[cirque] Fix thread network setup code (#6156)

src/test_driver/linux-cirque/helper/CHIPTestBase.py

@@ -129,9 +129,16 @@ def sequenceMatch(self, string, patterns):
         return True
 
     def connect_to_thread_network(self):
-        self.logger.info("Running commands to form Thread network")
+        '''
+        The dataset in this function is used to replace the default dataset generated by openthread.
+        When the test writer is calling this function to setup a thread network, it means they just
+        want a working IPv6 network or a working thread network and don't care about the detail of
+        this network.
+        '''
+        self.logger.info("Running commands to form default Thread network")
         for device in self.non_ap_devices:
             self.wait_for_device_output(device['id'], "Border router agent started.", 5)
+
         otInitCommands = [
             "ot-ctl thread stop",
             "ot-ctl ifconfig down",
@@ -147,13 +154,13 @@ def connect_to_thread_network(self):
         self.logger.info("Waiting for Thread network to be formed...")
         threadNetworkFormed = False
         for i in range(30):
-            roles = set()
+            roles = list()
             for device in self.non_ap_devices:
                 # We can only check the status of ot-agent by query its state.
                 reply = self.execute_device_cmd(device['id'], 'ot-ctl state')
-                roles.add(reply['output'].split()[0])
-            if ('leader' in roles) and ('router' in roles or 'child' in roles):
-                threadNetworkFormed = True
+                roles.append(reply['output'].split()[0])
+            threadNetworkFormed = (roles.count('leader') == 1) and (roles.count('leader') + roles.count('router') + roles.count('child') == len(self.non_ap_devices))
+            if threadNetworkFormed:
                 break
             time.sleep(1)
         self.assertTrue(threadNetworkFormed)