rake test app/model/foo.rb and rake test models/foo works
add integration test for shorthand rake tests
updating the guide
Grammar
Typo fix
`fast_xs` support has been removed.  Use 'String#encode(xml: :attr)`.
Corrected model test directory to be test/models instead of test/unit.
Improve some variable naming for the integration test in the testing guide. [ci skip]
remove unused variables
Merge pull request #10118 from vipulnsward/remove_unused_var_task

remove unused variables
Bring back ActiveRecord::Base#connection_handler removed by mistake on b37399ab
Add option to Class#class_attribute for skipping the query method
Deprecate ActiveRecord#Base.default_scopes?

See #10107.
Merge pull request #10113 from Agis-/default_scopes_predicate

Deprecate ActiveRecord#Base.default_scopes?

Closes #10107
change some more merge to merge! on new hashes
sprockets 2.9.x doesn't work with uglifier 2.0 yet.

See https://travis-ci.org/rails/rails/jobs/6110543#L1285 for the failure

cc @josh
Fix markdown formatting
Merge pull request #10120 from vipulnsward/change_merge_on_new_hash

change some more merge to merge! on new hashes
Merge pull request #10121 from Agis-/patch-2

Fix markdown formatting
Forgot to lock the uglifier version in our Gemfile

Related with 575838795019f7402992e3bfa83a0c5048cf143d