1 files changed, 10 insertions, 0 deletions
diff --git a/test/ruby/test_thread.rb b/test/ruby/test_thread.rb
index b460cadea9..d0c35d8273 100644
--- a/test/ruby/test_thread.rb
+++ b/test/ruby/test_thread.rb
@@ -516,4 +516,14 @@ class TestThreadGroup < Test::Unit::TestCase
     c.class_eval { def initialize; end }
     assert_raise(ThreadError) { c.new.start }
   end
+
+  def test_backtrace
+    Thread.new{
+      assert_equal(Array, Thread.main.backtrace.class)
+    }.join
+
+    t = Thread.new{}
+    t.join
+    assert_equal(nil, t.backtrace)
+  end
 end