有时,您的RSpec示例需要一种简单的方法来共享可重用的代码.实现这一目标的最佳方法是使用助手.帮助程序基本上是常规的Ruby方法,您可以跨示例共享.为了说明使用助手的好处,让我们考虑这个代码 :
class Dog attr_reader :good_dog, :has_been_walked def initialize(good_or_not) @good_dog = good_or_not @has_been_walked = false end def walk_dog @has_been_walked = true end end describe Dog do it 'should be able to create and walk a good dog' do dog = Dog.new(true) dog.walk_dog expect(dog.good_dog).to be true expect(dog.has_been_walked).to be true end it 'should be able to create and walk a bad dog' do dog = Dog.new(false) dog.walk_dog expect(dog.good_dog).to be false expect(dog.has_been_walked).to be true end end
这代码很清楚,但它很明显尽可能减少重复代码是一个好主意.我们可以使用上面的代码并使用名为create_and_walk_dog()的辅助方法减少一些重复.
class Dog attr_reader :good_dog, :has_been_walked def initialize(good_or_not) @good_dog = good_or_not @has_been_walked = false end def walk_dog @has_been_walked = true end end describe Dog do def create_and_walk_dog(good_or_bad) dog = Dog.new(good_or_bad) dog.walk_dog return dog end it 'should be able to create and walk a good dog' do dog = create_and_walk_dog(true) expect(dog.good_dog).to be true expect(dog.has_been_walked).to be true end it 'should be able to create and walk a bad dog' do dog = create_and_walk_dog(false) expect(dog.good_dog).to be false expect(dog.has_been_walked).to be true end end
当你运行上面的代码时,你会看到这个输出 :
.. Finished in 0.002 seconds (files took 0.11401 seconds to load) 2 examples, 0 failures
正如你所看到的,我们能够推动创建和行走狗对象的逻辑助手,使我们的例子更短更清洁.