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Class: RSpec::Matchers::BuiltIn::Change Private

Do not use. This class is for internal use only.
Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, BaseMatcher
Instance Chain:
self, BaseMatcher, BaseMatcher::DefaultFailureMessages, BaseMatcher::StringEncodingFormatting, BaseMatcher::HashFormatting, ::RSpec::Matchers::Composable
Inherits: RSpec::Matchers::BuiltIn::BaseMatcher
Defined in: rspec-expectations/lib/rspec/matchers/built_in/change.rb

Overview

Provides the implementation for RSpec::Matchers#change. Not intended to be instantiated directly.

Constant Summary

BaseMatcher - Inherited

UNDEFINED

Class Method Summary

BaseMatcher - Inherited

.matcher_name, .new,
.underscore

Borrowed from ActiveSupport.

Instance Attribute Summary

BaseMatcher - Inherited

#actual,
#diffable?

::RSpec::Matchers are not diffable by default.
#expected, #expects_call_stack_jump?, #matcher_name, #matcher_name=, #rescued_exception,
#supports_block_expectations?

Most matchers are value matchers (i.e. meant to work with ‘expect(value)`) rather than block matchers (i.e. meant to work with `expect { }`), so this defaults to false.
#supports_value_expectations?

BaseMatcher::StringEncodingFormatting - Included

#string_encoding_differs?

:nocov:

Instance Method Summary

BaseMatcher - Inherited

#actual_formatted,
#description

Generates a description using ::RSpec::Matchers::EnglishPhrasing.
#expected_formatted,
#match_unless_raises

Used to wrap a block of code that will indicate failure by raising one of the named exceptions.
#matches?

Indicates if the match is successful.

BaseMatcher::DefaultFailureMessages - Included

#failure_message

Provides a good generic failure message.
#failure_message_when_negated

Provides a good generic negative failure message.

BaseMatcher::StringEncodingFormatting - Included

#format_encoding

Formats a String’s encoding as a human readable string :nocov:

BaseMatcher::HashFormatting - Included

#improve_hash_formatting

‘{ :a => 5, :b => 2 }.inspect` produces:

::RSpec::Matchers::Composable - Included

#&

Alias for Composable#and.
#===

Delegates to #matches?.
#and

Creates a compound and expectation.
#description_of

Returns the description of the given object in a way that is aware of composed matchers.
#or

Creates a compound or expectation.
#values_match?

This provides a generic way to fuzzy-match an expected value against an actual value.
#|

Alias for Composable#or.
#should_enumerate?

We should enumerate arrays as long as they are not recursive.
#surface_descriptions_in

Transforms the given data structure (typically a hash or array) into a new data structure that, when #inspect is called on it, will provide descriptions of any contained matchers rather than the normal #inspect output.
#unreadable_io?,
#with_matchers_cloned

Historically, a single matcher instance was only checked against a single value.

Instance Attribute Details

#supports_block_expectations? ⇒ Boolean (readonly)

[ GitHub ] 

  


# File 'rspec-expectations/lib/rspec/matchers/built_in/change.rb', line 76



def supports_block_expectations?
  true
end


  








  

    #supports_value_expectations?  ⇒ Boolean  (readonly)
  



  

    
  





  


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# File 'rspec-expectations/lib/rspec/matchers/built_in/change.rb', line 81



def supports_value_expectations?
  false
end


  







Instance Method Details



  

    #by(expected_delta)  
  



  

    

Specifies the delta of the expected change.


  





  


  [ GitHub ]


  

  


# File 'rspec-expectations/lib/rspec/matchers/built_in/change.rb', line 10



def by(expected_delta)
  ChangeRelatively.new(change_details, expected_delta, :by) do |actual_delta|
    values_match?(expected_delta, actual_delta)
  end
end


  








  

    #by_at_least(minimum)  
  



  

    

Specifies a minimum delta of the expected change.


  





  


  [ GitHub ]


  

  


# File 'rspec-expectations/lib/rspec/matchers/built_in/change.rb', line 18



def by_at_least(minimum)
  ChangeRelatively.new(change_details, minimum, :by_at_least) do |actual_delta|
    actual_delta >= minimum
  end
end


  








  

    #by_at_most(maximum)  
  



  

    

Specifies a maximum delta of the expected change.


  





  


  [ GitHub ]


  

  


# File 'rspec-expectations/lib/rspec/matchers/built_in/change.rb', line 26



def by_at_most(maximum)
  ChangeRelatively.new(change_details, maximum, :by_at_most) do |actual_delta|
    actual_delta <= maximum
  end
end


  








  

    #change_details   (private)
  

  [ GitHub ]


  

  


# File 'rspec-expectations/lib/rspec/matchers/built_in/change.rb', line 93



def change_details
  @change_details ||= ChangeDetails.new(matcher_name, @receiver, @message, &@block)
end


  








  

    #description  ⇒ String 
  



  

    
  





  


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# File 'rspec-expectations/lib/rspec/matchers/built_in/change.rb', line 71



def description
  "change #{change_details.value_representation}"
end


  








  

    #does_not_match?(event_proc)  ⇒ Boolean 
  



  

    
  





  


  [ GitHub ]


  

  


# File 'rspec-expectations/lib/rspec/matchers/built_in/change.rb', line 50



def does_not_match?(event_proc)
  raise_block_syntax_error if block_given?
  perform_change(event_proc) && !change_details.changed?
end


  








  

    #failure_message  ⇒ String 
  



  

    
  





  


  [ GitHub ]


  

  


# File 'rspec-expectations/lib/rspec/matchers/built_in/change.rb', line 57



def failure_message
  "expected #{change_details.value_representation} to have changed, " \
  "but #{positive_failure_reason}"
end


  








  

    #failure_message_when_negated  ⇒ String 
  



  

    
  





  


  [ GitHub ]


  

  


# File 'rspec-expectations/lib/rspec/matchers/built_in/change.rb', line 64



def failure_message_when_negated
  "expected #{change_details.value_representation} not to have changed, " \
  "but #{negative_failure_reason}"
end


  








  

    #from(value)  
  



  

    

Specifies the original value.


  





  


  [ GitHub ]


  

  


# File 'rspec-expectations/lib/rspec/matchers/built_in/change.rb', line 40



def from(value)
  ChangeFromValue.new(change_details, value)
end


  








  

    #matches?(event_proc)  ⇒ Boolean 
  



  

    
  





  


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# File 'rspec-expectations/lib/rspec/matchers/built_in/change.rb', line 45



def matches?(event_proc)
  raise_block_syntax_error if block_given?
  perform_change(event_proc) && change_details.changed?
end


  








  

    #negative_failure_reason   (private)
  

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# File 'rspec-expectations/lib/rspec/matchers/built_in/change.rb', line 119



def negative_failure_reason
  return "was not given a block" unless Proc === @event_proc
  "did change from #{@actual_before_description} " \
  "to #{description_of change_details.actual_after}"
end


  








  

    #perform_change(event_proc)   (private)
  

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# File 'rspec-expectations/lib/rspec/matchers/built_in/change.rb', line 97



def perform_change(event_proc)
  @event_proc = event_proc
  change_details.perform_change(event_proc) do |actual_before|
    # pre-compute values derived from the `before` value before the
    # mutation is applied, in case the specified mutation is mutation
    # of a single object (rather than a changing what object a method
    # returns). We need to cache these values before the `before` value
    # they are based on potentially gets mutated.
    @actual_before_description = description_of(actual_before)
  end
end


  








  

    #positive_failure_reason   (private)
  

  [ GitHub ]


  

  


# File 'rspec-expectations/lib/rspec/matchers/built_in/change.rb', line 114



def positive_failure_reason
  return "was not given a block" unless Proc === @event_proc
  "is still #{@actual_before_description}"
end


  








  

    #raise_block_syntax_error   (private)
  



  

    
  





  
Raises:


    
  
  • 
    (SyntaxError)
  
    • 





  [ GitHub ]


  

  


# File 'rspec-expectations/lib/rspec/matchers/built_in/change.rb', line 109



def raise_block_syntax_error
  raise SyntaxError, "Block not received by the `change` matcher. " \
  "Perhaps you want to use `{ ... }` instead of do/end?"
end


  








  

    #to(value)  
  



  

    

Specifies the new value you expect.


  





  


  [ GitHub ]


  

  


# File 'rspec-expectations/lib/rspec/matchers/built_in/change.rb', line 34



def to(value)
  ChangeToValue.new(change_details, value)
end