Added equality for Pickle::Ref, to enable more robust specs in the Api

lib/pickle/ref.rb

@@ -32,6 +32,10 @@ def inspect
       "#<Pickle::Ref '#{to_s}'>"
     end
 
+    def ==(other)
+      [factory, index, label] == [other.factory, other.index, other.label]
+    end
+
   protected
     def validate!
       raise InvalidPickleRefError, "#{inspect} requires a factory or label" if factory.blank? && label.blank?

spec/pickle/ref_spec.rb

@@ -13,6 +13,30 @@
     end
   end
 
+  describe "equality: two pickle refs are equal when their index, factory, label are equal.  ie:" do
+    [
+      ['the user: "fred"', {:label => "fred", :factory => 'user'}],
+      ['user', 'another user'], 
+      ['the 2nd user', {:index => 1, :factory => 'user'}]
+    ].each do |pair|
+      describe Pickle::Ref.new(pair.first).inspect do
+        subject { Pickle::Ref.new(pair.first) }
+        it { should == Pickle::Ref.new(pair.last) }
+      end
+    end
+
+    [
+      ['the user: "geoff"', {:label => "fred", :factory => 'user'}],
+      ['user', '1st user'], 
+      ['the 2nd user', {:index => 1, :factory => 'project'}]
+    ].each do |pair|
+      describe Pickle::Ref.new(pair.first).inspect do
+        subject { Pickle::Ref.new(pair.first) }
+        it { should_not == Pickle::Ref.new(pair.last) }
+      end
+    end
+  end
+
   describe "(factory) " do
     shared_examples_for 'pickle ref with :factory => "colour"' do
       its(:index) { should be_nil }