Jasmine. Angular Services. Angular Promises. How to make them play together? - angularjs

Question

I was following this example.
We have test suite like:
describe('Basic Test Suite', function(){
var DataService, httpBackend;
beforeEach(module('iorder'));
beforeEach(inject(
function (_DataService_, $httpBackend) {
DataService = _DataService_;
httpBackend = $httpBackend;
}
));
//And following test method:
it('should call data url ', function () {
var promise = DataService.getMyData();
promise.then(function(result) {
console.log(result, promise); // Don't gets here
}).finally(function (res) {
console.log(res); // And this is also missed
})
})
});
How to make jasmine + karma work with angular services, that returns promise?
I have seen this question, but looks like it's about using promises in test cases. Not about testing promises.

Answer 1

You need to tell jasmine that your test is asynchronous so that it waits for the promises to resolve. You do this by adding a done parameter to your test:
describe('Basic Test Suite', function(){
var DataService, httpBackend;
beforeEach(module('iorder'));
beforeEach(inject(
function (_DataService_, $httpBackend) {
DataService = _DataService_;
httpBackend = $httpBackend;
}
));
//And following test method:
it('should call data url ', function (done) {
var promise = DataService.getMyData();
promise.then(function(result) {
console.log(result, promise); // Don't gets here
done();//this is me telling jasmine that the test is ended
}).finally(function (res) {
console.log(res); // And this is also missed
//since done is only called in the `then` portion, the test will timeout if there was an error that by-passes the `then`
});
})
});
By adding done to the test method, you are letting jasmine know that it is an asynchronous test and it will wait until either done is called, or a timeout. I usually just put a call to done in my then and rely on a timeout to fail the test. Alternatively, I believe you can call done with some kind of error object which will also fail the test, so you could call it in the catch.