[toranj] add test for ML prefix change during attach (#3844)

tests/toranj/start.sh

@@ -135,6 +135,7 @@ run test-029-data-poll-interval.py
 run test-030-slaac-address-ncp.py
 run test-031-meshcop-joiner-commissioner.py
 run test-032-child-attach-with-multiple-ip-addresses.py
+run test-033-mesh-local-prefix-change.py
 run test-100-mcu-power-state.py
 run test-600-channel-manager-properties.py
 run test-601-channel-manager-channel-change.py

tests/toranj/test-033-mesh-local-prefix-change.py

@@ -0,0 +1,90 @@
+#!/usr/bin/env python
+#
+#  Copyright (c) 2019, The OpenThread Authors.
+#  All rights reserved.
+#
+#  Redistribution and use in source and binary forms, with or without
+#  modification, are permitted provided that the following conditions are met:
+#  1. Redistributions of source code must retain the above copyright
+#     notice, this list of conditions and the following disclaimer.
+#  2. Redistributions in binary form must reproduce the above copyright
+#     notice, this list of conditions and the following disclaimer in the
+#     documentation and/or other materials provided with the distribution.
+#  3. Neither the name of the copyright holder nor the
+#     names of its contributors may be used to endorse or promote products
+#     derived from this software without specific prior written permission.
+#
+#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+#  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+#  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+#  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+#  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+#  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+#  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+#  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+#  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+#  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+#  POSSIBILITY OF SUCH DAMAGE.
+
+import time
+import wpan
+from wpan import verify
+
+#-----------------------------------------------------------------------------------------------------------------------
+# Test description:
+#
+# This test covers the situation where a node attached to a parent with a different mesh-local prefix. It verifies
+# that the attaching node adopts the parent's mesh-local prefix and the RLOC addresses on the node are correctly
+# filtered (by wpantund).
+
+test_name = __file__[:-3] if __file__.endswith('.py') else __file__
+print '-' * 120
+print 'Starting \'{}\''.format(test_name)
+
+#-----------------------------------------------------------------------------------------------------------------------
+# Creating `wpan.Nodes` instances
+
+speedup = 4
+wpan.Node.set_time_speedup_factor(speedup)
+
+node1 = wpan.Node()
+node2 = wpan.Node()
+
+#-----------------------------------------------------------------------------------------------------------------------
+# Init all nodes
+
+wpan.Node.init_all_nodes()
+
+#-----------------------------------------------------------------------------------------------------------------------
+# Test implementation
+
+NET_NAME = 'ml-change'
+CHANNEL = 11
+PANID = '0x1977'
+XPANID = '1020031510006016'
+KEY = '0123456789abcdeffecdba9876543210'
+
+ML_PREFIX_1 = 'fd00:1::'
+ML_PREFIX_2 = 'fd00:2::'
+
+# Form a network on node1
+node1.form(NET_NAME, channel=CHANNEL, panid=PANID, xpanid=XPANID, key=KEY, mesh_local_prefix = ML_PREFIX_1)
+
+# On node2, form a network with same parameters but a different mesh-local prefix
+node2.form(NET_NAME, channel=CHANNEL, panid=PANID, xpanid=XPANID, key=KEY, mesh_local_prefix = ML_PREFIX_2)
+
+# Node 2 is expected to attach to node1 and adopt the mesh-local prefix from node1
+
+verify(node2.is_associated())
+verify(node2.get(wpan.WPAN_IP6_MESH_LOCAL_PREFIX) == node1.get(wpan.WPAN_IP6_MESH_LOCAL_PREFIX))
+
+# Ensure that there are only two addresses on the node2 (link-local and mesh-local address) and that RLOC
+# address is correctly filtered (by wpantund).
+verify(len(wpan.parse_list(node2.get(wpan.WPAN_IP6_ALL_ADDRESSES))) == 2)
+
+#-----------------------------------------------------------------------------------------------------------------------
+# Test finished
+
+wpan.Node.finalize_all_nodes()
+
+print '\'{}\' passed.'.format(test_name)