Exemplo de mock

mocking_example.rb

require 'spec_helper'
  
describe Employee do
  describe '#salary' do
    it 'return amount based on employee region' do
      region = double
      expect(region).to receive(:salary_by)
                        .with('Nelson').and_return(5000)
      employee = Employee.new('Nelson', region)
      
      expect(employee.salary).to eq(5000)
    end
  end
end