$httpBackend + promise

spec.js

describe('when getting configuration from backend', function () {


        beforeEach(inject(function ($injector) {
            $httpBackend = $injector.get("$httpBackend");
            $httpBackend.expect("GET", "/api/config")
                .respond(200, configMock);
        }));

        afterEach(function () {
            $httpBackend.flush();
            $httpBackend.verifyNoOutstandingExpectation();
            $httpBackend.verifyNoOutstandingRequest();
        });

        it('should read configuration', inject(function (configurationService) {

            configurationService.getConfiguration().then(function(configuration) {
                expect(configuration).toEqual(configMock);
            })

        }));
    });