A warning line should look like a warning section

[ci skip]
Cleanup loaded features and constants after dependency tests.
Explicit route test class

shows the class that the test must extend in order to have the assert_routing method available
[ci skip] Add Doc of with_options for the case when inherited default options and original options have same keys
Fix that a collection proxy could be cached before the save of the owner, resulting in an invalid proxy lacking the owner’s id.

Absent this fix calls like: owner.association.update_all to behave unexpectedly because they try to act on association objects where
owner_id is null.

more evidence here: https://gist.github.com/Empact/5865555
```
Active Record 3.2.13
-- create_table(:firms, {:force=>true})
   -> 0.1371s
-- create_table(:clients, {:force=>true})
   -> 0.0005s
1 clients. 1 expected.
1 clients updated. 1 expected.
```

```
Active Record 4.0.0
-- create_table(:firms, {:force=>true})
   -> 0.1606s
-- create_table(:clients, {:force=>true})
   -> 0.0004s
1 clients. 1 expected.
0 clients updated. 1 expected.
```
fix autoload tests
Change `gsub` to `tr` where possible
speed up fixtures by not loading all their classes
Rephrasing sentences
Merge pull request #17146 from divineforest/active-record-gsub-to-tr

Change `gsub` to `tr` where possible
Merge pull request #17184 from fillman/master

fix autoload tests
Merge pull request #17198 from neerajdotname/wordsmitthing

Rephrasing sentences
Fix grammar
Merge pull request #17201 from djpowers/patch-1

Fix grammar [ci skip]
remove un-needed sort

HTML doesn't care what order the elements are rendered in, so why should we?

Updates tests to use proper `assert_dom_equal` instead of `assert_equal` /cc @jeremy
Merge pull request #17203 from schneems/schneems/av-tag_helper

remove un-needed sort
fix tests on action_mailer

Include appropriate helpers and use `assert_dom_equal` where applicable
Merge pull request #17204 from schneems/schneems/fix-am-tests-master

fix tests on action_mailer
Only include the needed assertions
update error message when InlineAdapter is used