[Rails] No rake db:test:* commands in my Rails rake. Where may I find all missing rake commands?

In Rails Guides
(http://guides.rubyonrails.org/testing.html#preparing-your-application-for-testing)
they mention some "rake db:test:load" command and other "rake db:test:*"
commands. But when I do "rake -D db" or "rake -T" there is no any "rake
db:test" in the output.

It makes me think that there are dozens of rake commands that are not
distributed when I do "rake -T" (Display the tasks (matching optional
PATTERN) with descriptions) or "rake -D task" (Describe the tasks
(matching optional PATTERN) with descriptions).

Is there one special place where ALL Rails rake commands are presented
with full explanation for them? Some Rake API?

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