I love RSpec but recently I’ve decided to build sideproject with 100% Rails 6 vanilla environment (that means no extra gems, just what is inside Rails 6, including the Minitest test environment)

Problem is Minitest stubs and mocks suuuucks !

If you are interested in Minitest mocks check this article

So I want to use Rails Minitest but RSpec mocks and this is how:

# Gemfile

# ...

group :test do
  # ...
  gem 'rspec-mocks'
end

# ...

note, no rails-rspec is not required

# test/test_helper

# ...
require 'rspec/mocks/minitest_integration'
# ...


require 'test_helper'

class AddPhoneControllerTest < ActionDispatch::IntegrationTest
  test 'POST create add phone to inzerat when valid arguments should redirect to enter code path' do
    post some_path, params: { phone: { country: 'sk', number: '908111222' } }

    expect(SmsGatewayContract.contract)
      .to receive(:send_sms)
      .and_call_original

    post_add_phone_to_inzerat
  end

end

more resources:

Alternatives: