[英]Ruby/Cucumber Composition design
我是Ruby的新手,有一個小問題,我有一個包含其他類的實例的類(組成)
我正在嘗試訪問Cucumber中的類實例,但始終為nil返回錯誤的未定義方法'bk':NilClass(NoMethodError) 'bk'方法位於內部類內部,我猜測此錯誤是因為Cucumber無法訪問內飾類。 設計此解決方案或合適解決方案的最佳方法是什么?
class CarConfig
def initialize(browser, wait)
@browser = browser
@wait = wait
@equipments = Equipment.new(@browser)
@interior = Interior.new(@browser)
@engines = Engines.new(@browser)
@exterior = Exterior.new(@browser)
@grades = Grades.new(@browser)
end
def click_comfort
@browser.find_element(:css, 'a.xdata-id-Comfort').click
end
def check_equipment
equipment_availability = []
equipment_not_available = " equipment not available"
equipment_currently_available = "equipment available"
equipment = [@equipments.lifestyle,@equipments.elegance, @equipments.comfort, @equipments.executive, @equipments.luxury,
@equipments.innova].each do
end
equipment_availability.push equipment
if "#{equipment_availability}".include? "disabled"
equipment_not_available
else
equipment_currently_available
end
結束
Cucumber
Given /^I have selected Comfort$/ do
@car_configurator = CarConfig.new(@browser, @wait)
@browser.get $car_config_page
sleep(2)
@car_configurator.click_comfort
sleep(3)
end
Then /^I should see interior BK as available$/ do
@interior.bk.should_not include ("disabled"), ("selected")
end
問題簡化
該問題可以簡化為不使用黃瓜即可看到(即,問題是通用的ruby編碼問題):
class Interior
def bk()
return 'bk method'
end
end
class CarConfig
def initialize(browser, wait)
@browser = browser
@wait = wait
@interior = Interior.new
end
end
@car_configurator = CarConfig.new('browser', 'wait')
@interior.bk
#=> stuff.rb:16:in `<main>': undefined method `bk' for nil:NilClass (NoMethodError)
問題是@interior
在main的范圍內不存在(或者您的情況是黃瓜步驟)。 它僅在CarConfig實例(即@car_configurator
內定義。
解
如果要訪問@interior
,則需要在@interior
為此創建一個方法。 使用屬性訪問器通常很容易做到這一點。 CarConfig類將添加以下行:
attr_accessor :interior
這樣該類變為:
class CarConfig
attr_accessor :interior
def initialize(browser, wait)
@browser = browser
@wait = wait
@interior = Interior.new
end
end
然后要調用@interior
對象的bk
方法,則需要從@car_configurator
開始訪問它:
@car_configurator.interior.bk
#=> "bk method"
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