qa_restore-names/src/restoreNames.test.js at 1cf05e493ce4c7a82d260a8af9fc40dace36b276 · mate-academy/qa_restore-names · GitHub

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'use strict';

describe('restoreNames', () => {
  const { restoreNames } = require('./restoreNames');

  it('should exist', () => {
    expect(restoreNames).toBeInstanceOf(Function);
  });

  // write tests here

  it('should not change existing names', () => {
    const users = [
      {
        firstName: 'Jack',
        lastName: 'Holy',
        fullName: 'Jack Holy',
      },
      {
        firstName: 'Mike',
        lastName: 'Adams',
        fullName: 'Mike Adams',
      },
    ];

    restoreNames(users);

    expect(users).toEqual([
      {
        firstName: 'Jack',
        lastName: 'Holy',
        fullName: 'Jack Holy',
      },
      {
        firstName: 'Mike',
        lastName: 'Adams',
        fullName: 'Mike Adams',
      },
    ]);
  });

  it('should restore names', () => {
    const users = [
      {
        firstName: undefined,
        lastName: 'Holy',
        fullName: 'Jack Holy',
      },
      {
        lastName: 'Adams',
        fullName: 'Mike Adams',
      },
    ];

    restoreNames(users);
    expect(users[0].firstName).toBe('Jack');
    expect(users[1].firstName).toBe('Mike');
  });
});