Merge #11310: [tests] Test listwallets RPC

fb1f32582 Add listwallets RPC test to multiwallet.py (Cristian Mircea Messel)

Pull request description:

Tree-SHA512: acf3377ac86fcc4e7fe36e3b97120f3e51b7bd94cb7136ce22e7e2043ce8ec5555c246c41f8501272aeb1e56ad16d05eb8c4eeb6acf3315a218c1ed4e5844871

test/functional/multiwallet.py

@@ -18,6 +18,8 @@ class MultiWalletTest(BitcoinTestFramework):
         self.extra_args = [['-wallet=w1', '-wallet=w2', '-wallet=w3']]
 
     def run_test(self):
+        assert_equal(set(self.nodes[0].listwallets()), {"w1", "w2", "w3"})
+
         self.stop_node(0)
 
         # should not initialize if there are duplicate wallets