I have a function that looks roughly like this:
import {someLibraryMethod} from 'someLibrary';
function setFullWidth(el) {
someLibraryMethod(el);
el.setAttribute('width', '100%');
}
I'm testing this function by using Sinon to create a mock element that only supports setAttribute
:
const fakeElement = {
setAttribute: sinon.spy()
};
setFullWidth(fakeElement);
assert(fakeElement.setAttribute.calledWithExactly('width', '100%'));
The problem is that someLibraryMethod
assumets el
is an HTML element and tries to call some other methods on it, such as hasAttribute
. I could add these as stubs or spies to fakeElement
too, but I was wondering if Sinon has a way to create an object that will spy on any method or property access on it?
Something like:
const fakeElement = sinon.spyOnAnyPropety();
fakeElement.setAttribute(); // valid
fakeElement.hasAttribute(); // valid
fakeElement.foo(); // also valid
// some way to check which methods were called
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