import unittest
import os
from os import path
import shutil
import tempfile


class TestOS(unittest.TestCase):
    def setUp(self):
        self.tmp = tempfile.mkdtemp()
        self.tmp_fd = os.open(self.tmp, os.O_DIRECTORY)

    def tearDown(self):
        os.close(self.tmp_fd)
        shutil.rmtree(self.tmp)

    def test_rename(self):
        foo = path.join(self.tmp, 'foo')
        bar = path.join(self.tmp, 'bar')
        baz = path.join(self.tmp, 'bar', 'baz')
        os.mkdir(foo)
        os.mkdir(bar)
        open(baz, 'xb').close()
        with self.assertRaises(OSError) as cm:
            os.rename(foo, bar)
        self.assertEqual(str(cm.exception),
            '[Errno 39] Directory not empty: {!r}'.format(bar)
        )

    def test_rename_with_dir_fd(self):
        foo = path.join(self.tmp, 'foo')
        bar = path.join(self.tmp, 'bar')
        baz = path.join(self.tmp, 'bar', 'baz')
        os.mkdir(foo)
        os.mkdir(bar)
        open(baz, 'xb').close()
        with self.assertRaises(OSError) as cm:
            os.rename('foo', 'bar',
                src_dir_fd=self.tmp_fd,
                dst_dir_fd=self.tmp_fd,
            )
        self.assertEqual(str(cm.exception),
            "[Errno 39] Directory not empty: 'bar'"
        )


if __name__ == '__main__':
    unittest.main()