Implement two pairs

README.md

@@ -8,3 +8,8 @@ A “hand” in poker consists of five playing cards drawn from a standard deck.
 
 TBA
 
+## After the video
+
+1) Finish implementing all the poker hands
+
+in a "shameless green" style

lib/hand.rb

@@ -26,6 +26,8 @@ def rank
       { :type => :flush }
     elsif has_three
       { :type => :three_of_a_kind }
+    elsif has_two_pairs
+      { :type => :two_pair }
     elsif has_two
       { :type => :pair }
     else
@@ -59,6 +61,11 @@ def has_three
     pip_count.values.include?(3)
   end
 
+  def has_two_pairs
+    grouped_pip_counts = pip_count.values.group_by { |i| i }
+    grouped_pip_counts[2] && grouped_pip_counts[2].size == 2
+  end
+
   def has_two
     pip_count.values.include?(2)
   end

spec/hand_spec.rb

@@ -11,6 +11,9 @@
   let(:highest_hand) {
     HandParser.new.parse(["4h", "5d", "6d", "7d", "9d"])
   }
+  let(:two_pair_hand) {
+    HandParser.new.parse(["4h", "4d", "6d", "6h", "9s"])
+  }
   let(:three_of_a_kind_hand) {
     HandParser.new.parse(["5h", "5d", "5s", "7d", "8d"])
   }
@@ -87,5 +90,9 @@
     it "works with a straight with high ace" do
       expect(straight_hand_high_ace.rank).to eq ({:type => :straight})
     end
+
+    it "works with a two pair hand" do
+      expect(two_pair_hand.rank).to eq ({:type => :two_pair})
+    end
   end
 end