Generic methods cannot be mocked easily

[jjherscheid]

When objects have generic methods it is not easy to mock.
For now you must use the following syntax:

mf.setup(f => f.fightersGeneric).Spy.and.returnValue('tada');

or use the spyOf method to use a spy.

But still looking for other solution to be typesafe....

[ike18t]

Aww man... you lose type safety. I'd rather:
const mock = new Mock({fightersGeneric: function(arg: T) { return {} as T} });

[jjherscheid]

I was just looking for a solution... I could not found anything working...
Will your solution work?
.... (testing....)
It seems to be working, but still not real ellegant ;-)

[jjherscheid]

This will also work.. Is the same as @ike18t but with arrow function:
const mock = new Mock({ fightersGeneric: (arg: T) => ({} as T) })

[jjherscheid]

Problem is with both solutions is that when you fill in the {} with params... Like:

[ike18t]

I can't see the rest of the code. That definitely would cause an error though being that T is not defined to extend anything and you are casting an object with properties declared.

[jjherscheid]

Basically someone in trying to mock the new HttpClient from Angular 4+ this has a method get< T > which returns Observable<HttpEvent< T >>.

get<T>(url: string, options: { headers?: HttpHeaders | {[header: string]: string | string[]}, observe: 'events', params?: HttpParams|{[param: string]: string | string[]}, reportProgress?: boolean, responseType?: 'json', withCredentials?: boolean, }): Observable<HttpEvent<T>>;

So T has no definition and can't be converted to anything.
Maybe I am missing something.. But I created this Issue to think about a (hopefully) typesafe solution to test methods like this ;-)...

It does not have to be fixed right away. :D

[ike18t]

Using ts-mocks seems like the wrong tool to use for that job. Angular provides test helpers for mocking out http requests.
https://angular.io/api/http/testing/MockBackend

[jjherscheid]

Ha, yes I know.. I also told that ;-). But this triggered me to think about generic methods :D