Tests for Features.__contains__

Closes #23

test/test_in.py

@@ -4,6 +4,17 @@ def test_contains(features):
     highways = features("w[highway]")
     sushi_restaurants = features("na[amenity=restaurant][cuisine=sushi]")
     restaurant = sushi_restaurants[0]
+    street = highways[0]
     assert restaurant in sushi_restaurants
-    assert highways[0] not in sushi_restaurants
-
+    assert street not in sushi_restaurants
+    for node in street.nodes:
+        assert node in street.nodes
+        assert node not in sushi_restaurants
+
+def test_contains_member(features):
+    routes = features("r[route]")
+    route = routes[0]
+    for member in route.members:
+        assert member in route.members
+        assert route in member.parents
+        assert route in member.parents.relations