Add spec for AsciicastDecorator#embed_script

app/decorators/asciicast_decorator.rb

@@ -100,7 +100,9 @@ class AsciicastDecorator < ApplicationDecorator
   end
 
   def embed_script
-    %(<script type="text/javascript" src="#{h.asciicast_url(model, :format => :js)}" id="asciicast-#{id}" async></script>)
+    src = h.asciicast_url(model, :format => :js)
+    id = "asciicast-#{id}"
+    %(<script type="text/javascript" src="#{src}" id="#{id}" async></script>)
   end
 
   private

spec/decorators/asciicast_decorator_spec.rb

@@ -240,4 +240,14 @@ describe AsciicastDecorator do
   describe '#other_by_user' do
     pending
   end
+
+  describe '#embed_script' do
+    before do
+      asciicast.stub!(:id => 123)
+    end
+
+    it 'should be an async script tag including asciicast id' do
+      expect(decorated.embed_script).to match(/^<script[^>]+\b123\b[^>]+><\/script>/)
+    end
+  end
 end