Fix feature tests

app/models/snippet.rb

@@ -12,6 +12,11 @@ class Snippet < ActiveRecord::Base
   cache_markdown_field :title, pipeline: :single_line
   cache_markdown_field :content
+  # Aliases to make application_helper#edited_time_ago_with_tooltip helper work properly with snippets.
+  # See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10392/diffs#note_28719102
+  alias_attribute :last_edited_at, :updated_at
+  alias_attribute :last_edited_by, :updated_by
+
   # If file_name changes, it invalidates content
   alias_method :default_content_html_invalidator, :content_html_invalidated?
   def content_html_invalidated?