diff --git a/test/unit/helpers/application_helper_test.rb b/test/unit/helpers/application_helper_test.rb
index b3757b092..1ef2ff0f7 100644
--- a/test/unit/helpers/application_helper_test.rb
+++ b/test/unit/helpers/application_helper_test.rb
@@ -970,25 +970,27 @@ RAW
     end
   end
 
-  def test_avatar
-    # turn on avatars
-    Setting.gravatar_enabled = '1'
-    assert avatar(User.find_by_mail('jsmith@somenet.foo')).include?(Digest::MD5.hexdigest('jsmith@somenet.foo'))
-    assert avatar('jsmith <jsmith@somenet.foo>').include?(Digest::MD5.hexdigest('jsmith@somenet.foo'))
-    # Default size is 50
-    assert avatar('jsmith <jsmith@somenet.foo>').include?('size=50')
-    assert avatar('jsmith <jsmith@somenet.foo>', :size => 24).include?('size=24')
-    # Non-avatar options should be considered html options
-    assert avatar('jsmith <jsmith@somenet.foo>', :title => 'John Smith').include?('title="John Smith"')
-    # The default class of the img tag should be gravatar
-    assert avatar('jsmith <jsmith@somenet.foo>').include?('class="gravatar"')
-    assert !avatar('jsmith <jsmith@somenet.foo>', :class => 'picture').include?('class="gravatar"')
-    assert_nil avatar('jsmith')
-    assert_nil avatar(nil)
+  def test_avatar_enabled
+    with_settings :gravatar_enabled => '1' do
+      assert avatar(User.find_by_mail('jsmith@somenet.foo')).include?(Digest::MD5.hexdigest('jsmith@somenet.foo'))
+      assert avatar('jsmith <jsmith@somenet.foo>').include?(Digest::MD5.hexdigest('jsmith@somenet.foo'))
+      # Default size is 50
+      assert avatar('jsmith <jsmith@somenet.foo>').include?('size=50')
+      assert avatar('jsmith <jsmith@somenet.foo>', :size => 24).include?('size=24')
+      # Non-avatar options should be considered html options
+      assert avatar('jsmith <jsmith@somenet.foo>', :title => 'John Smith').include?('title="John Smith"')
+      # The default class of the img tag should be gravatar
+      assert avatar('jsmith <jsmith@somenet.foo>').include?('class="gravatar"')
+      assert !avatar('jsmith <jsmith@somenet.foo>', :class => 'picture').include?('class="gravatar"')
+      assert_nil avatar('jsmith')
+      assert_nil avatar(nil)
+    end
+  end
 
-    # turn off avatars
-    Setting.gravatar_enabled = '0'
-    assert_equal '', avatar(User.find_by_mail('jsmith@somenet.foo'))
+  def test_avatar_disabled
+    with_settings :gravatar_enabled => '0' do
+      assert_equal '', avatar(User.find_by_mail('jsmith@somenet.foo'))
+    end
   end
 
   def test_link_to_user