Add spec for orchestration stack textual summary helper
user
```ruby
require "spec_helper"

describe OrchestrationStackHelper do
  before :each do
    @record = FactoryGirl.create(:orchestration_stack)
  end

  context "::TextualSummary" do
    it "defines textual_group_lifecycle" do
      expect(self).to respond_to(:textual_group_lifecycle)
    end

    describe "#textual_group_lifecycle" do
      it "should includes retirement_date" do
        expect(self.textual_group_lifecycle).to include(:retirement_date)
      end
    end

    it "defines textual_retirement_date" do
      expect(self).to respond_to(:textual_retirement_date)
    end

    describe "#textual_retirement_date" do
      it "should returns 'Never' if nil values is passed" do
        @record.retires_on = nil
        expect(self.textual_retirement_date).to include(:value => "Never")
      end

      it "should returns date in %x format" do
        @record.retires_on = Date.new(2015, 11, 01)
        expect(self.textual_retirement_date).to include(:value => "11/01/15")
      end
    end
  end
end
```
assistant