9.1.1 Edit form
9.1.2 Unsuccessful edits
9.1.3 Successful edits
9.2.1 Requiring signed-in users;
The document implies that test suite should green, but I'm not.
9.2.2 Requiring the right user (still tests fail)
listing 9.5 mistype update.
fix all tests report green.
9.2.3 Friendly forwarding
9.3.1 User index
9.3.2 Sample users
9.3.3 Pagination
9.3.4 Partial refactoring
9.4.1 Administrative users
9.4.2 The destroy action