diff -r f5c7cc60ead2 test/functional/issues_controller_test.rb
--- a/test/functional/issues_controller_test.rb	Tue Apr 25 17:44:08 2017 +0000
+++ b/test/functional/issues_controller_test.rb	Mon May 08 08:13:17 2017 +0900
@@ -4987,4 +4987,27 @@
     assert_response :success
     assert_select 'a[href=?][onclick=?]', "/issues/1", "", :text => 'Cancel'
   end
+
+  def test_show_should_display_with_assignees_gravatars
+    @request.session[:user_id] = 1
+    issue = Issue.find(1)
+
+    with_settings :gravatar_enabled => '1' do
+      get :show, :id => issue.id
+      assert_equal issue.assigned_to_id, nil
+      assert_select 'div.gravatar-with-child' do
+        assert_select 'img', 1
+      end
+
+      issue.update :assigned_to_id => User.find(2).id
+      get :show, :id => issue.id
+      assert_equal issue.assigned_to_id, 2
+    end
+
+    assert_select 'div.gravatar-with-child' do
+      assert_select 'img', 2
+      assert_select 'img.gravatar', 1
+      assert_select 'img.gravatar-child', 1
+    end
+  end
 end