autotest: add wifi tests for roaming on resume

server/site_tests/network_WiFiRoaming/005SuspendRoam

+# Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# This test run is designed to test that the connection manager is able
+# to roam to a previously connected AP when it loses connectivity to its
+# current AP on resume.  To accomplish this, we join one AP (so we are
+# sure that flimflam remembers it), then join a second AP which we
+# shut down while the DUT is suspended.  We sit around and observe
+# if and how long it takes for the connection manager to re-acquire
+# connectivity to the first AP.  We expect the DUT will resume, find
+# the previous AP is gone, and then roam to the other AP.
+{ "name":"SuspendRoam",
+  "steps":[
+    [ "create",         { "type":"hostap" } ],
+
+    # NB: use a fixed SSID so we know what to reference below
+    [ "config",         { "channel":"2412", "mode":"11g",
+                          "ssid": 'SuspendRoam_t1'} ],
+
+    # Connect to the first AP.  This just guarantees that this AP has
+    # been placed in the connection manager profile.
+    [ "connect",        { "security":"none" } ],
+    [ "client_ping",    { "count":"10" } ],
+    [ "deconfig" ],
+
+    # Configure and connect to the second AP.
+    [ "config",         { "channel":"2462", "mode":"11g",
+                          "ssid_suffix": 't2'} ],
+    [ "connect",        { "security":"none" } ],
+    [ "client_ping",    { "count":"10" } ],
+    [ "deconfig" ],
+
+    # Ask the DUT to sleep for 20 seconds while we switch things around,
+    # then see how long it takes for the DUT to return the service to the
+    # "ready" state.  As a result, the arguments to this command are a
+    # combination of suspend and wait_service arguments.  In this case,
+    # except for "suspend_time", all arguments are to wait_change.  Note
+    # that the wait_change occurs AFTER the suspend, 20 seconds later in
+    # this specific example.  Note also that we must specify the SSID of
+    # the previous AP to wait for; otherwise this will wait for the AP
+    # we just deconfig'd to come ready (and fail).
+    [ "wait_service_suspend_bg",
+                        { "suspend_time": "20",  # How long to sleep
+                          "run_timeout":20,      # Maximum time to wait
+                          "debug":True,          # Output all state changes
+                          "states": [             # Wait for "ready" state
+                            ('SuspendRoam_t1', 'ready')
+                          ] } ],
+
+    # Locally, let's wait 10 seconds to make sure the DUT is really asleep
+    # before we proceed.
+    [ "sleep",          { "time":"15" } ],
+
+    # Shut down the second AP and bring the first one back up
+    [ "config",         { "channel":"2412", "mode":"11g",
+                          "ssid": 'SuspendRoam_t1'} ],
+
+    # Wait for the DUT to wake up and return the results of wait_suspend
+    [ "wait_service_suspend_end",   { } ],
+
+    [ "client_ping",    { "count":"10" } ],
+
+    [ "destroy" ],
+  ],
+}