def test_buffer_unmap_invalidates(self):
point = dtype([('position', pos), ('UV', uv)])
buf = Buffer()
buf.target = GL.GL_ARRAY_BUFFER
buf[...] = numpy.zeros((20, 5), dtype=point)
m = buf.map()
buf.unmap()
with self.assertRaises(IndexError):
m[0]
with self.assertRaises(IndexError):
m[0] = 1
