Mocking my own service in a unit test

I have a service that takes several of my other services as a dependency. How can I mock it out for a unit test? ``` myApp.factory('serviceToTest', ['serviceDependency', function(serviceDependency) { return function(args) { return cond(args) ? serviceDependency() : somethingElse(); }; } ]); ``` In the above example, I want to mock out `serviceDependency` so I can verify that it was called. How can I do that? I could just do the following in the test: ``` describe("Services", function() { describe('serviceToTest', function() { myApp.factory('serviceDependency', function() { var timesCalled = 0; return function() { return timesCalled++; } }); it('should do foo', inject(function(serviceToTest, serviceDependency) { serviceToTest(["foo", "bar", "baz"]); expect(serviceDependency()).to.equal(1); }); }); }); ``` This works fine for the test that needs the mock, but it then affects the state of all the other tests that follow, which is obviously a problem.