Merge #17362: test: speed up wallet_avoidreuse, add logging

0e7c90e test: speed up wallet_avoidreuse.py (Jon Atack)
6d50b26 test: add logging to wallet_avoidreuse.py (Jon Atack)

Pull request description:

  Inspired by PRs #17340 and #15881.

  - add logging
  - pass -whitelist in `set_test_params` to speed up transaction relay

  `wallet_avoidreuse.py` is not intended to test P2P transaction relay/timing, so it should be fine to do this here. This reduces test run time variability and speeds up the test by 2-3 times on average.

  Test run times in seconds:

  - before: 20, 24, 22, 17, 27, 40, 30

  - after: 10, 10, 8, 9, 10, 7, 8

ACKs for top commit:
  MarcoFalke:
    ACK 0e7c90e 🐊
  fanquake:
    ACK 0e7c90e

Tree-SHA512: 6d954a0aaf402c9594201626b59d29263479059e68fa5155bb44ed973cd0c3347729dd78b78b4d5a2275e45da365dc1afb4cc7e3293dea33fcc2e3e83a39faf5

Author: fanquake

test/functional/wallet_avoidreuse.py

@@ -68,6 +68,9 @@ class AvoidReuseTest(BitcoinTestFramework):
     def set_test_params(self):
         self.setup_clean_chain = False
         self.num_nodes = 2
+        # This test isn't testing txn relay/timing, so set whitelist on the
+        # peers for instant txn relay. This speeds up the test run time 2-3x.
+        self.extra_args = [["-whitelist=127.0.0.1"]] * self.num_nodes
 
     def skip_test_if_missing_module(self):
         self.skip_if_no_wallet()
@@ -87,6 +90,8 @@ def run_test(self):
 
     def test_persistence(self):
         '''Test that wallet files persist the avoid_reuse flag.'''
+        self.log.info("Test wallet files persist avoid_reuse flag")
+
         # Configure node 1 to use avoid_reuse
         self.nodes[1].setwalletflag('avoid_reuse')
 
@@ -109,6 +114,8 @@ def test_persistence(self):
 
     def test_immutable(self):
         '''Test immutable wallet flags'''
+        self.log.info("Test immutable wallet flags")
+
         # Attempt to set the disable_private_keys flag; this should not work
         assert_raises_rpc_error(-8, "Wallet flag is immutable", self.nodes[1].setwalletflag, 'disable_private_keys')
 
@@ -130,6 +137,7 @@ def test_fund_send_fund_senddirty(self):
         the avoid_reuse flag set to false. This means the 10 BTC send should succeed,
         where it fails in test_fund_send_fund_send.
         '''
+        self.log.info("Test fund send fund send dirty")
 
         fundaddr = self.nodes[1].getnewaddress()
         retaddr = self.nodes[0].getnewaddress()
@@ -183,6 +191,7 @@ def test_fund_send_fund_send(self):
         [1] tries to spend 10 BTC (fails; dirty).
         [1] tries to spend 4 BTC (succeeds; change address sufficient)
         '''
+        self.log.info("Test fund send fund send")
 
         fundaddr = self.nodes[1].getnewaddress()
         retaddr = self.nodes[0].getnewaddress()