diff --git a/test/unit/user_test.rb b/test/unit/user_test.rb
index 82113df..4a1cb33 100644
--- a/test/unit/user_test.rb
+++ b/test/unit/user_test.rb
@@ -54,7 +54,8 @@ class UserTest < ActiveSupport::TestCase
     u = User.new
     u.mail = ''
     assert !u.valid?
-    assert_equal I18n.translate('activerecord.errors.messages.blank'), u.errors.on(:mail)
+    assert_equal I18n.translate('activerecord.errors.messages.blank'),
+                 u.errors[:mail].to_s
   end
 
   def test_create
@@ -99,7 +100,8 @@ class UserTest < ActiveSupport::TestCase
       u.login = 'NewUser'
       u.password, u.password_confirmation = "password", "password"
       assert !u.save
-      assert_equal I18n.translate('activerecord.errors.messages.taken'), u.errors.on(:login)
+      assert_equal I18n.translate('activerecord.errors.messages.taken'),
+                   u.errors[:login].to_s
     end
   end
 
@@ -113,7 +115,8 @@ class UserTest < ActiveSupport::TestCase
     u.login = 'newuser2'
     u.password, u.password_confirmation = "password", "password"
     assert !u.save
-    assert_equal I18n.translate('activerecord.errors.messages.taken'), u.errors.on(:mail)
+    assert_equal I18n.translate('activerecord.errors.messages.taken'),
+                 u.errors[:mail].to_s
   end
 
   def test_update