Add minitest and minitest-rails
Edit database settings
Migrate database: create documents table
Add fixtures + test for document model
Remove minitest from Gemfile (it's included by default with rails)
Add minitest-rg to colorize output
Replace pride with rg
Add minitest-reporters to get RSpec-style output
Use minitest-reporters
Use FactoryGirl instead of fixtures
Replace fixtures with factories
Remove minitest-rg and use both minitest/spec and factory_girl
Remove minitest-rails (not necessary to use MiniTest::Spec)
Remove minitest-rg (in favor of minitest-reporters)