How can I tell Rails to use RSpec instead of test-unit when creating a new Rails app?

Question

I have test-unit installed and rspec installed (along with -core, -expectations, -mocks and -rails

Answer 1

Once you created your rails application with:

rails new  -T  # to exclude Test::Unit

Add the RSpec gem to your Gemfile in the following way:

group :development, :test do
  gem "rspec-rails"
end

In Command line write:

bundle install  # this will install the missing gems

Now you need to install RSpec by running:

rails generate rspec:install

This will generate the following files:

create  .rspec
create  spec
create  spec/spec_helper.rb
create  spec/rails_helper.rb

I strongly recommended to read through all spec_helper and rails_helper comments to get a good understanding of what each option does.

Once everything is set you can run all your tests with:

bundle exec rspec

You can read more about the recommended spec_helper and rails_helper configurations on https://kolosek.com/rails-rspec-setup.