我正在学习Rspec的+黄瓜RSpec的书 。 我刚刚开始，同时制定了密码破译游戏。
在这里面，还有一个特点，“密码破译开始游戏”，仅仅表示用户在shell中键入命令并获得两个反应：“欢迎到密码破译” 和“输入一个猜测：”。 这是功能如何的样子：
Feature: code-breaker starts game
As a code-breaker
I want to start a game
So that I can break the code
Scenario: start game
Given I am not yet playing
When I start a new game
Then I should see "Welcome to Codebreaker!"
And I should see "Enter a guess:"
作为输出使用的cucumber脚本，这本书是创建一个模拟对象output ，其能接收的puts与信息Welcome to Codebreaker! 并Enter a guess:论点。 这是它的外观，在步骤定义：
#the mock object
class Output
def messages
@messages ||= []
end
def puts(message)
messages << message
end
end
def output
@output ||= Output.new
end
Given /^I am not yet playing$/ do
end
When /^I start a new game$/ do
game = Codebreaker::Game.new(output)
game.start
end
Then /^I should see "([^"]*)"$/ do |message|
output.messages.should include(message)
end
好了，到现在也没有问题。
做这个练习，我记得曾经读过之前rspeck双打框架能够黄瓜内使用，所以我想我可以清理它一点点。
首先，我已经包括rspeck在双打框架support/env.rb ：
require 'cucumber/rspec/doubles'
然后，我已经改变了一步定义：
Given /^I am not yet playing$/ do
end
When /^I start a new game$/ do
@output = double('output').as_null_object #the mock object
game = Codebreaker::Game.new(@output)
game.start
end
Then /^I should see "([^"]*)"$/ do |message|
@output.should_receive(:puts).with(message)
end
奇怪认为，现在，当我用黄瓜执行功能，在总结我得到的所有4个步骤传球而不是整个场景。 这怎么可能？ 它是什么回事？ 这是输出我在命令行中得到：
Feature: code-breaker starts game
As a code-breaker
I want to start a game
So that I can break the code
Scenario: start game # features/codebreaker_starts_game.feature:6
Given I am not yet playing # features/step_definitions/codebreaker_steps.rb:1
When I start a new game # features/step_definitions/codebreaker_steps.rb:4
Then I should see "Welcome to Codebreaker!" # features/step_definitions/codebreaker_steps.rb:10
And I should see "Enter a guess:" # features/step_definitions/codebreaker_steps.rb:10
(Double "output").puts("Welcome to Codebreaker!")
expected: 1 time
received: 0 times (RSpec::Mocks::MockExpectationError)
/home/a_user/www/codebreaker/features/step_definitions/codebreaker_steps.rb:11:in `block in <top (required)>'
/var/lib/gems/1.9.1/gems/rspec-mocks-2.10.1/lib/rspec/mocks/error_generator.rb:80:in `__raise'
/var/lib/gems/1.9.1/gems/rspec-mocks-2.10.1/lib/rspec/mocks/error_generator.rb:39:in `raise_expectation_error'
/var/lib/gems/1.9.1/gems/rspec-mocks-2.10.1/lib/rspec/mocks/message_expectation.rb:251:in `generate_error'
/var/lib/gems/1.9.1/gems/rspec-mocks-2.10.1/lib/rspec/mocks/message_expectation.rb:207:in `verify_messages_received'
/var/lib/gems/1.9.1/gems/rspec-mocks-2.10.1/lib/rspec/mocks/method_double.rb:117:in `block in verify'
/var/lib/gems/1.9.1/gems/rspec-mocks-2.10.1/lib/rspec/mocks/method_double.rb:117:in `each'
/var/lib/gems/1.9.1/gems/rspec-mocks-2.10.1/lib/rspec/mocks/method_double.rb:117:in `verify'
/var/lib/gems/1.9.1/gems/rspec-mocks-2.10.1/lib/rspec/mocks/proxy.rb:88:in `block in verify'
/var/lib/gems/1.9.1/gems/rspec-mocks-2.10.1/lib/rspec/mocks/proxy.rb:88:in `each'
/var/lib/gems/1.9.1/gems/rspec-mocks-2.10.1/lib/rspec/mocks/proxy.rb:88:in `verify'
/var/lib/gems/1.9.1/gems/rspec-mocks-2.10.1/lib/rspec/mocks/methods.rb:116:in `rspec_verify'
/var/lib/gems/1.9.1/gems/rspec-mocks-2.10.1/lib/rspec/mocks/space.rb:11:in `block in verify_all'
/var/lib/gems/1.9.1/gems/rspec-mocks-2.10.1/lib/rspec/mocks/space.rb:10:in `each'
/var/lib/gems/1.9.1/gems/rspec-mocks-2.10.1/lib/rspec/mocks/space.rb:10:in `verify_all'
/var/lib/gems/1.9.1/gems/rspec-mocks-2.10.1/lib/rspec/mocks.rb:19:in `verify'
/var/lib/gems/1.9.1/gems/cucumber-1.1.9/lib/cucumber/rspec/doubles.rb:12:in `After'
Failing Scenarios:
cucumber features/codebreaker_starts_game.feature:6 # Scenario: start game
1 scenario (1 failed)
4 steps (4 passed)
0m0.009s
