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How to use undeclared_descriptions method of Capybara Package

Best Capybara code snippet using Capybara.undeclared_descriptions

filter_set.rb

Source:filter_set.rb

...22      end23      def describe(what = nil, &block)24        case what25        when nil26          undeclared_descriptions.push block27        when :node_filters28          node_filter_descriptions.push block29        when :expression_filters30          expression_filter_descriptions.push block31        else32          raise ArgumentError, 'Unknown description type'33        end34      end35      def description(node_filters: true, expression_filters: true, **options)36        opts = options_with_defaults(options)37        description = +''38        description << undeclared_descriptions.map { |desc| desc.call(**opts).to_s }.join39        description << expression_filter_descriptions.map { |desc| desc.call(**opts).to_s }.join if expression_filters40        description << node_filter_descriptions.map { |desc| desc.call(**opts).to_s }.join if node_filters41        description42      end43      def descriptions44        Capybara::Helpers.warn 'DEPRECATED: FilterSet#descriptions is deprecated without replacement'45        [undeclared_descriptions, node_filter_descriptions, expression_filter_descriptions].flatten46      end47      def import(name, filters = nil)48        filter_selector = filters.nil? ? ->(*) { true } : ->(filter_name, _) { filters.include? filter_name }49        self.class[name].tap do |f_set|50          expression_filters.merge!(f_set.expression_filters.select(&filter_selector))51          node_filters.merge!(f_set.node_filters.select(&filter_selector))52          f_set.undeclared_descriptions.each { |desc| describe(&desc) }53          f_set.expression_filter_descriptions.each { |desc| describe(:expression_filters, &desc) }54          f_set.node_filter_descriptions.each { |desc| describe(:node_filters, &desc) }55        end56        self57      end58      class << self59        def all60          @filter_sets ||= {} # rubocop:disable Naming/MemoizedInstanceVariableName61        end62        def [](name)63          all.fetch(name.to_sym) { |set_name| raise ArgumentError, "Unknown filter set (:#{set_name})" }64        end65        def add(name, &block)66          all[name.to_sym] = FilterSet.new(name.to_sym, &block)67        end68        def remove(name)69          all.delete(name.to_sym)70        end71      end72    protected73      def undeclared_descriptions74        @descriptions[:undeclared]75      end76      def node_filter_descriptions77        @descriptions[:node_filters]78      end79      def expression_filter_descriptions80        @descriptions[:expression_filters]81      end82    private83      def options_with_defaults(options)84        expression_filters.chain(node_filters)85                          .select { |_n, filter| filter.default? }86                          .each_with_object(options.dup) do |(name, filter), opts|87          opts[name] = filter.default unless opts.key?(name)...

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