make @bitsweat happy. :heart:
let the class cache object clean up user input
Merge pull request #12181 from claudiob/remove-unused-helper-fixtures

Remove helper fixtures not used in any test
Removed unnecessary require
[ci skip] Documentation on how to create custom rake tasks.
Removed unused modules and classes
Merge pull request #12187 from anupamc/master

Removed unnecessary require
use assert_empty in activemodel conditional validation test cases
Make AC standalone rendering work
Merge pull request #12173 from arunagw/fixes_reverted_by_revert_commit

Revert fixes
Merge pull request #12189 from rajcybage/test_assert

use assert_empty in activemodel conditional validation test cases
Don't mutate the Base settings by merge!ing the given value
Refactor handling of action normalization

Reference:
Bloody mess internals
http://gusiev.com/slides/rails_contribution/static/#40
Plural of Deer not deer

Change the plural of Deer word in the naming conventions
Reset ActionView::Base.logger instead of AC::Base.logger

see: 9b0ac0bc74569db460f87ea6888b3847be0ff5be
Clean up unused associations in AR test model
change function def self.table_name to self.table_name

change def self.primary_key to self.primary_key

change def self.primary_key to self.primary_key
:scissors: [ci skip]
More unused associations in AR test models
Fixes typo in Object#try!