class RSpec::Matchers::BuiltIn::ChangeRelatively

@api private
Used to specify a relative change.

def description

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    Private: - 
def description
  "change #{@change_details.value_representation} " \
  "#{@relativity.to_s.tr('_', ' ')} #{description_of @expected_delta}"
end

def does_not_match?(_event_proc)

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    Private: - 
def does_not_match?(_event_proc)
  raise NotImplementedError, "`expect { }.not_to change " \
    "{ }.#{@relativity}()` is not supported"
end

def failure_message

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    Private: - 
def failure_message
  "expected #{@change_details.value_representation} to have changed " \
  "#{@relativity.to_s.tr('_', ' ')} " \
  "#{description_of @expected_delta}, but #{failure_reason}"
end

def failure_reason 

def failure_reason
  return "was not given a block" unless Proc === @event_proc
  "was changed by #{description_of @change_details.actual_delta}"
end

def initialize(change_details, expected_delta, relativity, &comparer) 

def initialize(change_details, expected_delta, relativity, &comparer)
  @change_details = change_details
  @expected_delta = expected_delta
  @relativity     = relativity
  @comparer       = comparer
end

def matches?(event_proc)

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    Private: - 
def matches?(event_proc)
  @event_proc = event_proc
  @change_details.perform_change(event_proc) && @comparer.call(@change_details.actual_delta)
end

def supports_block_expectations?

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    Private: - 
def supports_block_expectations?
  true
end

def supports_value_expectations?

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    Private: - 
def supports_value_expectations?
  false
end