user_spec.rb

require 'spec_helper'

class User
  def initialize(args = {}); end

  def email
    'someone@example.com'
  end

  def mobile
    12021679918
  end
end

describe User do
  describe "#initialize with old should way" do
    it "should set the email and mobile for user" do
      u = User.new email: 'someone@example.com', mobile: 12021679918
      u.email.should == 'someone@example.com'
      u.mobile.should == 12021679918
    end
  end

  describe "#initialize with new expect way" do
    it "expects email and mobile param for user" do
      u = User.new email: 'someone@example.com', mobile: 12021679918
      expect(u.email).to eq('someone@example.com')
      expect(u.mobile).to eq(12021679918)
    end
  end
end