diff --git a/test/test_ev.py b/test/test_ev.py
new file mode 100644
index 0000000..6353fe8
--- /dev/null
+++ b/test/test_ev.py
@@ -0,0 +1,55 @@
+# -*- coding: utf-8 -*-
+"""Unit test for miot_ev.py."""
+import os
+import pytest
+
+# pylint: disable=import-outside-toplevel, disable=unused-argument
+
+
+@pytest.mark.github
+def test_mev_timer_and_fd():
+    from miot.miot_ev import MIoTEventLoop, TimeoutHandle
+
+    mev = MIoTEventLoop()
+    assert mev
+    event_fd: os.eventfd = os.eventfd(0, os.O_NONBLOCK)
+    assert event_fd
+    timer4: TimeoutHandle = None
+
+    def event_handler(event_fd):
+        value: int = os.eventfd_read(event_fd)
+        if value == 1:
+            mev.clear_timeout(timer4)
+            print('cancel timer4')
+        elif value == 2:
+            print('event write twice in a row')
+        elif value == 3:
+            mev.set_read_handler(event_fd, None, None)
+            os.close(event_fd)
+            event_fd = None
+            print('close event fd')
+
+    def timer1_handler(event_fd):
+        os.eventfd_write(event_fd, 1)
+
+    def timer2_handler(event_fd):
+        os.eventfd_write(event_fd, 1)
+        os.eventfd_write(event_fd, 1)
+
+    def timer3_handler(event_fd):
+        os.eventfd_write(event_fd, 3)
+
+    def timer4_handler(event_fd):
+        raise ValueError('unreachable code')
+
+    mev.set_read_handler(
+        event_fd, event_handler, event_fd)
+
+    mev.set_timeout(500, timer1_handler, event_fd)
+    mev.set_timeout(1000, timer2_handler, event_fd)
+    mev.set_timeout(1500, timer3_handler, event_fd)
+    timer4 = mev.set_timeout(2000, timer4_handler, event_fd)
+
+    mev.loop_forever()
+    # Loop will exit when there are no timers or fd handlers.
+    mev.loop_stop()