import System.Collections.Generic as C

def test_contains():

l = C.List[int]()

l.Add(42)

assert 42 in l

assert 43 not in l

def test_dict_items():

d = C.Dictionary[int, str]()

d[42] = "a"

items = d.items()

assert len(items) == 1

k,v = items[0]

assert k == 42

assert v == "a"

# regression test for https://github.com/pythonnet/pythonnet/issues/1785

def test_dict_in_keys():

d = C.Dictionary[str, int]()

d["a"] = 42

assert "a" in d.Keys

assert "b" not in d.Keys