how we do spyOn with a function referred in a async call - angularjs

Question

Need help on Jasmine with angularjs :
I created spec for this below angular code. I could able to work with the service, if i don't have a data1 function. I need to know how we do spyOn with a function referred in a async call.
'use strict';
angular.module('myApp.services', [])
.factory("exampleService", function ($http) {
var data1 = function () {
return '/test';
}
return {
data: function () {
return data1();
},
getData: function () {
return $http.get("/exampleUrl" + data1());
}
}
});
Below spec code is
'use strict';
describe('service', function () {
var $httpBackend;
beforeEach(module('myApp.services'));
beforeEach(inject(function ($injector) {
$httpBackend = $injector.get("$httpBackend");
$httpBackend.when("GET", "/exampleUrl/test1")
.respond(200, {
value: "goodValue"
});
}));
afterEach(function () {
$httpBackend.flush();
$httpBackend.verifyNoOutstandingExpectation();
$httpBackend.verifyNoOutstandingRequest();
});
describe('exampleService successful http request', function () {
it('.value should be "goodValue"', inject(function (exampleService) {
spyOn(exampleService, 'data').and.callFake(function () {
//done();
return '/test1';
});
exampleService.getData().success(function (response) {
expect(response.value).toEqual("goodValue");
}).error(function (response) {
//should not error with $httpBackend interceptor 200 status
expect(false).toEqual(true);
});
}));
});
});
But i am getting exception like this
Error : Unexpected Request : GET /exampleUrl/test