible to assert on file contents when e.g. writing files.
• All patching can be done with the included monkey patcher.
• Batteries not included.

fs = FakeFilesystem()
fs.add_file('file.txt', data='contents goes here')
with fs.monkey.patch():
    # Production code
    with open('file.txt') as f:
        print(f.read())

Samuel Carlsson [email protected]