tests/test-atomictempfile.py
author Martijn Pieters <mjpieters@fb.com>
Thu, 23 Jun 2016 17:35:43 +0100
changeset 29391 1acf654f0985
parent 29201 a109bf7e0dc2
child 29392 f21286e48bc6
permissions -rw-r--r--
atomictempfile: use a tempdir to keep the test environment clean Rather than pre-emptively delete a file, execute the test in a dedicated temporary directory that is removed after each test.
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from __future__ import absolute_import
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import glob
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import os
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import shutil
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import tempfile
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import unittest
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from mercurial import (
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    util,
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)
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atomictempfile = util.atomictempfile
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class testatomictempfile(unittest.TestCase):
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    def setUp(self):
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        self._testdir = tempfile.mkdtemp('atomictempfiletest')
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        self._filename = os.path.join(self._testdir, 'testfilename')
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    def tearDown(self):
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        shutil.rmtree(self._testdir, True)
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    def test1_simple(self):
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        file = atomictempfile(self._filename)
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        self.assertFalse(os.path.isfile(self._filename))
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        tempfilename = file._tempname
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        self.assertTrue(tempfilename in glob.glob(
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            os.path.join(self._testdir, '.testfilename-*')))
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        file.write(b'argh\n')
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        file.close()
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        self.assertTrue(os.path.isfile(self._filename))
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        self.assertTrue(tempfilename not in glob.glob(
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            os.path.join(self._testdir, '.testfilename-*')))
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    # discard() removes the temp file without making the write permanent
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    def test2_discard(self):
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        file = atomictempfile(self._filename)
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        (dir, basename) = os.path.split(file._tempname)
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        file.write(b'yo\n')
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        file.discard()
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        self.assertFalse(os.path.isfile(self._filename))
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        self.assertTrue(basename not in os.listdir('.'))
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    # if a programmer screws up and passes bad args to atomictempfile, they
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    # get a plain ordinary TypeError, not infinite recursion
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    def test3_oops(self):
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        self.assertRaises(TypeError, atomictempfile)
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    # checkambig=True avoids ambiguity of timestamp
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    def test4_checkambig(self):
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        def atomicwrite(checkambig):
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            f = atomictempfile(self._filename, checkambig=checkambig)
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            f.write('FOO')
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            f.close()
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        # try some times, because reproduction of ambiguity depends on
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        # "filesystem time"
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        for i in xrange(5):
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            atomicwrite(False)
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            oldstat = os.stat(self._filename)
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            if oldstat.st_ctime != oldstat.st_mtime:
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                # subsequent changing never causes ambiguity
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                continue
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            repetition = 3
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            # repeat atomic write with checkambig=True, to examine
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            # whether st_mtime is advanced multiple times as expecetd
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            for j in xrange(repetition):
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                atomicwrite(True)
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            newstat = os.stat(self._filename)
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            if oldstat.st_ctime != newstat.st_ctime:
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                # timestamp ambiguity was naturally avoided while repetition
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                continue
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            # st_mtime should be advanced "repetition" times, because
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            # all atomicwrite() occured at same time (in sec)
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            self.assertTrue(newstat.st_mtime ==
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                            ((oldstat.st_mtime + repetition) & 0x7fffffff))
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            # no more examination is needed, if assumption above is true
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            break
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        else:
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            # This platform seems too slow to examine anti-ambiguity
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            # of file timestamp (or test happened to be executed at
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            # bad timing). Exit silently in this case, because running
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            # on other faster platforms can detect problems
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            pass
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if __name__ == '__main__':
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    import silenttestrunner
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    silenttestrunner.main(__name__)