RSpec-帮助器 - 芒果文档

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📜 RSpec-帮助器

📅 最后修改于: 2020-12-06 10:57:32 🧑 作者: Mango

有时，您的RSpec示例需要一种共享可重用代码的简便方法。最好的方法是使用助手。助手基本上是常规的Ruby方法，您可以在示例中共享它们。为了说明使用助手的好处，让我们考虑以下代码-

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

这段代码很清楚，但是尽可能减少重复的代码总是一个好主意。我们可以采用上面的代码，并使用名为create_and_walk_dog()的帮助程序方法来减少这种重复。

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

运行上面的代码时，您将看到此输出-

.. 
Finished in 0.002 seconds (files took 0.11401 seconds to load) 
2 examples, 0 failures

如您所见，我们能够将创建和移动狗对象的逻辑推入帮助器中，从而使我们的示例更短，更清晰。