1 files changed, 37 insertions, 0 deletions
diff --git a/test/fiber/test_mutex.rb b/test/fiber/test_mutex.rb
index 393a44fc2f..21034128a1 100644
--- a/test/fiber/test_mutex.rb
+++ b/test/fiber/test_mutex.rb
@@ -47,6 +47,43 @@ class TestFiberMutex < Test::Unit::TestCase
     thread.join
   end
 
+  def test_condition_variable
+    mutex = Mutex.new
+    condition = ConditionVariable.new
+
+    signalled = 0
+
+    thread = Thread.new do
+      scheduler = Scheduler.new
+      Thread.current.scheduler = scheduler
+
+      Fiber.schedule do
+        mutex.synchronize do
+          3.times do
+            condition.wait(mutex)
+            signalled += 1
+          end
+        end
+      end
+
+      Fiber.schedule do
+        3.times do
+          mutex.synchronize do
+            condition.signal
+          end
+
+          sleep 0.1
+        end
+      end
+
+      scheduler.run
+    end
+
+    thread.join
+
+    assert signalled > 1
+  end
+
   def test_mutex_deadlock
     err = /No live threads left. Deadlock\?/
     assert_in_out_err %W[-I#{__dir__} -], <<-RUBY, ['in synchronize'], err, success: false