Jasmine SpyOn same method more than once

I have an angular controller with a method that calls $location.search() twice.

First time is just $location.search() to return the value.
Second time is $location.search("foo", null) to clear it.

I have the following spy in my unit test:
spyOn($location, "search").and.returnValue({ foo: "bar" });

It appears the spy returns {foo:"bar"} even when my implementation does $location.search("foo", null).

I need a way to have two different spies for the same method depending on the arguments.

I need this expect:
expect($location.search().foo).toEqual(null);
to pass at the end of the unit test.