Confusion has set in as I try to make sense of this. According to the documentation:
stub.callsArg(index) - This command prompts the stub to execute the callback function found at the specified index. For instance, using stub.callsArg(0); will trigger the first argument as a callback.
Yet, the real mystery lies in locating the list of arguments that can be indexed into. Perhaps my misconception stems from not fully grasping the concept of a stub...
A placeholder is a special type of function that can be customized to behave in a specific way. For example, using callsArg(index) will configure the placeholder to expect a function at a certain index and then immediately execute it.
function greetUser() {
console.log('Hello!');
}
var placeholder = sinon.stub().callsArg(2);
placeholder('abc', 42, greetUser); // outputs "Hello!"
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