def test_none_set(self) -> None:
d = DescriptorMemoryElement(0)
self.assertFalse(d.has_vector())
d.set_vector(numpy.ones(16))
self.assertTrue(d.has_vector())
numpy.testing.assert_equal(d.vector(), numpy.ones(16))
d.set_vector(None)
self.assertFalse(d.has_vector())
self.assertIs(d.vector(), None)
def test_output_immutability(self) -> None:
# make sure that data stored is not susceptible to modifications after
# extraction
v = numpy.ones(16)
d = DescriptorMemoryElement(0)
self.assertFalse(d.has_vector())
d.set_vector(v)
r = d.vector()
assert r is not None
r[:] = 0
self.assertEqual(r.sum(), 0)
r_again = d.vector()
assert r_again is not None
self.assertEqual(r_again.sum(), 16)
