Disable lowmem flushing in test that needs determinism

Author: luke-jr

src/test/validation_chainstate_tests.cpp

@@ -3,6 +3,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 //
 #include <chainparams.h>
+#include <common/system.h>
 #include <consensus/validation.h>
 #include <random.h>
 #include <rpc/blockchain.h>
@@ -24,6 +25,8 @@ BOOST_FIXTURE_TEST_SUITE(validation_chainstate_tests, ChainTestingSetup)
 //!
 BOOST_AUTO_TEST_CASE(validation_chainstate_resize_caches)
 {
+    g_low_memory_threshold = 0;  // disable to get deterministic flushing
+
     ChainstateManager& manager = *Assert(m_node.chainman);
     CTxMemPool& mempool = *Assert(m_node.mempool);
     Chainstate& c1 = WITH_LOCK(cs_main, return manager.InitializeChainstate(&mempool));

src/wallet/test/wallet_tests.cpp

@@ -10,6 +10,7 @@
 #include <vector>
 
 #include <addresstype.h>
+#include <common/system.h>
 #include <interfaces/chain.h>
 #include <key_io.h>
 #include <node/blockstorage.h>
@@ -783,6 +784,9 @@ BOOST_FIXTURE_TEST_CASE(wallet_descriptor_test, BasicTestingSetup)
 //! rescanning where new transactions in new blocks could be lost.
 BOOST_FIXTURE_TEST_CASE(CreateWallet, TestChain100Setup)
 {
+    // FIXME: this test fails for some reason if there's a flush
+    g_low_memory_threshold = 0;
+
     m_args.ForceSetArg("-unsafesqlitesync", "1");
     // Create new wallet with known key and unload it.
     WalletContext context;