Contents

require 'rspec/core'
require 'rspec/expectations'

module RSpec
  module Matchers
    # @api private
    # Provides the implementation for `negate`.
    # Not intended to be instantiated directly.
    class Negate
      include Composable
      include Pretty

      def initialize(matcher)
        @matcher = matcher
      end

      # @api private
      # @return [Boolean]
      def matches?(*args, &block)
        if @matcher.respond_to?(:does_not_match?)
          @matcher.does_not_match?(*args, &block)
        else
          !@matcher.matches?(*args, &block)
        end
      end

      # @api private
      # @return [Boolean]
      def does_not_match?(*args, &block)
        @matcher.matches?(*args, &block)
      end

      # @private
      # @return [String]
      def failure_message
        if @matcher.respond_to? :failure_message_when_negated
          @matcher.failure_message_when_negated
        elsif @matcher.respond_to? :description
          "expected #{surface_descriptions_in(@matcher.actual).inspect} not to #{surface_descriptions_in(@matcher).inspect}"
        end
      end

      # @api private
      # @return [String]
      def failure_message_when_negated
        @matcher.failure_message
      end

      # @api private
      # @return [String]
      def description
        "~#{surface_descriptions_in(@matcher).inspect}"
      end

      # @api private
      # @return [Boolean]
      def supports_block_expectations?
        @matcher.supports_block_expectations?
      end
    end

    # Passes if provided +matcher+ fails and vice-versa.
    #
    # @example
    #   expect([1]).to negate(eq(2))
    #   expect([1]).not_to negate(eq(1))
    def negate(matcher)
      Negate.new(matcher)
    end
  end
end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
rspec-change_to_now-1.1.0	lib/rspec/change_to_now/negate.rb
rspec-change_to_now-1.0.3	lib/rspec/change_to_now/negate.rb
rspec-change_to_now-1.0.2	lib/rspec/change_to_now/negate.rb