How to spy a function without root object

[Hoàng Ngọc Dũng]

Hi friends
I got a case

import velocity from 'velocity-animate';

export function slideDown(element, callback) {
    velocity(element, 'slideDown', {
        duration: 250,
        complete: callback
    });
}

spyOn('velocity');

I can't spy a single function in this case. Please help me !

[Gregg Van Hove]

In a browser type environment you would probably do something like:

`spyOn(window, 'velocity')`

because that's where any global functions would actually be living. In a CommonJS environment, you should be able to use `global` instead of `window` to accomplish the same thing.

Hope this helps. Thanks for using jasmine!

-Gregg

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[Hoàng Ngọc Dũng]

Sorry and how about for the case we have our own function from our module, and it is not attached with global/window.

- utils.js

export function getProducts() {};
export function getCategories() {};

- stores.js

import {getProducts} from './utils';

export default {
   trick() {
      let total = getProducts();

      if (total) { //do something}
      else {} { // do something}
   }
};

- stores-test.js

import { getProducts } from './utils';
import stores from './stores';

it('Should Test', () => {
   spyOn(getProducts).and.returnValue('5');
});


[Gregg Van Hove]

The `spyOn` function works by replacing the original function on the owning object with a Spy object. So if there is no owner object, you can't use `spyOn`. You could look into using `jasmine.createSpy` to get a raw Spy object back, but since jasmine won't know what you're doing with it, it is unable to clean up the way that `spyOn` does.

Hope this helps.

-Gregg