1 files changed, 36 insertions, 1 deletions
diff --git a/test/ruby/test_backtrace.rb b/test/ruby/test_backtrace.rb
index cfdbd72d9f..ebbde9f060 100644
--- a/test/ruby/test_backtrace.rb
+++ b/test/ruby/test_backtrace.rb
@@ -1,5 +1,5 @@
-
 require 'test/unit'
+require 'thread'
 
 class TestBacktrace < Test::Unit::TestCase
   def test_exception
@@ -91,4 +91,39 @@ class TestBacktrace < Test::Unit::TestCase
     }
     assert_equal(cs, locs)
   end
+
+  def th_rec q, n=10
+    if n > 1
+      th_rec q, n-1
+    else
+      q.pop
+    end
+  end
+
+  def test_thread_backtrace
+    begin
+      q = Queue.new
+      th = Thread.new{
+        th_rec q
+      }
+      sleep 0.5
+      th_backtrace = th.backtrace
+      th_locations = th.backtrace_locations
+
+      assert_equal(10, th_backtrace.count{|e| e =~ /th_rec/})
+      assert_equal(th_backtrace, th_locations.map{|e| e.to_s})
+      assert_equal(th_backtrace, th.backtrace(0))
+      assert_equal(th_locations.map{|e| e.to_s},
+                   th.backtrace_locations(0).map{|e| e.to_s})
+      th_backtrace.size.times{|n|
+        assert_equal(n, th.backtrace(0, n).size)
+        assert_equal(n, th.backtrace_locations(0, n).size)
+      }
+      n = th_backtrace.size
+      assert_equal(n, th.backtrace(0, n + 1).size)
+      assert_equal(n, th.backtrace_locations(0, n + 1).size)
+    ensure
+      q << true
+    end
+  end
 end