1 files changed, 12 insertions, 0 deletions
diff --git a/test/ruby/test_fiber.rb b/test/ruby/test_fiber.rb
index e3e40566f8..ed7ecc71ae 100644
--- a/test/ruby/test_fiber.rb
+++ b/test/ruby/test_fiber.rb
@@ -208,5 +208,17 @@ class TestFiber < Test::Unit::TestCase
       GC.start
     }, bug4612
   end
+
+  def test_no_valid_cfp
+    bug5083 = '[ruby-dev:44208]'
+    error = assert_raise(RuntimeError) do
+      Fiber.new(&Module.method(:nesting)).resume
+    end
+    assert_equal("Can't call on top of Fiber or Thread", error.message, bug5083)
+    error = assert_raise(RuntimeError) do
+      Fiber.new(&Module.method(:undef_method)).resume(:to_s)
+    end
+    assert_equal("Can't call on top of Fiber or Thread", error.message, bug5083)
+  end
 end