2 files changed, 18 insertions, 0 deletions
diff --git a/test/thread/test_cv.rb b/test/thread/test_cv.rb
index 49fee24249..db6067e71c 100644
--- a/test/thread/test_cv.rb
+++ b/test/thread/test_cv.rb
@@ -4,6 +4,12 @@ require 'tmpdir'
 require_relative '../ruby/envutil'
 
 class TestConditionVariable < Test::Unit::TestCase
+  def test_initialized
+    assert_raise(TypeError) {
+      ConditionVariable.allocate.wait(nil)
+    }
+  end
+
   def test_condvar_signal_and_wait
     mutex = Mutex.new
     condvar = ConditionVariable.new
diff --git a/test/thread/test_queue.rb b/test/thread/test_queue.rb
index b886fcc27a..6a3397734a 100644
--- a/test/thread/test_queue.rb
+++ b/test/thread/test_queue.rb
@@ -5,6 +5,18 @@ require 'timeout'
 require_relative '../ruby/envutil'
 
 class TestQueue < Test::Unit::TestCase
+  def test_queue_initialized
+    assert_raise(TypeError) {
+      Queue.allocate.push(nil)
+    }
+  end
+
+  def test_sized_queue_initialized
+    assert_raise(TypeError) {
+      SizedQueue.allocate.push(nil)
+    }
+  end
+
   def test_queue
     grind(5, 1000, 15, Queue)
   end