added user test, basic user methods

app/presenters/tag_set_presenter.rb

@@ -0,0 +1,41 @@
+=begin rdoc
+  A tag set represents a set of tags that are displayed together.
+  This class makes it easy to fetch the categories for all the 
+  tags in one call instead of fetching them sequentially.
+=end
+
+class TagSetPresenter < Presenter
+  def initialize(source)
+    @category_cache = {}
+  end
+  
+  def to_list_html(template, options = {})
+    ul_class_attribute = options[:ul_class] ? %{class="#{options[:ul_class]}"} : ""
+    ul_id_attribute = options[:ul_id] ? %{id="#{options[:ul_id]}"} : ""
+
+    html = ""
+    html << "<ul #{ul_class_attribute} #{ul_id_attribute}>"
+    @tags.each do |tag|
+      html << build_list_item(tag, template, options)
+    end
+    html << "</ul>"
+    html
+  end
+
+private
+  def fetch_categories(tags)
+  end
+  
+  def build_list_item(tag, template, options)
+    html = ""
+    html << "<li>"
+    
+    if options[:show_extra_links]
+    end
+    
+    humanized_tag = tag.tr("_", " ")
+    html << %{a href="/posts?tags=#{u(tag)}">#{h(humanized_tag)}</a>}
+    html << "</li>"
+    html
+  end
+end