Just a wild guess; but since User Story #9 requires that
My quote machine should fetch the new quote’s author when the #new-quote button is clicked and display it in the #author element.
could it be because the test is expecting to see a different author than the current one every time #new-quote button is pressed and your quote machine only changes to a new author when user clicks the ‘New Author’ button (which is not part of the tests)?