Move updater mock into test class namespace

Library/Homebrew/test/test_updater.rb

@@ -2,7 +2,8 @@ require 'testing_env'
 require 'cmd/update'
 require 'yaml'
 
-class UpdaterMock < Updater
+class UpdaterTests < Test::Unit::TestCase
+  class UpdaterMock < ::Updater
     def in_repo_expect(cmd, output = '')
       @outputs  ||= Hash.new { |h,k| h[k] = [] }
       @expected ||= []
@@ -17,7 +18,7 @@ class UpdaterMock < Updater
         @called << cmd
         @outputs[cmd].shift
       else
-      raise "#<#{self.class.name} #{object_id}> unexpectedly called backticks: `#{cmd}'"
+        raise "#{inspect} unexpectedly called backticks: `#{cmd}`"
       end
     end
 
@@ -26,9 +27,8 @@ class UpdaterMock < Updater
     def expectations_met?
       @expected == @called
     end
-end
+  end
 
-class UpdaterTests < Test::Unit::TestCase
   def fixture(name)
     self.class.fixture_data[name]
   end