user_spec.rb

  describe ".ask_all_a_random_anonymous_question" do
    before(:each) do
      @user1 = Factory(:user)
      @user2 = Factory(:user)
      @user3 = Factory(:user)
      User.stub(:all).and_return([@user1, @user2, @user3])
    end

    it "should ask each user a random anonymous question" do
      @user1.should_receive(:ask_a_random_anonymous_question)
      @user2.should_receive(:ask_a_random_anonymous_question)
      @user3.should_receive(:ask_a_random_anonymous_question)
      User.ask_all_a_random_anonymous_question
    end
  end