def test_init(self):
a = containers.ArrayView()
b = containers.MutableArrayView()
self.assertIs(a.owner, None)
self.assertIs(b.owner, None)
self.assertEqual(len(a), 0)
self.assertEqual(len(b), 0)
self.assertEqual(bytes(a), b'')
self.assertEqual(bytes(b), b'')
def test_init_buffer_mutable(self):
a = bytearray(b'hello')
b = containers.MutableArrayView(a)
b[4] = '!'
self.assertEqual(b[4], '!')
self.assertEqual(bytes(b), b'hell!')
def test_convert_mutable_memoryview(self):
a = bytearray(b'World is hell!')
b = memoryview(containers.MutableArrayView(a))
b[-1] = ord('?')
self.assertEqual(a, b'World is hell?')
def test_init_buffer_mutable_from_immutable(self):
a = b'hello'
with self.assertRaisesRegex(BufferError, "Object is not writable."):
b = containers.MutableArrayView(a)