Method test_io_on_closed_object

Lib/test/test_gzip.py:187–213

(self)

        self.assertEqual(f.read(size), data1)

    def test_io_on_closed_object(self):
        # Test that I/O operations on closed GzipFile objects raise a
        # ValueError, just like the corresponding functions on file objects.

        # Write to a file, open it for reading, then close it.
        self.test_write()
        f = gzip.GzipFile(self.filename, 'r')
        fileobj = f.fileobj
        self.assertFalse(fileobj.closed)
        f.close()
        self.assertTrue(fileobj.closed)
        with self.assertRaises(ValueError):
            f.read(1)
        with self.assertRaises(ValueError):
            f.seek(0)
        with self.assertRaises(ValueError):
            f.tell()
        # Open the file for writing, then close it.
        f = gzip.GzipFile(self.filename, 'w')
        fileobj = f.fileobj
        self.assertFalse(fileobj.closed)
        f.close()
        self.assertTrue(fileobj.closed)
        with self.assertRaises(ValueError):
            f.write(b'')
        with self.assertRaises(ValueError):
            f.flush()

    def test_append(self):
        self.test_write()