Having in javascript
class GrandParent {
myfunc() {
console.log('Parent myfunc');
}
}
class Parent extends GrandParent {
myfunc() {
// do something else here
for (let i = 0; i < 3; i++) {
super.myfunc()
}
}
}
class Child extends Parent {
mymeth() {
// do something here
this.myfunc();
}
}
let spy = sinon.spy(Child.<?>, "myfunc")
let child = new Child();
child.myfunc();
console.log(spy.callCounts); --> 3 expected
I have only access to Child class (through a require which exports only this class, this must not be changed) and I would like to spy the myfunc() method from GrandParent class in order to get spy.callCounts === 3 finally.
Is it possible to do and how?
Thanks in advance
You need to stub on GrandParent.prototype.
Also, for safety reasons, it's better to first install spies/stubs, then create objects:
If it's not accessible by imports, you can use reflection (in this case "twice":
const parentConstructor = Reflect.getPrototypeOf(Child)
const grandpaConstructor = Reflect.getPrototypeOf(parentConstructor);
let spy = sinon.spy(grandpaConstructor.prototype, "myfunc")
let child = new Child();
child.myfunc();