def test_lookup():
assert Matcher.lookup("username", {"username": "******"}, {}) == "kernel"
assert Matcher.lookup("msg", {"username": "******", "msg": "hello"}, {}) == "hello"
assert Matcher.lookup("data", {"msg": "something"}, {}) == {}
assert Matcher.lookup("data", {"msg": "something"}, {"hello": "world"}) == {"hello": "world"}
assert Matcher.lookup("data.key", {"msg": "something"}, {"key": "value"}) == "value"
assert Matcher.lookup("data.hello", {"msg": "something"}, {"hello": "world"}) == "world"
with pytest.raises(KeyError):
Matcher.lookup("msg", {}, {})
with pytest.raises(KeyError):
Matcher.lookup("msg", {}, {"msg": "value"})
with pytest.raises(KeyError):
Matcher.lookup("msg", {"username": "******"}, {})
with pytest.raises(KeyError):
Matcher.lookup("data.username", {"username": "******"}, {})
