UNIT_TESTING_18834_EDIT_POST

 - [x] Controller 
    - [x] create test_edit_post_validate_notok function
    - [x] create test_edit_post_notok function
    - [x] create test_edit_post_ok function
 - [x] Model
    - [x] create test_edit_post_validate_notok function
    - [x] create test_edit_post_notok function
    - [x] create test_edit_post_ok fucntion