Module: RSpec::Mocks::ExampleMethods

Includes:
ArgumentMatchers
Defined in:
lib/rspec/mocks/example_methods.rb

Overview

Contains methods intended to be used from within code examples. Mix this in to your test context (such as a test framework base class) to use rspec-mocks with your test framework. If you're using rspec-core, it'll take care of doing this for you.

Defined Under Namespace

Modules: ExpectHost

Instance Method Summary (collapse)

Methods included from ArgumentMatchers

#any_args, #anything, #array_including, #boolean, #duck_type, #hash_excluding, #hash_including, #instance_of, #kind_of, #no_args

Instance Method Details

- (Object) allow

Note:

If you disable the :expect syntax this method will be undefined.

Used to wrap an object in preparation for stubbing a method on it.

Examples:

allow(dbl).to receive(:foo).with(5).and_return(:return_value)

    		
    
      
# File 'lib/rspec/mocks/example_methods.rb', line 296


    		
  





      

  

    - (Object) allow_any_instance_of 


  

  

    Note:
    
This is only available when you have enabled the expect syntax.



  


Used to wrap a class in preparation for stubbing a method
on instances of it.

  





  

    
Examples:

      
allow_any_instance_of(MyClass).to receive(:foo)

  



  

    
      

    		
    
      
# File 'lib/rspec/mocks/example_methods.rb', line 314


    		
  





      

  

    - (Object) allow_message_expectations_on_nil 


  

    
Disables warning messages about expectations being set on nil.


By default warning messages are issued when expectations are set on
nil.  This is to prevent false-positives and to catch potential bugs
early on.

  







  

    
      
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# File 'lib/rspec/mocks/example_methods.rb', line 200
def allow_message_expectations_on_nil
  RSpec::Mocks.space.proxy_for(nil).warn_about_expectations = false
end

    		
  





      

  

      - (Object) class_double(doubled_class) 
      - (Object) class_double(doubled_class, name) 
      - (Object) class_double(doubled_class, stubs) 
      - (Object) class_double(doubled_class, name, stubs) 


  

    
Constructs a test double against a specific class. If the given class
name has been loaded, only class methods defined on the class are
allowed to be stubbed. In all other ways it behaves like a
double.

  





  
Overloads:

  
    
      
  • 
        - (Object) class_double(doubled_class) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        doubled_class
        (String, Module)
    
      • 

    

    
      
    • 
      
  • 
        - (Object) class_double(doubled_class, name) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        doubled_class
        (String, Module)
    
      • 
    
    • 
        name
        (String/Symbol)
        —
        
      name or description to be used in failure messages
      

      
    
      • 

    

    
      
    • 
      
  • 
        - (Object) class_double(doubled_class, stubs) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        doubled_class
        (String, Module)
    
      • 
    
    • 
        stubs
        (Hash)
        —
        
      hash of message/return-value pairs
      

      
    
      • 

    

    
      
    • 
      
  • 
        - (Object) class_double(doubled_class, name, stubs) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        doubled_class
        (String, Module)
    
      • 
    
    • 
        name
        (String/Symbol)
        —
        
      name or description to be used in failure messages
      

      
    
      • 
    
    • 
        stubs
        (Hash)
        —
        
      hash of message/return-value pairs
      

      
    
      • 

    

    
      
    • 
  


Returns:


    
    
  • 
        
        
    ClassVerifyingDouble
    

    
    
    • 




  

    
      
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# File 'lib/rspec/mocks/example_methods.rb', line 79
def class_double(doubled_class, *args)
  ref = ObjectReference.for(doubled_class)
  ExampleMethods.declare_verifying_double(ClassVerifyingDouble, ref, *args)
end

    		
  





      

  

      - (Object) class_spy(doubled_class) 
      - (Object) class_spy(doubled_class, name) 
      - (Object) class_spy(doubled_class, stubs) 
      - (Object) class_spy(doubled_class, name, stubs) 


  

    
Constructs a test double that is optimized for use with have_received
against a specific class. If the given class name has been loaded,
only class methods defined on the class are allowed to be stubbed.
With a normal double one has to stub methods in order to be able to spy
them. An class_spy automatically spies on all class methods to which the
class responds.

  





  
Overloads:

  
    
      
  • 
        - (Object) class_spy(doubled_class) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        doubled_class
        (String, Module)
    
      • 

    

    
      
    • 
      
  • 
        - (Object) class_spy(doubled_class, name) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        doubled_class
        (String, Class)
    
      • 
    
    • 
        name
        (String/Symbol)
        —
        
      name or description to be used in failure messages
      

      
    
      • 

    

    
      
    • 
      
  • 
        - (Object) class_spy(doubled_class, stubs) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        doubled_class
        (String, Module)
    
      • 
    
    • 
        stubs
        (Hash)
        —
        
      hash of message/return-value pairs
      

      
    
      • 

    

    
      
    • 
      
  • 
        - (Object) class_spy(doubled_class, name, stubs) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        doubled_class
        (String, Class)
    
      • 
    
    • 
        name
        (String/Symbol)
        —
        
      name or description to be used in failure messages
      

      
    
      • 
    
    • 
        stubs
        (Hash)
        —
        
      hash of message/return-value pairs
      

      
    
      • 

    

    
      
    • 
  


Returns:


    
    
  • 
        
        
    ClassVerifyingDouble
    

    
    
    • 




  

    
      
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# File 'lib/rspec/mocks/example_methods.rb', line 191
def class_spy(*args)
  class_double(*args).as_null_object
end

    		
  





      

  

      - (Double) double 
      - (Double) double(name) 
      - (Double) double(stubs) 
      - (Double) double(name, stubs) 


  

    
Constructs an instance of RSpec::Mocks::Double configured
with an optional name, used for reporting in failure messages, and an optional
hash of message/return-value pairs.

  





  

    
Examples:

      
book = double("book", :title => "The RSpec Book")
book.title #=> "The RSpec Book"

card = double("card", :suit => "Spades", :rank => "A")
card.suit  #=> "Spades"
card.rank  #=> "A"

  

  
Overloads:

  
    
      
  • 
        - (Double) double(name) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        name
        (String/Symbol)
        —
        
      name or description to be used in failure messages
      

      
    
      • 

    

    
      
    • 
      
  • 
        - (Double) double(stubs) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        stubs
        (Hash)
        —
        
      hash of message/return-value pairs
      

      
    
      • 

    

    
      
    • 
      
  • 
        - (Double) double(name, stubs) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        name
        (String/Symbol)
        —
        
      name or description to be used in failure messages
      

      
    
      • 
    
    • 
        stubs
        (Hash)
        —
        
      hash of message/return-value pairs
      

      
    
      • 

    

    
      
    • 
  


Returns:




  

    
      
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# File 'lib/rspec/mocks/example_methods.rb', line 34
def double(*args)
  ExampleMethods.declare_double(Double, *args)
end

    		
  





      

  

    - (Object) expect 


  

  

    Note:
    
This method is usually provided by rspec-expectations. However,
if you use rspec-mocks without rspec-expectations, there's a definition
of it that is made available here. If you disable the :expect syntax
this method will be undefined.



  


Used to wrap an object in preparation for setting a mock expectation
on it.

  





  

    
Examples:

      
expect(obj).to receive(:foo).with(5).and_return(:return_value)

  



  

    
      

    		
    
      
# File 'lib/rspec/mocks/example_methods.rb', line 284


    		
  





      

  

    - (Object) expect_any_instance_of 


  

  

    Note:
    
If you disable the :expect syntax this method will be undefined.



  


Used to wrap a class in preparation for setting a mock expectation
on instances of it.

  





  

    
Examples:

      
expect_any_instance_of(MyClass).to receive(:foo)

  



  

    
      

    		
    
      
# File 'lib/rspec/mocks/example_methods.rb', line 305


    		
  





      

  

    - (Object) have_received(method_name, &block) 


  

  

    Note:
    
have_received(...).with(...) is unable to work properly when
passed arguments are mutated after the spy records the received message.



  


Verifies that the given object received the expected message during the
course of the test. On a spy objects or as null object doubles this
works for any method, on other objects the method must have
been stubbed beforehand in order for messages to be verified.


Stubbing and verifying messages received in this way implements the
Test Spy pattern.

  





  

    
Examples:

      
invitation = double('invitation', accept: true)
user.accept_invitation(invitation)
expect(invitation).to have_received(:accept)
# You can also use most message expectations:
expect(invitation).to have_received(:accept).with(mailer).once

  


Parameters:


    
    
  • 
        method_name
        (Symbol)
        —
        
    name of the method expected to have been
called.
    

    
    
    • 




  

    
      
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# File 'lib/rspec/mocks/example_methods.rb', line 280
def have_received(method_name, &block)
  Matchers::HaveReceived.new(method_name, &block)
end

    		
  





      

  

    - (Object) hide_const(constant_name) 


  

    
Hides the named constant with the given value. The constant will be
undefined for the duration of the test.


Like method stubs, the constant will be restored to its original value
when the example completes.

  





  

    
Examples:

      
hide_const("MyClass") # => MyClass is now an undefined constant

  


Parameters:


    
    
  • 
        constant_name
        (String)
        —
        
    The fully qualified name of the constant.
The current constant scoping at the point of call is not considered.
    

    
    
    • 




  

    
      
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# File 'lib/rspec/mocks/example_methods.rb', line 255
def hide_const(constant_name)
  ConstantMutator.hide(constant_name)
end

    		
  





      

  

      - (Object) instance_double(doubled_class) 
      - (Object) instance_double(doubled_class, name) 
      - (Object) instance_double(doubled_class, stubs) 
      - (Object) instance_double(doubled_class, name, stubs) 


  

    
Constructs a test double against a specific class. If the given class
name has been loaded, only instance methods defined on the class are
allowed to be stubbed. In all other ways it behaves like a
double.

  





  
Overloads:

  
    
      
  • 
        - (Object) instance_double(doubled_class) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        doubled_class
        (String, Class)
    
      • 

    

    
      
    • 
      
  • 
        - (Object) instance_double(doubled_class, name) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        doubled_class
        (String, Class)
    
      • 
    
    • 
        name
        (String/Symbol)
        —
        
      name or description to be used in failure messages
      

      
    
      • 

    

    
      
    • 
      
  • 
        - (Object) instance_double(doubled_class, stubs) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        doubled_class
        (String, Class)
    
      • 
    
    • 
        stubs
        (Hash)
        —
        
      hash of message/return-value pairs
      

      
    
      • 

    

    
      
    • 
      
  • 
        - (Object) instance_double(doubled_class, name, stubs) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        doubled_class
        (String, Class)
    
      • 
    
    • 
        name
        (String/Symbol)
        —
        
      name or description to be used in failure messages
      

      
    
      • 
    
    • 
        stubs
        (Hash)
        —
        
      hash of message/return-value pairs
      

      
    
      • 

    

    
      
    • 
  


Returns:


    
    
  • 
        
        
    InstanceVerifyingDouble
    

    
    
    • 




  

    
      
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# File 'lib/rspec/mocks/example_methods.rb', line 56
def instance_double(doubled_class, *args)
  ref = ObjectReference.for(doubled_class)
  ExampleMethods.declare_verifying_double(InstanceVerifyingDouble, ref, *args)
end

    		
  





      

  

      - (Object) instance_spy(doubled_class) 
      - (Object) instance_spy(doubled_class, name) 
      - (Object) instance_spy(doubled_class, stubs) 
      - (Object) instance_spy(doubled_class, name, stubs) 


  

    
Constructs a test double that is optimized for use with have_received
against a specific class. If the given class name has been loaded, only
instance methods defined on the class are allowed to be stubbed.  With
a normal double one has to stub methods in order to be able to spy
them. An instance_spy automatically spies on all instance methods to
which the class responds.

  





  
Overloads:

  
    
      
  • 
        - (Object) instance_spy(doubled_class) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        doubled_class
        (String, Class)
    
      • 

    

    
      
    • 
      
  • 
        - (Object) instance_spy(doubled_class, name) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        doubled_class
        (String, Class)
    
      • 
    
    • 
        name
        (String/Symbol)
        —
        
      name or description to be used in failure messages
      

      
    
      • 

    

    
      
    • 
      
  • 
        - (Object) instance_spy(doubled_class, stubs) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        doubled_class
        (String, Class)
    
      • 
    
    • 
        stubs
        (Hash)
        —
        
      hash of message/return-value pairs
      

      
    
      • 

    

    
      
    • 
      
  • 
        - (Object) instance_spy(doubled_class, name, stubs) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        doubled_class
        (String, Class)
    
      • 
    
    • 
        name
        (String/Symbol)
        —
        
      name or description to be used in failure messages
      

      
    
      • 
    
    • 
        stubs
        (Hash)
        —
        
      hash of message/return-value pairs
      

      
    
      • 

    

    
      
    • 
  


Returns:


    
    
  • 
        
        
    InstanceVerifyingDouble
    

    
    
    • 




  

    
      
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# File 'lib/rspec/mocks/example_methods.rb', line 144
def instance_spy(*args)
  instance_double(*args).as_null_object
end

    		
  





      

  

      - (Object) object_double(object_or_name) 
      - (Object) object_double(object_or_name, name) 
      - (Object) object_double(object_or_name, stubs) 
      - (Object) object_double(object_or_name, name, stubs) 


  

    
Constructs a test double against a specific object. Only the methods
the object responds to are allowed to be stubbed. If a String argument
is provided, it is assumed to reference a constant object which is used
for verification. In all other ways it behaves like a double.

  





  
Overloads:

  
    
      
  • 
        - (Object) object_double(object_or_name) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        object_or_name
        (String, Object)
    
      • 

    

    
      
    • 
      
  • 
        - (Object) object_double(object_or_name, name) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        object_or_name
        (String, Object)
    
      • 
    
    • 
        name
        (String/Symbol)
        —
        
      name or description to be used in failure messages
      

      
    
      • 

    

    
      
    • 
      
  • 
        - (Object) object_double(object_or_name, stubs) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        object_or_name
        (String, Object)
    
      • 
    
    • 
        stubs
        (Hash)
        —
        
      hash of message/return-value pairs
      

      
    
      • 

    

    
      
    • 
      
  • 
        - (Object) object_double(object_or_name, name, stubs) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        object_or_name
        (String, Object)
    
      • 
    
    • 
        name
        (String/Symbol)
        —
        
      name or description to be used in failure messages
      

      
    
      • 
    
    • 
        stubs
        (Hash)
        —
        
      hash of message/return-value pairs
      

      
    
      • 

    

    
      
    • 
  


Returns:


    
    
  • 
        
        
    ObjectVerifyingDouble
    

    
    
    • 




  

    
      
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# File 'lib/rspec/mocks/example_methods.rb', line 102
def object_double(object_or_name, *args)
  ref = ObjectReference.for(object_or_name, :allow_direct_object_refs)
  ExampleMethods.declare_verifying_double(ObjectVerifyingDouble, ref, *args)
end

    		
  





      

  

      - (Object) object_spy(object_or_name) 
      - (Object) object_spy(object_or_name, name) 
      - (Object) object_spy(object_or_name, stubs) 
      - (Object) object_spy(object_or_name, name, stubs) 


  

    
Constructs a test double that is optimized for use with have_received
against a specific object. Only instance methods defined on the object
are allowed to be stubbed.  With a normal double one has to stub
methods in order to be able to spy them. An object_spy automatically
spies on all methods to which the object responds.

  





  
Overloads:

  
    
      
  • 
        - (Object) object_spy(object_or_name) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        object_or_name
        (String, Object)
    
      • 

    

    
      
    • 
      
  • 
        - (Object) object_spy(object_or_name, name) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        object_or_name
        (String, Class)
    
      • 
    
    • 
        name
        (String/Symbol)
        —
        
      name or description to be used in failure messages
      

      
    
      • 

    

    
      
    • 
      
  • 
        - (Object) object_spy(object_or_name, stubs) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        object_or_name
        (String, Object)
    
      • 
    
    • 
        stubs
        (Hash)
        —
        
      hash of message/return-value pairs
      

      
    
      • 

    

    
      
    • 
      
  • 
        - (Object) object_spy(object_or_name, name, stubs) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        object_or_name
        (String, Class)
    
      • 
    
    • 
        name
        (String/Symbol)
        —
        
      name or description to be used in failure messages
      

      
    
      • 
    
    • 
        stubs
        (Hash)
        —
        
      hash of message/return-value pairs
      

      
    
      • 

    

    
      
    • 
  


Returns:


    
    
  • 
        
        
    ObjectVerifyingDouble
    

    
    
    • 




  

    
      
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# File 'lib/rspec/mocks/example_methods.rb', line 167
def object_spy(*args)
  object_double(*args).as_null_object
end

    		
  





      

  

    - (Object) receive 


  

  

    Note:
    
If you disable the :expect syntax this method will be undefined.



  


Used to specify a message that you expect or allow an object
to receive. The object returned by receive supports the same
fluent interface that should_receive and stub have always
supported, allowing you to constrain the arguments or number of
times, and configure how the object should respond to the message.

  





  

    
Examples:

      
expect(obj).to receive(:hello).with("world").exactly(3).times

  



  

    
      

    		
    
      
# File 'lib/rspec/mocks/example_methods.rb', line 323


    		
  





      

  

      - (Object) receive_message_chain(method1, method2) 
      - (Object) receive_message_chain("method1.method2") 
      - (Object) receive_message_chain(method1, method_to_value_hash) 


  

  

    Note:
    
If you disable the :expect syntax this method will be undefined.



  


stubs/mocks a chain of messages on an object or test double.


Warning:


Chains can be arbitrarily long, which makes it quite painless to
violate the Law of Demeter in violent ways, so you should consider any
use of receive_message_chain a code smell. Even though not all code smells
indicate real problems (think fluent interfaces), receive_message_chain still
results in brittle examples.  For example, if you write
allow(foo).to receive_message_chain(:bar, :baz => 37) in a spec and then the
implementation calls foo.baz.bar, the stub will not work.

  





  

    
Examples:

      
allow(double).to receive_message_chain("foo.bar") { :baz }
allow(double).to receive_message_chain(:foo, :bar => :baz)
allow(double).to receive_message_chain(:foo, :bar) { :baz }
# Given any of ^^ these three forms ^^:
double.foo.bar # => :baz

# Common use in Rails/ActiveRecord:
allow(Article).to receive_message_chain("recent.published") { [Article.new] }

  



  

    
      

    		
    
      
# File 'lib/rspec/mocks/example_methods.rb', line 348


    		
  





      

  

    - (Object) receive_messages 


  

  

    Note:
    
If you disable the :expect syntax this method will be undefined.



  


Shorthand syntax used to setup message(s), and their return value(s),
that you expect or allow an object to receive. The method takes a hash
of messages and their respective return values. Unlike with receive,
you cannot apply further customizations using a block or the fluent
interface.

  





  

    
Examples:

      
allow(obj).to receive_messages(:speak => "Hello World")
allow(obj).to receive_messages(:speak => "Hello", :meow => "Meow")

  



  

    
      

    		
    
      
# File 'lib/rspec/mocks/example_methods.rb', line 335


    		
  





      

  

      - (Double) spy 
      - (Double) spy(name) 
      - (Double) spy(stubs) 
      - (Double) spy(name, stubs) 


  

    
Constructs a test double that is optimized for use with
have_received. With a normal double one has to stub methods in order
to be able to spy them. A spy automatically spies on all methods.

  





  
Overloads:

  
    
      
  • 
        - (Double) spy(name) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        name
        (String/Symbol)
        —
        
      name or description to be used in failure messages
      

      
    
      • 

    

    
      
    • 
      
  • 
        - (Double) spy(stubs) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        stubs
        (Hash)
        —
        
      hash of message/return-value pairs
      

      
    
      • 

    

    
      
    • 
      
  • 
        - (Double) spy(name, stubs) 
        
    
  
    
  
    

    

    
  
    Parameters:
    

      
    
    • 
        name
        (String/Symbol)
        —
        
      name or description to be used in failure messages
      

      
    
      • 
    
    • 
        stubs
        (Hash)
        —
        
      hash of message/return-value pairs
      

      
    
      • 

    

    
      
    • 
  


Returns:




  

    
      
120
121
122

    		
    
      
# File 'lib/rspec/mocks/example_methods.rb', line 120
def spy(*args)
  double(*args).as_null_object
end

    		
  





      

  

    - (Object) stub_const(constant_name, value, options = {}) 


  

    
Stubs the named constant with the given value.
Like method stubs, the constant will be restored
to its original value (or lack of one, if it was
undefined) when the example completes.

  





  

    
Examples:

      
stub_const("MyClass", Class.new) # => Replaces (or defines) MyClass with a new class object.
stub_const("SomeModel::PER_PAGE", 5) # => Sets SomeModel::PER_PAGE to 5.

class CardDeck
  SUITS = [:Spades, :Diamonds, :Clubs, :Hearts]
  NUM_CARDS = 52
end
stub_const("CardDeck", Class.new)
CardDeck::SUITS # => uninitialized constant error
CardDeck::NUM_CARDS # => uninitialized constant error

stub_const("CardDeck", Class.new, :transfer_nested_constants => true)
CardDeck::SUITS # => our suits array
CardDeck::NUM_CARDS # => 52

stub_const("CardDeck", Class.new, :transfer_nested_constants => [:SUITS])
CardDeck::SUITS # => our suits array
CardDeck::NUM_CARDS # => uninitialized constant error

  


Parameters:


    
    
  • 
        constant_name
        (String)
        —
        
    The fully qualified name of the constant. The current
constant scoping at the point of call is not considered.
    

    
    
    • 
    
  • 
        value
        (Object)
        —
        
    The value to make the constant refer to. When the
example completes, the constant will be restored to its prior state.
    

    
    
    • 
    
  • 
        options
        (Hash)
        (defaults to: {})
        —
        
    Stubbing options.
    

    
    
    • 


    
Options Hash (options):

    
    
        
  • 
          :transfer_nested_constants
          (Boolean, Array<Symbol>)
          
          
            — 
    Determines
what nested constants, if any, will be transferred from the original value
of the constant to the new value of the constant. This only works if both
the original and new values are modules (or classes).
    

    
        
    • 
    


Returns:


    
    
  • 
        (Object)
        —
        
    the stubbed value of the constant
    

    
    
    • 




  

    
      
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# File 'lib/rspec/mocks/example_methods.rb', line 240
def stub_const(constant_name, value, options={})
  ConstantMutator.stub(constant_name, value, options)
end