Automatically create a database similar to Rails

[ilyazub]

It'd be good to automatically set up a database similar to Rails. Rails docs.

In Rails, ActiveRecord::Tasks::DatabaseTasks.reconstruct_from_schema is called inside the ActiveSupport::Testing::Parallelization#after_fork_hook. Ref.

TODO

• Clarify documentation about DB creation (related to TEST_ENV_NUMBER value incorrect for first process #12)
• Execute code or command before executing rspec in a subprocess. First guess is to prepend commands to the command variable.

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Originally posted by @pirj in rspec/rspec-rails#2104 (comment):

What was missing (and what Rails provides with its default testing framework):

Active Record automatically handles creating a database

Without createdb myproject2 etc it didn't work. I've seen rails db:test:prepare, but db:create wasn't apparently called.