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Contents
# frozen_string_literal: true
module ConvenientService
module RSpec
module Matchers
module Custom
##
# NOTE: Navigate to the link below and `Ctrl + F` for "Custom Matcher from scratch"
# for a guide of how to define a complex custom matcher.
# https://rubydoc.info/github/rspec/rspec-expectations/RSpec/Matchers
#
# More info:
# - https://relishapp.com/rspec/rspec-expectations/v/3-11/docs/custom-matchers/define-a-custom-matcher
# - http://rspec.info/documentation/3.9/rspec-expectations/RSpec/Matchers/MatcherProtocol.html
# - https://makandracards.com/makandra/662-write-custom-rspec-matchers
#
class BeDescendantOf
def initialize(base_klass)
@base_klass = base_klass
end
def matches?(klass)
@klass = klass
Utils::Bool.to_bool(klass < base_klass)
end
def description
"be a descendant of `#{base_klass}`"
end
##
# NOTE: `failure_message` is only called when `mathces?` returns `false`.
# https://rubydoc.info/github/rspec/rspec-expectations/RSpec/Matchers/MatcherProtocol#failure_message-instance_method
#
def failure_message
"expected #{klass} to be a descendant of `#{base_klass}`"
end
##
# NOTE: `failure_message_when_negated` is only called when `mathces?` returns `false`.
# https://rubydoc.info/github/rspec/rspec-expectations/RSpec/Matchers/MatcherProtocol#failure_message-instance_method
#
def failure_message_when_negated
"expected #{klass} NOT to be a descendant of `#{base_klass}`"
end
private
attr_reader :klass, :base_klass
end
end
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems