capitalizeName - Version 2 (more robust)

capitalizeName.spec.ts

import { capitalizeName } from "./capitalizeName";

describe('capitalizeName', () => {

  it('should capitalize the name in the object', () => {
    
    const testObj = { name: 'Qarun', age: 25 };
    expect(capitalizeName(testObj)).toEqual({name: 'QARUN', age: 25});
  
  });

  it('should not fail if the name key is missing', () => {
    const missingName = { age: 25 };
    expect(capitalizeName(missingName)).toEqual({name: '', age: 25});
  });

  it('should throw an error if the name key is not a string', () => {
    const improperName = { name: 10, age: 25 };

    expect(() => { capitalizeName(improperName) }).toThrowError("'name' key in object must be a string.");
  });

  it('should throw an error if the object is null or undefined', () => {
    expect(() => { capitalizeName(undefined) }).toThrowError('object is null or undefined');

    expect(() => { capitalizeName(null) }).toThrowError('object is null or undefined');
  });


});