[toranj] test-case covering attach between single parent/child with poor link (#4114)
diff --git a/tests/toranj/start.sh b/tests/toranj/start.sh
index abc3709..311e1f9 100755
--- a/tests/toranj/start.sh
+++ b/tests/toranj/start.sh
@@ -136,6 +136,7 @@
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-034-poor-link-parent-child-attach.py
run test-100-mcu-power-state.py
run test-600-channel-manager-properties.py
run test-601-channel-manager-channel-change.py
diff --git a/tests/toranj/test-034-poor-link-parent-child-attach.py b/tests/toranj/test-034-poor-link-parent-child-attach.py
new file mode 100644
index 0000000..a10f9ca
--- /dev/null
+++ b/tests/toranj/test-034-poor-link-parent-child-attach.py
@@ -0,0 +1,76 @@
+#!/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 wpan
+
+# -----------------------------------------------------------------------------------------------------------------------
+# Test description:
+#
+# This test covers a situation where a single parent exists in network with poor link quality ensuding the child
+# can attach the parent.
+
+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)
+
+parent = wpan.Node()
+child = wpan.Node()
+
+# -----------------------------------------------------------------------------------------------------------------------
+# Init all nodes
+
+wpan.Node.init_all_nodes()
+
+# -----------------------------------------------------------------------------------------------------------------------
+# Test implementation
+
+parent.form("network")
+
+# Create a poor link between child and parent using MAC fixed RSSI filter
+
+parent.set(wpan.WPAN_MAC_FILTER_FIXED_RSSI, '-99')
+parent.add(wpan.WPAN_MAC_FILTER_ENTRIES, child.get(wpan.WPAN_EXT_ADDRESS)[1:-1])
+
+child.set(wpan.WPAN_MAC_FILTER_FIXED_RSSI, '-99')
+child.add(wpan.WPAN_MAC_FILTER_ENTRIES, parent.get(wpan.WPAN_EXT_ADDRESS)[1:-1])
+
+# Ensure child can still attach the single low-link quality parent
+child.join_node(parent, node_type=wpan.JOIN_TYPE_END_DEVICE)
+
+# -----------------------------------------------------------------------------------------------------------------------
+# Test finished
+
+wpan.Node.finalize_all_nodes()
+
+print('\'{}\' passed.'.format(test_name))
diff --git a/tests/toranj/wpan.py b/tests/toranj/wpan.py
index 410d938..b16889a 100644
--- a/tests/toranj/wpan.py
+++ b/tests/toranj/wpan.py
@@ -122,6 +122,10 @@
WPAN_MAC_BLACKLIST_ENTRIES = "MAC:Blacklist:Entries"
WPAN_MAC_BLACKLIST_ENTRIES_ASVALMAP = "MAC:Blacklist:Entries:AsValMap"
+WPAN_MAC_FILTER_FIXED_RSSI = "MAC:Filter:FixedRssi"
+WPAN_MAC_FILTER_ENTRIES = "MAC:Filter:Entries"
+WPAN_MAC_FILTER_ENTRIES_ASVALMAP = "MAC:Filter:Entries:AsValMap"
+
WPAN_CHILD_SUPERVISION_INTERVAL = "ChildSupervision:Interval"
WPAN_CHILD_SUPERVISION_CHECK_TIMEOUT = "ChildSupervision:CheckTimeout"
