Spy a method having multiple arguments and a callback

Question

I have a method like below

service.myMethod(reqBody,true, false, false, (success) => {

    },(failure)=>{

    });

I want to spy on this method and want to mock the success callback and I have tried the following

const service = TestBed.get(Service);
spyOn(service, 'myMethod').and.callFake(function (reqBody, success,error) {
        return success({});
    });

Its throwing success is not a function. Also tried the following

spyOn(service, 'myMethod').and.callFake(function (reqBody,true,false,false, success,error) {
        return success({});
    });

Its showing compilation error.

Your fake call is missing the 3 boolean parameters between `reqBody` and the callback. — Madara's Ghost, Sep 13 '18 at 07:57
Got the solution. Refer to https://github.com/jasmine/jasmine/issues/1603 — Swayangjit, Sep 16 '18 at 08:57

score 0 · Answer 1 · answered Oct 19 '19 at 11:49

In the following solution boolean1, boolean2, boolean3 will receive the values "true, false, false", but you cannot define the values on the function level.

spyOn(service, 'myMethod').and.callFake(function (reqBody, boolean1, boolean2, boolean3, success, error) {
    return success({});
});

score 0 · Answer 2 · answered Oct 19 '19 at 14:39

Spying doent work that way, its going to search for the success(), which obviously is not available in your code. The dependencies don't get loaded here means the service is working as an independent component.

To test the service please write the test for the service seperately, here what you can do is to use .and.returnvalue() or .and.returnvalues() instead this will return what ever you want. Please check its documentation to get a better idea (https://jasmine.github.io/2.0/introduction.html#section-Spies:_%3Ccode%3Eand.returnValue%3C/code%3E)

Else write a public success function in your test file above and declare it as public.

try to read the complete code, success is available in the method argument. — Swayangjit, Oct 19 '19 at 16:20

Spy a method having multiple arguments and a callback

2 Answers2