RSpec - Stubs

如果你已经读过关于RSpec Doubles(aka Mocks)的一节,那么你已经看到了RSpec Stubs。 在RSpec,一种杂乱常常被称为“Stub方法”,它的一种特殊方法,即“在”现有方法或甚至不存在的方法。

这里是关于“RSpec Doubles”一节的守则。

class ClassRoom 
   def initiapze(students) 
      @students = students 
   End
   
   def pst_student_names 
      @students.map(&:name).join( , ) 
   end 
end 

describe ClassRoom do 
   it  the pst_student_names method should work correctly  do 
      student1 = double( student ) 
      student2 = double( student ) 
      
      allow(student1).to receive(:name) {  John Smith }
      allow(student2).to receive(:name) {  Jill Smith } 
      
      cr = ClassRoom.new [student1,student2]
      expect(cr.pst_student_names).to eq( John Smith,Jill Smith ) 
   end 
end

举例来说,“允许()”方法提供了我们需要测试“级Room”级的方法。 在这种情况下,我们需要一个只像学生班级那样做的物体,但这个班子实际上不存在。 我们知道,学生阶级需要提供一种名称方法,我们利用允许()为姓名制造一种方法。

值得注意的是,RSpec的辛比多年来已经改变了比值。 在旧版本的RSpec中,上述方法的模糊之处将像这样界定——

student1.stub(:name).and_return( John Smith ) 
student2.stub(:name).and_return( Jill Smith )

让我们采用上述代码,用旧的RSpec syntax取代allow(>)条线。

class ClassRoom 
   def initiapze(students) 
      @students = students 
   end 
   
   def pst_student_names 
      @students.map(&:name).join( , ) 
   end 
	
end 

describe ClassRoom do 
   it  the pst_student_names method should work correctly  do 
      student1 = double( student ) 
      student2 = double( student )
      
      student1.stub(:name).and_return( John Smith )
      student2.stub(:name).and_return( Jill Smith ) 
      
      cr = ClassRoom.new [student1,student2] 
      expect(cr.pst_student_names).to eq( John Smith,Jill Smith ) 
   end 
end

在执行上述法典时,你将看到这一产出。

.
Deprecation Warnings:

Using `stub` from rspec-mocks  old `:should` syntax without exppcitly 
   enabpng the syntax is deprec 

ated. Use the new `:expect` syntax or exppcitly enable `:should` instead. 
   Called from C:/rspec_tuto 

rial/spec/double_spec.rb:15:in `block (2 levels) in <top (required)> .
If you need more of the backtrace for any of these deprecations 
   to identify where to make the necessary changes, you can configure 

`config.raise_errors_for_deprecations!`, and it will turn the 
   deprecation warnings into errors, giving you the full backtrace.

1 deprecation warning total

Finished in 0.002 seconds (files took 0.11401 seconds to load)
1 example, 0 failures

它建议,当你需要在RSpec实例中制造方法障碍时,请你使用新许可,但我们在此提供了旧的风格,以便你看到这一点。