diff --git a/test/unit/issue_nested_set_test.rb b/test/unit/issue_nested_set_test.rb
index 0d83671e0..3a53eb3af 100644
--- a/test/unit/issue_nested_set_test.rb
+++ b/test/unit/issue_nested_set_test.rb
@@ -302,6 +302,17 @@ class IssueNestedSetTest < ActiveSupport::TestCase
     assert_equal (50 * 20 + 20 * 10) / 30, parent.reload.done_ratio
   end
 
+  def test_parent_done_ratio_with_child_estimate_to_0_should_reach_100
+    parent = Issue.generate!
+    issue1 = Issue.generate!(:parent_issue_id => parent.id)
+    issue2 = Issue.generate!(:parent_issue_id => parent.id, :estimated_hours => 0)
+    assert_equal 0, parent.reload.done_ratio
+    issue1.reload.update_attribute :status_id, 5
+    assert_equal 50, parent.reload.done_ratio
+    issue2.reload.update_attribute :status_id, 5
+    assert_equal 100, parent.reload.done_ratio
+  end
+
   def test_parent_estimate_should_be_sum_of_leaves
     parent = Issue.generate!
     Issue.generate!(:estimated_hours => nil, :parent_issue_id => parent.id)