implemented #current? for party_membership and #empty? for reponse

lib/parliament/decorators/party_membership.rb

@@ -12,6 +12,12 @@ def start_date
       def end_date
         respond_to?(:partyMembershipEndDate) ? DateTime.parse(partyMembershipEndDate) : nil
       end
+
+      def current?
+        has_end_date = respond_to?(:partyMembershipEndDate)
+
+        !has_end_date
+      end
     end
   end
 end

lib/parliament/response.rb

@@ -5,7 +5,7 @@ class Response
     include Enumerable
     extend Forwardable
     attr_reader :nodes
-    def_delegators :@nodes, :size, :each, :select, :map, :select!, :map!, :count, :length, :[]
+    def_delegators :@nodes, :size, :each, :select, :map, :select!, :map!, :count, :length, :[], :empty?
 
     def initialize(nodes)
       @nodes = nodes

spec/parliament/decorators/party_membership_spec.rb

@@ -63,4 +63,12 @@
       end
     end
   end
+
+  describe '#current?' do
+    it 'Grom::Node returns the correct value for a current or non current party membership' do
+      party_membership_results = @party_membership_nodes.map(&:current?)
+
+      expect(party_membership_results).to eq([false, true])
+    end
+  end
 end

spec/parliament/response_spec.rb

@@ -44,6 +44,10 @@
     it 'should respond to []' do
       expect(subject).to respond_to(:[])
     end
+
+    it 'should respond to empty?' do
+      expect(subject).to respond_to(:empty?)
+    end
   end
 
   describe '#filter' do