def off_test_mutate(self, exception):
for _ in range(2):
c = st.Cache()
if c:
c.value = [0, 1]
c.value[0] = 1
exception.assert_called()
def test_mutate_return(self, exception):
@st.cache
def f():
return [0, 1]
r = f()
r[0] = 1
exception.assert_not_called()
r2 = f()
exception.assert_called()
self.assertEqual(r, r2)