Method test_resize

Lib/test/test_mmap.py:120–140

(self)

    @unittest.skipUnless(hasattr(mmap.mmap, 'resize'), 'requires mmap.resize')
    def test_resize(self):
        # Create a file to be mmap'ed.
        with open(TESTFN, 'bw+') as f:
            # Write 2 pages worth of data to the file
            f.write(b'\0'* 2 * PAGESIZE)
            f.flush()
            m = mmap.mmap(f.fileno(), 2 * PAGESIZE)
            self.addCleanup(m.close)

        # Try resizing map
        m.resize(512)
        self.assertEqual(len(m), 512)
        # Check that we can no longer seek beyond the new size.
        self.assertRaises(ValueError, m.seek, 513, 0)

        # Check that the underlying file is truncated too
        # (bug #728515)
        with open(TESTFN, 'rb') as f:
            f.seek(0, 2)
            self.assertEqual(f.tell(), 512)
        self.assertEqual(m.size(), 512)

    def test_access_parameter(self):
        # Test for "access" keyword parameter