jestjs - How to get `this` in jest mock function -


i have below code, mocks function fetchage of person. need conditionally return value based on value of this, this empty object in function. there way in jest?

jest.unmock('person'); const person = require('person');  query.prototype.fetchage = jest.fn(() => {     console.log(this); // returns empty object     if(this.name === 'bob') return 21;     if(this.name === 'joe') return 19; });  test('verify correct ages', function() {   const bob = new person('bob');   expect(bob.fetchage).toequal(21); });


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