[ActionMailer] Rename test/test_test to test/test_case_test
[ci skip] add line about text layout
AR#reset_column_information sometimes queries via table_exists?

so this assertion causes random test fail
MySQL: set connection collation along with the charset

Sets the connection collation to the database collation configured
in database.yml. Otherwise, `SET NAMES utf8mb4` will use the default
collation for that charset (utf8mb4_general_ci) when you may have chosen
a different collation, like utf8mb4_unicode_ci.

This only applies to literal string comparisons, not column values, so
it is unlikely to affect you.
Merge pull request #16752 from Shruti2791/shruti_workspace

[ci skip] add line about text layout
Merge pull request #16751 from seuros/rename

[ActionMailer] Rename test/test_test to test/test_case_test
Clean up grammar from #16752 [ci skip]
Allow polymorphic routes with nil when a route can still be drawn

Suppose you have two resources routed in the following manner:

```ruby
resources :blogs do
  resources :posts
end

resources :posts
```

When using polymorphic resource routing like `url_for([@blog, @post])`, and `@blog` is `nil` Rails should still try to match the route to the top-level posts resource.

Fixes #16754
Since /console is an optional feature, mention <%= console %> instead.

(/console is not mounted by default with web-console 2.0.)
Merge pull request #16747 from rsutphin/web-console-gemfile-comment

Clarify that /console is an optional feature
Keep it closer to the original wording [ci skip]
Merge pull request #16755 from codeodor/master

Allow polymorphic routes with nil when a route can still be drawn