diff --git a/test/functional/attachments_controller_test.rb b/test/functional/attachments_controller_test.rb
index 11c3faa95..0aed2395c 100644
--- a/test/functional/attachments_controller_test.rb
+++ b/test/functional/attachments_controller_test.rb
@@ -96,8 +96,13 @@ class AttachmentsControllerTest < ActionController::TestCase
   end
 
   def test_save_diff_type
-    @request.session[:user_id] = 1 # admin
+    user1 = User.find(1)
+    user1.pref[:diff_type] = nil
+    user1.preference.save
     user = User.find(1)
+    assert_nil user.pref[:diff_type]
+
+    @request.session[:user_id] = 1 # admin
     get :show, :id => 5
     assert_response :success
     assert_template 'diff'
diff --git a/test/functional/repositories_git_controller_test.rb b/test/functional/repositories_git_controller_test.rb
index e8eb69f18..a3ecc09a7 100644
--- a/test/functional/repositories_git_controller_test.rb
+++ b/test/functional/repositories_git_controller_test.rb
@@ -385,8 +385,13 @@ class RepositoriesGitControllerTest < ActionController::TestCase
     end
 
     def test_save_diff_type
-      @request.session[:user_id] = 1 # admin
+      user1 = User.find(1)
+      user1.pref[:diff_type] = nil
+      user1.preference.save
       user = User.find(1)
+      assert_nil user.pref[:diff_type]
+
+      @request.session[:user_id] = 1 # admin
       get :diff,
           :id   => PRJ_ID,
           :rev  => '2f9c0091c754a91af7a9c478e36556b4bde8dcf7'