Example on mocking a tempfile

mocking_tempfile.py

import tempfile
import mock
def use_tempfile():
    dest_dir = '/tmp'
    with tempfile.NamedTemporaryFile(dir=dest_dir, delete=False) as temp_dest:
        print "hello world"
        return temp_dest

@mock.patch.object(tempfile, 'NamedTemporaryFile')
def call_use_tempfile(temp_file):
    return use_tempfile()

if __name__ == "__main__":
    print call_use_tempfile()