import os

import glob

import unittest

import silenttestrunner

from mercurial.util import atomictempfile

class testatomictempfile(unittest.TestCase):

    def test1_simple(self):

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

            os.remove('foo')

        file = atomictempfile('foo')

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

        self.assertFalse(os.path.isfile('foo'))

        self.assertTrue(basename in glob.glob('.foo-*'))

        file.write('argh\n')

        file.close()

        self.assertTrue(os.path.isfile('foo'))

        self.assertTrue(basename not in glob.glob('.foo-*'))

    # discard() removes the temp file without making the write permanent

    def test2_discard(self):

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

            os.remove('foo')

        file = atomictempfile('foo')

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

        file.write('yo\n')

        file.discard()

        self.assertFalse(os.path.isfile('foo'))

        self.assertTrue(basename not in os.listdir('.'))

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

    # get a plain ordinary TypeError, not infinite recursion

    def test3_oops(self):

        self.assertRaises(TypeError, atomictempfile)

if __name__ == '__main__':

    silenttestrunner.main(__name__)