Don't clear plugins in tests (#16258).

git-svn-id: http://svn.redmine.org/redmine/trunk@12987 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/functional/admin_controller_test.rb

@@ -103,11 +103,12 @@ class AdminControllerTest < ActionController::TestCase
   end
 
   def test_no_plugins
-    Redmine::Plugin.clear
+    Redmine::Plugin.stubs(:registered_plugins).returns({})
 
     get :plugins
     assert_response :success
     assert_template 'plugins'
+    assert_equal [], assigns(:plugins)
   end
 
   def test_plugins