[QA] Fix random failure in wallet_abandonconflict.py

test/functional/wallet_abandonconflict.py

@@ -88,11 +88,12 @@ def run_test(self):
 
         # Restart the node with a higher min relay fee so the parent tx is no longer in mempool
         # TODO: redo with eviction
-        self.stop_node(0)
-        self.start_node(0, extra_args=["-minrelaytxfee=0.0001"])
+        self.restart_node(0, extra_args=["-minrelaytxfee=0.0001"])
+        assert self.nodes[0].getmempoolinfo()['loaded']
 
-        # Verify txs no longer in mempool
+        # Verify txs no longer in either node's mempool
         assert_equal(len(self.nodes[0].getrawmempool()), 0)
+        assert_equal(len(self.nodes[1].getrawmempool()), 0)
 
         # Not in mempool txs from self should only reduce balance
         # inputs are still spent, but change not received