Improve Doc#name and Doc#slug

lib/docs/core/doc.rb

@@ -44,14 +44,11 @@ module Docs
       end
 
       def name
-        @name || super.try(:demodulize)
+        @name || super.demodulize
       end
 
       def slug
-        slug = @slug || (
-          raise "Slug must be set explicitly when name (#{name}) consists of anything else than [\\w\\.%]" if /[^\w\.%]/ =~ name
-          name.try(:downcase)
-        )
+        slug = @slug || default_slug || raise('slug is required')
         version? ? "#{slug}~#{version_slug}" : slug
       end
 
@@ -119,6 +116,11 @@ module Docs
 
       private
 
+      def default_slug
+        return if name =~ /[^A-Za-z0-9_]/
+        name.downcase
+      end
+
       def store_page?(page)
         page[:entries].present?
       end

test/lib/docs/core/manifest_test.rb

@@ -3,7 +3,9 @@ require 'docs'
 
 class ManifestTest < MiniTest::Spec
   let :doc do
-    Class.new Docs::Doc
+    doc = Class.new Docs::Doc
+    doc.name = 'TestDoc'
+    doc
   end
 
   let :store do