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Contents
module RSpec
module Matchers
# Decorator that wraps a matcher and overrides `description`
# using the provided block in order to support an alias
# of a matcher. This is intended for use when composing
# matchers, so that you can use an expression like
# `include( a_value_within(0.1).of(3) )` rather than
# `include( be_within(0.1).of(3) )`, and have the corresponding
# description read naturally.
#
# @api private
class AliasedMatcher < MatcherDelegator
def initialize(base_matcher, description_block)
@description_block = description_block
super(base_matcher)
end
# Forward messages on to the wrapped matcher.
# Since many matchers provide a fluent interface
# (e.g. `a_value_within(0.1).of(3)`), we need to wrap
# the returned value if it responds to `description`,
# so that our override can be applied when it is eventually
# used.
def method_missing(*)
return_val = super
return return_val unless return_val.respond_to?(:description)
AliasedMatcher.new(return_val, @description_block)
end
# Provides the description of the aliased matcher. Aliased matchers
# are designed to behave identically to the original matcher except
# for this method. The description is different to reflect the aliased
# name.
#
# @api private
def description
@description_block.call(super)
end
end
end
end
Version data entries
8 entries across 8 versions & 2 rubygems