The tests are failing

[dortamiguel]

Hi, when I run npm test I get the following errors:

1) posts author hook hook can be used:
     TypeError: Cannot read property 'firstName' of undefined
      at src/services/posts/hooks/author.js:16:24
      at Context.<anonymous> (test/services/posts/hooks/author.test.js:16:13)

  2) posts createdAt hook hook can be used:
     AssertionError: undefined == true
      at Context.<anonymous> (test/services/posts/hooks/createdAt.test.js:18:12)

  3) posts updatedAt hook hook can be used:
     AssertionError: undefined == true
      at Context.<anonymous> (test/services/posts/hooks/updatedAt.test.js:18:12)