qemu.test.usb_hotplug: Add a negative test

Signed-off-by: NQingtang Zhou <qzhou@redhat.com>

qemu/tests/cfg/usb.cfg

@@ -126,6 +126,17 @@
             monitor_type = human
             monitors = hmp1
             main_monitor = hmp1
+            variants:
+                - usb_normal_test:
+                - usb_negative_test:
+                    only ehci
+                    only usb_hub
+                    only usb_default
+                    # Note: This is a workaround for the multifunction
+                    # code in qemu_vm module.
+                    usb_type_usbtest = usb-ehci
+                    usb_negative_test = "yes"
+                    usb_reply_msg = "Warning: speed mismatch trying to attach usb device"
         - usb_storage:
             type = usb_storage
             images += " stg"

qemu/tests/usb_hotplug.py

-import logging, re, uuid
+import logging
 from autotest.client.shared import error
-from autotest.client import utils
 
 @error.context_aware
 def run_usb_hotplug(test, params, env):
@@ -28,6 +27,12 @@ def run_usb_hotplug(test, params, env):
 
     error.context("Plugin usb device", logging.info)
     reply = vm.monitor.cmd(monitor_add)
+    if params.get("usb_negative_test") == "yes":
+        if params["usb_reply_msg"] not in reply:
+            raise error.TestFail("Could not get expected warning msg in"
+                            " negative test, monitor returns: '%s'" % reply)
+        return
+
     if reply.find("Parameter 'driver' expects a driver name") != -1:
         raise error.TestNAError("usb device %s not available" % device)