Method test_UnsupportedOperation

Lib/test/test_zstd.py:2356–2383

(self)

        self.assertEqual(dat, SAMPLES[0])

    def test_UnsupportedOperation(self):
        # 1
        with ZstdFile(io.BytesIO(), 'r') as f:
            with self.assertRaises(io.UnsupportedOperation):
                f.write(b'1234')

        # 2
        class T:
            def read(self, size):
                return b'a' * size

        with self.assertRaises(TypeError): # on creation
            with ZstdFile(T(), 'w') as f:
                pass

        # 3
        with ZstdFile(io.BytesIO(), 'w') as f:
            with self.assertRaises(io.UnsupportedOperation):
                f.read(100)
            with self.assertRaises(io.UnsupportedOperation):
                f.seek(100)
        self.assertEqual(f.closed, True)
        with self.assertRaises(ValueError):
            f.readable()
        with self.assertRaises(ValueError):
            f.tell()
        with self.assertRaises(ValueError):
            f.read(100)

    def test_read_readinto_readinto1(self):
        lst = []