diff --git a/tests/unit/test_server.py b/tests/unit/test_server.py
new file mode 100644
index 0000000..532bf12
--- /dev/null
+++ b/tests/unit/test_server.py
@@ -0,0 +1,16 @@
+""" The module umodbus.server is mainly covered through system tests. Only
+those parts which can't be tested by system tests should be tested using
+unit tests.
+"""
+import pytest
+
+from umodbus.server import RequestHandler
+
+
+def test_handle_raising_exception():
+    """ Test tests RequestHandler.handle() which is called when an instance
+    of RequestHandler is created. This method should reraise exception if one
+    occurs.
+    """
+    with pytest.raises(AttributeError):
+        RequestHandler(None, None, None)