Mock with jasmine

I want to isolate my angular unit specs.

My code base consists of a factory and a controller:

.factory('ServiceData', ->
    { message: 'im data from a factory service' }
)
.controller('Controller', ['$scope','ServiceData',($scope, ServiceData)->
    $scope.serviceData = ServiceData

And here is a spec for the controller:

it 'should get data from a service', ->
    spyOn(ServiceData, 'message').andReturn('im from a mock') # this doesn't work
    expect($scope.serviceData).toEqual 'im from a mock'

The spec doesn't work, because I get the following error:

ReferenceError: ServiceData is not defined in ...controller_spec.js

I want to isolate my controller spec from my factory. How do I achieve this?

Also, this is a trivial example, but in future I will have very complex factories that get data from the server and all sorts. So I want to know how to stub them out.

I also might want to test how my controller behaves based on different things that are returned by the mocked out function.