jasmine toHaveBeenCalledWith partial matching

Question

With Jasmine, I could spy on methods and figure out the arguments. I want to be able to call toHaveBeenCalledWith(something, anything).

Let's say I want to spy on a method .on(event, callback). All I care about is if the event is listened to rather than what the actual callback identity is. Is it possible to do this without writing a custom matcher? I don't see one.

Solution 1

Try

toHaveBeenCalledWith(jasmine.any(Object), jasmine.any(Function))

Solution 2

Jasmine 2:

 expect(callback).toHaveBeenCalledWith(jasmine.objectContaining({
    bar: "baz"
  }));

https://jasmine.github.io/2.0/introduction.html

Solution 3

If you wish to test for specific things, you can do something like:

expect(mockSomething.someMethod.mostRecentCall.args[0].pool.maxSockets).toEqual(50);

The syntax in Jasmine 2 is now:

mockSomething.someMethod.calls.mostRecent().args[0]

Comments

[Michael Freidgeim]

Similar question for jest is stackoverflow.com/questions/52337116/…

[John McCarthy]

Useful for additional optional arguments. Note the syntax in Jasmine 2 is now mockSomething.someMethod.calls.mostRecent().args[0]

[John Neuhaus]

Can also care even less and use jasmine.anything() if the type doesn't matter

[oomer]

let spy = spyOn(nameService, 'getName').and.returnValue(Observable.of('Ali')); nameService.getName('Henry'); expect(spy.calls.all()[0].args[0]).toEqual('Henry');