Improve value constants (#46)

* improve value constants with value methods

* add specs & docs

Author: xronos-i-am

README.md

@@ -74,6 +74,8 @@ end
 
 Product::COLOR.values # => ["red", "green"]
 Product::COLOR::RED # => "red"
+Product::COLOR::RED.red? # => true
+Product::COLOR::RED.human_name # => "Красный"
 Product::COLOR::RED__GREEN # => ["red", "green"]
 
 Product::COLOR["red"].red? # => true

lib/enum_machine/build_enum_class.rb

@@ -36,7 +36,7 @@ def self.human_name_for(name)
         end
 
         enum_values.each do |enum_value|
-          const_set enum_value.underscore.upcase, enum_value.to_s.freeze
+          const_set enum_value.underscore.upcase, value_class.new(enum_value).freeze
         end
 
         aliases.each_key do |key|

spec/enum_machine/active_record_enum_spec.rb

@@ -41,6 +41,7 @@
     m = model.new(color: "red")
     expect(m.color.human_name).to eq "Красный"
     expect(model::COLOR.human_name_for("red")).to eq "Красный"
+    expect(model::COLOR::RED.human_name).to eq "Красный"
   end
 
   context "when enum in CamelCase" do

spec/enum_machine/driver_simple_class_spec.rb

@@ -36,6 +36,9 @@ def initialize(state)
   it { expect { item.state.last__in_delivery? }.to raise_error(NoMethodError) }
   it { expect(item.state).to eq "choice" }
   it { expect(item.state.frozen?).to be true }
+  it { expect(TestClass::STATE::IN_DELIVERY.in_delivery?).to be true }
+  it { expect(TestClass::STATE::IN_DELIVERY.choice?).to be false }
+  it { expect(TestClass::STATE::IN_DELIVERY.frozen?).to be true }
 
   describe "module" do
     it "returns state string" do