Enable Ruby warnings for tests and fix them

Rakefile

@@ -2,5 +2,8 @@
 require "bundler/gem_tasks"
 require 'rspec/core/rake_task'
 
-RSpec::Core::RakeTask.new(:spec)
+RSpec::Core::RakeTask.new(:spec) do |t|
+  t.ruby_opts = "-w"
+end
+
 task :default => :spec

lib/classy_enum/base.rb

@@ -67,6 +67,7 @@ def build(value, options={})
           # Subclass the base class and make it behave like the value that it is
           object = Class.new(base_class) {
             instance_variable_set(:@option, value)
+            instance_variable_set(:@index, 0)
             delegate :blank?, :nil?, :to => :option
           }.new
         end

spec/classy_enum_inheritance_spec.rb

@@ -14,8 +14,8 @@ class ProjectTier::Two < ProjectTier::One
 
 describe 'Classy Enum inheritance' do
   it 'should inherit from the previous class' do
-    ProjectTier::One.inherited_properties.should == [1,2,3]
-    ProjectTier::Two.inherited_properties.should == [1,2,3,4,5,6]
+    ProjectTier::One.inherited_properties.should eql([1,2,3])
+    ProjectTier::Two.inherited_properties.should eql([1,2,3,4,5,6])
   end
 
   it 'should instantiate the subclass' do