import os

import glob

from mercurial.util import atomictempfile

# basic usage

def test1_simple():

    if os.path.exists('foo'):

        os.remove('foo')

    file = atomictempfile('foo')

    (dir, basename) = os.path.split(file._tempname)

    assert not os.path.isfile('foo')

    assert basename in glob.glob('.foo-*')

    file.write('argh\n')

    file.rename()

    assert os.path.isfile('foo')

    assert basename not in glob.glob('.foo-*')

    print 'OK'

# close() removes the temp file but does not make the write

# permanent -- essentially discards your work (WTF?!)

def test2_close():

    if os.path.exists('foo'):

        os.remove('foo')

    file = atomictempfile('foo')

    (dir, basename) = os.path.split(file._tempname)

    file.write('yo\n')

    file.close()

    assert not os.path.isfile('foo')

    assert basename not in os.listdir('.')

    print 'OK'

# if a programmer screws up and passes bad args to atomictempfile, they

# get a plain ordinary TypeError, not infinite recursion

def test3_oops():

    try:

        file = atomictempfile()

    except TypeError:

        print "OK"

    else:

        print "expected TypeError"

if __name__ == '__main__':

    test1_simple()

    test2_close()

    test3_oops()