Change tests to represent behaviour documented in code.

See https://github.com/opentripplanner/OpenTripPlanner/blob/19af62dd0a8621384c00c1004a784d979c251116/src/main/java/org/opentripplanner/routing/edgetype/TripPattern.java#L201

Sorry for messing up the tests again, I'll behave better in the future :(