Add tests for User

[sgaynetdinov]

• [x] get_career

• [ ] get_city

• [ ] get_country

• [ ] get_followers

• [ ] get_followers_count

• [ ] get_friends

• [ ] get_friends_count

• [ ] get_military

• [ ] get_occupation

• [ ] is_online

• [ ] get_personal

• [ ] get_photos

• [ ] get_relatives

• [ ] get_schools

• [ ] get_universities

• [ ] get_walls

• [ ] get_wall

• [ ] get_walls_count

• [ ] get_groups

[sgaynetdinov]

http://cra.mr/2014/05/20/mocking-requests-with-responses