Merge #15419: qa: Always refresh cache to be out of ibd

fa2cdc9ac2 test: Simplify create_cache (MarcoFalke)
fa25210d62 qa: Fix wallet_txn_doublespend issue (MarcoFalke)
1111aecbb5 qa: Always refresh stale cache to be out of ibd (MarcoFalke)
fab0d85802 qa: Remove mocktime unless required (MarcoFalke)

Pull request description:

  When starting a test, we are always in IBD because the timestamps on cached blocks are in the past. Usually, we solve that by generating a block at the beginning of the test.

  That is clumsy and might even lead to other problems such as #15360 and https://github.com/bitcoin/bitcoin/issues/14446#issuecomment-461926598

  So fix that by getting rid of mocktime and always refreshing the last block of the cache when starting the test framework.

  Should fix #14446

Tree-SHA512: 6af09800f9c86131349a103af617a54551f5f3f3260d38e14e3f30fdd3d91a0feb0100c56cbb12eae4aeac5571ae4b530b16345cbb831d2670237b53351a22c1

1 files changed, 9 insertions, 1 deletions

diff --git a/test/functional/wallet_create_tx.py b/test/functional/wallet_create_tx.py
index 27dc0fb279..7b749235e2 100755
--- a/test/functional/wallet_create_tx.py
+++ b/test/functional/wallet_create_tx.py
@@ -7,17 +7,25 @@ from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     assert_equal,
 )
+from test_framework.blocktools import (
+    TIME_GENESIS_BLOCK,
+)
 
 
 class CreateTxWalletTest(BitcoinTestFramework):
     def set_test_params(self):
-        self.setup_clean_chain = False
+        self.setup_clean_chain = True
         self.num_nodes = 1
 
     def skip_test_if_missing_module(self):
         self.skip_if_no_wallet()
 
     def run_test(self):
+        self.log.info('Create some old blocks')
+        self.nodes[0].setmocktime(TIME_GENESIS_BLOCK)
+        self.nodes[0].generate(200)
+        self.nodes[0].setmocktime(0)
+
         self.log.info('Check that we have some (old) blocks and that anti-fee-sniping is disabled')
         assert_equal(self.nodes[0].getblockchaininfo()['blocks'], 200)
         txid = self.nodes[0].sendtoaddress(self.nodes[0].getnewaddress(), 1)