1 files changed, 47 insertions, 0 deletions
diff --git a/test/ruby/test_exception.rb b/test/ruby/test_exception.rb
index c49de80113..3268096463 100644
--- a/test/ruby/test_exception.rb
+++ b/test/ruby/test_exception.rb
@@ -769,4 +769,51 @@ $stderr = $stdout; raise "\x82\xa0"') do |outs, errs, status|
     assert_raise(NameError) {a.instance_eval("foo")}
     assert_raise(NoMethodError, bug10969) {a.public_send("bar", true)}
   end
+
+  def test_undefined_backtrace
+    assert_separately([], "#{<<-"begin;"}\n#{<<-"end;"}")
+    begin;
+      class Exception
+        undef backtrace
+      end
+
+      assert_raise(RuntimeError) {
+        raise RuntimeError, "hello"
+      }
+    end;
+  end
+
+  def test_redefined_backtrace
+    assert_separately([], "#{<<-"begin;"}\n#{<<-"end;"}")
+    begin;
+      $exc = nil
+
+      class Exception
+        undef backtrace
+        def backtrace
+          $exc = self
+        end
+      end
+
+      e = assert_raise(RuntimeError) {
+        raise RuntimeError, "hello"
+      }
+      assert_same(e, $exc)
+    end;
+  end
+
+  def test_wrong_backtrace
+    assert_separately([], "#{<<-"begin;"}\n#{<<-"end;"}")
+    begin;
+      class Exception
+        undef backtrace
+        def backtrace(a)
+        end
+      end
+
+      assert_raise(RuntimeError) {
+        raise RuntimeError, "hello"
+      }
+    end;
+  end
 end