Here's my callnapply.js file

const callAndApply = {

  caller(object, method, nameArg, ageArg, tShirtSizeArg) {

    method.call(object, nameArg, ageArg, tShirtSizeArg);

  },

  applier(object, method, argumentsArr) {

    method.apply(object, argumentsArr);

  },

};

module.exports = callAndApply;

And here's a snippet from the test file which contains the non-working test:

const callnapply = require('./callnapply');



test('testing Function.prototype.call as mock function', () => {

    const outer = jest.fn(); 

    const name = 'Aakash';

    const age = 22;

    const tee = 'M';

    callnapply.caller(this, outer, name, age, tee);

    expect(outer.call).toHaveBeenCalledWith(name, age, tee);

});

How do I write the test to check if the method that I am passing is, in fact, being called by the Function.prototype.call function only? I want to check whether .call() is being called and not some other implementation that has been written for the method call.