def test_mutate_args(self, exception):
@st.cache
def foo(d):
d["answer"] += 1
return d["answer"]
d = {"answer": 0}
self.assertNotEqual(foo(d), foo(d))
exception.assert_not_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)
def test_args(self, exception):
called = [False]
@st.cache
def f(x):
called[0] = True
return x
self.assertFalse(called[0])
f(0)
self.assertTrue(called[0])
called = [False] # Reset called
f(0)
self.assertFalse(called[0])
f(1)
self.assertTrue(called[0])
exception.assert_not_called()