def test_memoize(self):
s = state.State(())
e = s.modify(
lambda t: t + ('modify was called', )
).discard_and_then(effect.success('result')).memoize()
double_e = e.discard_and_then(e)
assert double_e.run(None) == 'result'
assert s.value == ('modify was called', )
def test_try_modify(self):
int_ref = state.State(0)
int_ref.try_modify(lambda _: either.Left('')).either().run(None)
assert int_ref.value == 0
int_ref.try_modify(lambda _: either.Right(1)).run(None)
assert int_ref.value == 1
def test_modify(self):
int_ref = state.State(0)
int_ref.modify(lambda _: 1).run(None)
assert int_ref.value == 1
def test_put(self):
int_ref = state.State(0)
int_ref.put(1).run(None)
assert int_ref.value == 1
def test_get(self):
int_ref = state.State(0)
assert int_ref.get().run(None) == 0