diff --git a/src/bench/bench.cpp b/src/bench/bench.cpp
index cc159eb191f9c..745fd0966d6a6 100644
--- a/src/bench/bench.cpp
+++ b/src/bench/bench.cpp
@@ -15,6 +15,8 @@
 #include <numeric>
 #include <regex>
 
+const RegTestingSetup* g_testing_setup = nullptr;
+
 void benchmark::ConsolePrinter::header()
 {
     std::cout << "# Benchmark, evals, iterations, total, min, max, median" << std::endl;
@@ -113,6 +115,8 @@ void benchmark::BenchRunner::RunAll(Printer& printer, uint64_t num_evals, double
 
     for (const auto& p : benchmarks()) {
         RegTestingSetup test{};
+        assert(g_testing_setup == nullptr);
+        g_testing_setup = &test;
         {
             LOCK(cs_main);
             assert(::ChainActive().Height() == 0);
@@ -133,6 +137,7 @@ void benchmark::BenchRunner::RunAll(Printer& printer, uint64_t num_evals, double
             p.second.func(state);
         }
         printer.result(state);
+        g_testing_setup = nullptr;
     }
 
     printer.footer();
diff --git a/src/bench/bench.h b/src/bench/bench.h
index 3a8c487b9a2f9..022c020e15fc1 100644
--- a/src/bench/bench.h
+++ b/src/bench/bench.h
@@ -14,6 +14,9 @@
 #include <boost/preprocessor/cat.hpp>
 #include <boost/preprocessor/stringize.hpp>
 
+struct RegTestingSetup;
+extern const RegTestingSetup* g_testing_setup; //!< A pointer to the current testing setup
+
 // Simple micro-benchmarking framework; API mostly matches a subset of the Google Benchmark
 // framework (see https://github.com/google/benchmark)
 // Why not use the Google Benchmark framework? Because adding Yet Another Dependency
diff --git a/src/bench/block_assemble.cpp b/src/bench/block_assemble.cpp
index 184367e1e5d7b..a113a73828958 100644
--- a/src/bench/block_assemble.cpp
+++ b/src/bench/block_assemble.cpp
@@ -6,6 +6,7 @@
 #include <consensus/validation.h>
 #include <crypto/sha256.h>
 #include <test/util/mining.h>
+#include <test/util/setup_common.h>
 #include <test/util/wallet.h>
 #include <txmempool.h>
 #include <validation.h>
@@ -29,7 +30,7 @@ static void AssembleBlock(benchmark::State& state)
     std::array<CTransactionRef, NUM_BLOCKS - COINBASE_MATURITY + 1> txs;
     for (size_t b{0}; b < NUM_BLOCKS; ++b) {
         CMutableTransaction tx;
-        tx.vin.push_back(MineBlock(SCRIPT_PUB));
+        tx.vin.push_back(MineBlock(g_testing_setup->m_node, SCRIPT_PUB));
         tx.vin.back().scriptWitness = witness;
         tx.vout.emplace_back(1337, SCRIPT_PUB);
         if (NUM_BLOCKS - b >= COINBASE_MATURITY)
@@ -46,7 +47,7 @@ static void AssembleBlock(benchmark::State& state)
     }
 
     while (state.KeepRunning()) {
-        PrepareBlock(SCRIPT_PUB);
+        PrepareBlock(g_testing_setup->m_node, SCRIPT_PUB);
     }
 }
 
diff --git a/src/bench/wallet_balance.cpp b/src/bench/wallet_balance.cpp
index f39dcc0b71b42..da94afd62b82c 100644
--- a/src/bench/wallet_balance.cpp
+++ b/src/bench/wallet_balance.cpp
@@ -7,6 +7,7 @@
 #include <node/context.h>
 #include <optional.h>
 #include <test/util/mining.h>
+#include <test/util/setup_common.h>
 #include <test/util/wallet.h>
 #include <validationinterface.h>
 #include <wallet/wallet.h>
@@ -29,8 +30,8 @@ static void WalletBalance(benchmark::State& state, const bool set_dirty, const b
     if (add_watchonly) importaddress(wallet, ADDRESS_WATCHONLY);
 
     for (int i = 0; i < 100; ++i) {
-        generatetoaddress(address_mine.get_value_or(ADDRESS_WATCHONLY));
-        generatetoaddress(ADDRESS_WATCHONLY);
+        generatetoaddress(g_testing_setup->m_node, address_mine.get_value_or(ADDRESS_WATCHONLY));
+        generatetoaddress(g_testing_setup->m_node, ADDRESS_WATCHONLY);
     }
     SyncWithValidationInterfaceQueue();
 
diff --git a/src/miner.cpp b/src/miner.cpp
index 2f6feb9e02936..6f4e10b6ed6bc 100644
--- a/src/miner.cpp
+++ b/src/miner.cpp
@@ -45,7 +45,9 @@ BlockAssembler::Options::Options() {
     nBlockMaxWeight = DEFAULT_BLOCK_MAX_WEIGHT;
 }
 
-BlockAssembler::BlockAssembler(const CChainParams& params, const Options& options) : chainparams(params)
+BlockAssembler::BlockAssembler(const CTxMemPool& mempool, const CChainParams& params, const Options& options)
+    : chainparams(params),
+      m_mempool(mempool)
 {
     blockMinFeeRate = options.blockMinFeeRate;
     // Limit weight to between 4K and MAX_BLOCK_WEIGHT-4K for sanity:
@@ -67,7 +69,8 @@ static BlockAssembler::Options DefaultOptions()
     return options;
 }
 
-BlockAssembler::BlockAssembler(const CChainParams& params) : BlockAssembler(params, DefaultOptions()) {}
+BlockAssembler::BlockAssembler(const CTxMemPool& mempool, const CChainParams& params)
+    : BlockAssembler(mempool, params, DefaultOptions()) {}
 
 void BlockAssembler::resetBlock()
 {
@@ -103,7 +106,7 @@ std::unique_ptr<CBlockTemplate> BlockAssembler::CreateNewBlock(const CScript& sc
     pblocktemplate->vTxFees.push_back(-1); // updated at end
     pblocktemplate->vTxSigOpsCost.push_back(-1); // updated at end
 
-    LOCK2(cs_main, mempool.cs);
+    LOCK2(cs_main, m_mempool.cs);
     CBlockIndex* pindexPrev = ::ChainActive().Tip();
     assert(pindexPrev != nullptr);
     nHeight = pindexPrev->nHeight + 1;
@@ -236,7 +239,7 @@ int BlockAssembler::UpdatePackagesForAdded(const CTxMemPool::setEntries& already
     int nDescendantsUpdated = 0;
     for (CTxMemPool::txiter it : alreadyAdded) {
         CTxMemPool::setEntries descendants;
-        mempool.CalculateDescendants(it, descendants);
+        m_mempool.CalculateDescendants(it, descendants);
         // Insert all descendants (not yet in block) into the modified set
         for (CTxMemPool::txiter desc : descendants) {
             if (alreadyAdded.count(desc))
@@ -268,7 +271,7 @@ int BlockAssembler::UpdatePackagesForAdded(const CTxMemPool::setEntries& already
 // cached size/sigops/fee values that are not actually correct.
 bool BlockAssembler::SkipMapTxEntry(CTxMemPool::txiter it, indexed_modified_transaction_set &mapModifiedTx, CTxMemPool::setEntries &failedTx)
 {
-    assert (it != mempool.mapTx.end());
+    assert(it != m_mempool.mapTx.end());
     return mapModifiedTx.count(it) || inBlock.count(it) || failedTx.count(it);
 }
 
@@ -305,7 +308,7 @@ void BlockAssembler::addPackageTxs(int &nPackagesSelected, int &nDescendantsUpda
     // and modifying them for their already included ancestors
     UpdatePackagesForAdded(inBlock, mapModifiedTx);
 
-    CTxMemPool::indexed_transaction_set::index<ancestor_score>::type::iterator mi = mempool.mapTx.get<ancestor_score>().begin();
+    CTxMemPool::indexed_transaction_set::index<ancestor_score>::type::iterator mi = m_mempool.mapTx.get<ancestor_score>().begin();
     CTxMemPool::txiter iter;
 
     // Limit the number of attempts to add transactions to the block when it is
@@ -314,11 +317,10 @@ void BlockAssembler::addPackageTxs(int &nPackagesSelected, int &nDescendantsUpda
     const int64_t MAX_CONSECUTIVE_FAILURES = 1000;
     int64_t nConsecutiveFailed = 0;
 
-    while (mi != mempool.mapTx.get<ancestor_score>().end() || !mapModifiedTx.empty())
-    {
+    while (mi != m_mempool.mapTx.get<ancestor_score>().end() || !mapModifiedTx.empty()) {
         // First try to find a new transaction in mapTx to evaluate.
-        if (mi != mempool.mapTx.get<ancestor_score>().end() &&
-                SkipMapTxEntry(mempool.mapTx.project<0>(mi), mapModifiedTx, failedTx)) {
+        if (mi != m_mempool.mapTx.get<ancestor_score>().end() &&
+            SkipMapTxEntry(m_mempool.mapTx.project<0>(mi), mapModifiedTx, failedTx)) {
             ++mi;
             continue;
         }
@@ -328,13 +330,13 @@ void BlockAssembler::addPackageTxs(int &nPackagesSelected, int &nDescendantsUpda
         bool fUsingModified = false;
 
         modtxscoreiter modit = mapModifiedTx.get<ancestor_score>().begin();
-        if (mi == mempool.mapTx.get<ancestor_score>().end()) {
+        if (mi == m_mempool.mapTx.get<ancestor_score>().end()) {
             // We're out of entries in mapTx; use the entry from mapModifiedTx
             iter = modit->iter;
             fUsingModified = true;
         } else {
             // Try to compare the mapTx entry to the mapModifiedTx entry
-            iter = mempool.mapTx.project<0>(mi);
+            iter = m_mempool.mapTx.project<0>(mi);
             if (modit != mapModifiedTx.get<ancestor_score>().end() &&
                     CompareTxMemPoolEntryByAncestorFee()(*modit, CTxMemPoolModifiedEntry(iter))) {
                 // The best entry in mapModifiedTx has higher score
@@ -389,7 +391,7 @@ void BlockAssembler::addPackageTxs(int &nPackagesSelected, int &nDescendantsUpda
         CTxMemPool::setEntries ancestors;
         uint64_t nNoLimit = std::numeric_limits<uint64_t>::max();
         std::string dummy;
-        mempool.CalculateMemPoolAncestors(*iter, ancestors, nNoLimit, nNoLimit, nNoLimit, nNoLimit, dummy, false);
+        m_mempool.CalculateMemPoolAncestors(*iter, ancestors, nNoLimit, nNoLimit, nNoLimit, nNoLimit, dummy, false);
 
         onlyUnconfirmed(ancestors);
         ancestors.insert(iter);
diff --git a/src/miner.h b/src/miner.h
index 7c4c455072ed6..cc8fc31a9fc66 100644
--- a/src/miner.h
+++ b/src/miner.h
@@ -147,6 +147,7 @@ class BlockAssembler
     int nHeight;
     int64_t nLockTimeCutoff;
     const CChainParams& chainparams;
+    const CTxMemPool& m_mempool;
 
 public:
     struct Options {
@@ -155,8 +156,8 @@ class BlockAssembler
         CFeeRate blockMinFeeRate;
     };
 
-    explicit BlockAssembler(const CChainParams& params);
-    BlockAssembler(const CChainParams& params, const Options& options);
+    explicit BlockAssembler(const CTxMemPool& mempool, const CChainParams& params);
+    explicit BlockAssembler(const CTxMemPool& mempool, const CChainParams& params, const Options& options);
 
     /** Construct a new block template with coinbase to scriptPubKeyIn */
     std::unique_ptr<CBlockTemplate> CreateNewBlock(const CScript& scriptPubKeyIn);
@@ -175,7 +176,7 @@ class BlockAssembler
     /** Add transactions based on feerate including unconfirmed ancestors
       * Increments nPackagesSelected / nDescendantsUpdated with corresponding
       * statistics from the package selection (for logging statistics). */
-    void addPackageTxs(int &nPackagesSelected, int &nDescendantsUpdated) EXCLUSIVE_LOCKS_REQUIRED(mempool.cs);
+    void addPackageTxs(int& nPackagesSelected, int& nDescendantsUpdated) EXCLUSIVE_LOCKS_REQUIRED(m_mempool.cs);
 
     // helper functions for addPackageTxs()
     /** Remove confirmed (inBlock) entries from given set */
@@ -189,13 +190,13 @@ class BlockAssembler
     bool TestPackageTransactions(const CTxMemPool::setEntries& package);
     /** Return true if given transaction from mapTx has already been evaluated,
       * or if the transaction's cached data in mapTx is incorrect. */
-    bool SkipMapTxEntry(CTxMemPool::txiter it, indexed_modified_transaction_set &mapModifiedTx, CTxMemPool::setEntries &failedTx) EXCLUSIVE_LOCKS_REQUIRED(mempool.cs);
+    bool SkipMapTxEntry(CTxMemPool::txiter it, indexed_modified_transaction_set& mapModifiedTx, CTxMemPool::setEntries& failedTx) EXCLUSIVE_LOCKS_REQUIRED(m_mempool.cs);
     /** Sort the package in an order that is valid to appear in a block */
     void SortForBlock(const CTxMemPool::setEntries& package, std::vector<CTxMemPool::txiter>& sortedEntries);
     /** Add descendants of given transactions to mapModifiedTx with ancestor
       * state updated assuming given transactions are inBlock. Returns number
       * of updated descendants. */
-    int UpdatePackagesForAdded(const CTxMemPool::setEntries& alreadyAdded, indexed_modified_transaction_set &mapModifiedTx) EXCLUSIVE_LOCKS_REQUIRED(mempool.cs);
+    int UpdatePackagesForAdded(const CTxMemPool::setEntries& alreadyAdded, indexed_modified_transaction_set& mapModifiedTx) EXCLUSIVE_LOCKS_REQUIRED(m_mempool.cs);
 };
 
 /** Modify the extranonce in a block */
diff --git a/src/rpc/mining.cpp b/src/rpc/mining.cpp
index 9f7f7837d3d31..ea7dcf79c219a 100644
--- a/src/rpc/mining.cpp
+++ b/src/rpc/mining.cpp
@@ -102,7 +102,7 @@ static UniValue getnetworkhashps(const JSONRPCRequest& request)
     return GetNetworkHashPS(!request.params[0].isNull() ? request.params[0].get_int() : 120, !request.params[1].isNull() ? request.params[1].get_int() : -1);
 }
 
-static UniValue generateBlocks(const CScript& coinbase_script, int nGenerate, uint64_t nMaxTries)
+static UniValue generateBlocks(const CTxMemPool& mempool, const CScript& coinbase_script, int nGenerate, uint64_t nMaxTries)
 {
     int nHeightEnd = 0;
     int nHeight = 0;
@@ -116,7 +116,7 @@ static UniValue generateBlocks(const CScript& coinbase_script, int nGenerate, ui
     UniValue blockHashes(UniValue::VARR);
     while (nHeight < nHeightEnd && !ShutdownRequested())
     {
-        std::unique_ptr<CBlockTemplate> pblocktemplate(BlockAssembler(Params()).CreateNewBlock(coinbase_script));
+        std::unique_ptr<CBlockTemplate> pblocktemplate(BlockAssembler(mempool, Params()).CreateNewBlock(coinbase_script));
         if (!pblocktemplate.get())
             throw JSONRPCError(RPC_INTERNAL_ERROR, "Couldn't create new block");
         CBlock *pblock = &pblocktemplate->block;
@@ -179,9 +179,11 @@ static UniValue generatetodescriptor(const JSONRPCRequest& request)
         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, strprintf("Cannot derive script without private keys"));
     }
 
+    const CTxMemPool& mempool = EnsureMemPool();
+
     CHECK_NONFATAL(coinbase_script.size() == 1);
 
-    return generateBlocks(coinbase_script.at(0), num_blocks, max_tries);
+    return generateBlocks(mempool, coinbase_script.at(0), num_blocks, max_tries);
 }
 
 static UniValue generatetoaddress(const JSONRPCRequest& request)
@@ -215,9 +217,11 @@ static UniValue generatetoaddress(const JSONRPCRequest& request)
         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Error: Invalid address");
     }
 
+    const CTxMemPool& mempool = EnsureMemPool();
+
     CScript coinbase_script = GetScriptForDestination(destination);
 
-    return generateBlocks(coinbase_script, nGenerate, nMaxTries);
+    return generateBlocks(mempool, coinbase_script, nGenerate, nMaxTries);
 }
 
 static UniValue getmininginfo(const JSONRPCRequest& request)
@@ -548,7 +552,7 @@ static UniValue getblocktemplate(const JSONRPCRequest& request)
 
         // Create new block
         CScript scriptDummy = CScript() << OP_TRUE;
-        pblocktemplate = BlockAssembler(Params()).CreateNewBlock(scriptDummy);
+        pblocktemplate = BlockAssembler(mempool, Params()).CreateNewBlock(scriptDummy);
         if (!pblocktemplate)
             throw JSONRPCError(RPC_OUT_OF_MEMORY, "Out of memory");
 
diff --git a/src/test/blockfilter_index_tests.cpp b/src/test/blockfilter_index_tests.cpp
index 2b616f4c2ba7e..79e18cd2c0487 100644
--- a/src/test/blockfilter_index_tests.cpp
+++ b/src/test/blockfilter_index_tests.cpp
@@ -18,6 +18,11 @@
 
 BOOST_AUTO_TEST_SUITE(blockfilter_index_tests)
 
+struct BuildChainTestingSetup : public TestChain100Setup {
+    CBlock CreateBlock(const CBlockIndex* prev, const std::vector<CMutableTransaction>& txns, const CScript& scriptPubKey);
+    bool BuildChain(const CBlockIndex* pindex, const CScript& coinbase_script_pub_key, size_t length, std::vector<std::shared_ptr<CBlock>>& chain);
+};
+
 static bool CheckFilterLookups(BlockFilterIndex& filter_index, const CBlockIndex* block_index,
                                uint256& last_header)
 {
@@ -52,12 +57,12 @@ static bool CheckFilterLookups(BlockFilterIndex& filter_index, const CBlockIndex
     return true;
 }
 
-static CBlock CreateBlock(const CBlockIndex* prev,
-                          const std::vector<CMutableTransaction>& txns,
-                          const CScript& scriptPubKey)
+CBlock BuildChainTestingSetup::CreateBlock(const CBlockIndex* prev,
+    const std::vector<CMutableTransaction>& txns,
+    const CScript& scriptPubKey)
 {
     const CChainParams& chainparams = Params();
-    std::unique_ptr<CBlockTemplate> pblocktemplate = BlockAssembler(chainparams).CreateNewBlock(scriptPubKey);
+    std::unique_ptr<CBlockTemplate> pblocktemplate = BlockAssembler(*m_node.mempool, chainparams).CreateNewBlock(scriptPubKey);
     CBlock& block = pblocktemplate->block;
     block.hashPrevBlock = prev->GetBlockHash();
     block.nTime = prev->nTime + 1;
@@ -76,8 +81,10 @@ static CBlock CreateBlock(const CBlockIndex* prev,
     return block;
 }
 
-static bool BuildChain(const CBlockIndex* pindex, const CScript& coinbase_script_pub_key,
-                       size_t length, std::vector<std::shared_ptr<CBlock>>& chain)
+bool BuildChainTestingSetup::BuildChain(const CBlockIndex* pindex,
+    const CScript& coinbase_script_pub_key,
+    size_t length,
+    std::vector<std::shared_ptr<CBlock>>& chain)
 {
     std::vector<CMutableTransaction> no_txns;
 
@@ -95,7 +102,7 @@ static bool BuildChain(const CBlockIndex* pindex, const CScript& coinbase_script
     return true;
 }
 
-BOOST_FIXTURE_TEST_CASE(blockfilter_index_initial_sync, TestChain100Setup)
+BOOST_FIXTURE_TEST_CASE(blockfilter_index_initial_sync, BuildChainTestingSetup)
 {
     BlockFilterIndex filter_index(BlockFilterType::BASIC, 1 << 20, true);
 
diff --git a/src/test/miner_tests.cpp b/src/test/miner_tests.cpp
index 2b08e6a36c8cd..9f3ca87206923 100644
--- a/src/test/miner_tests.cpp
+++ b/src/test/miner_tests.cpp
@@ -30,6 +30,7 @@ struct MinerTestingSetup : public TestingSetup {
     {
         return CheckSequenceLocks(*m_node.mempool, tx, flags);
     }
+    BlockAssembler AssemblerForTest(const CChainParams& params);
 };
 } // namespace miner_tests
 
@@ -48,12 +49,13 @@ class HasReason {
 
 static CFeeRate blockMinFeeRate = CFeeRate(DEFAULT_BLOCK_MIN_TX_FEE);
 
-static BlockAssembler AssemblerForTest(const CChainParams& params) {
+BlockAssembler MinerTestingSetup::AssemblerForTest(const CChainParams& params)
+{
     BlockAssembler::Options options;
 
     options.nBlockMaxWeight = MAX_BLOCK_WEIGHT;
     options.blockMinFeeRate = blockMinFeeRate;
-    return BlockAssembler(params, options);
+    return BlockAssembler(*m_node.mempool, params, options);
 }
 
 constexpr static struct {
diff --git a/src/test/util/mining.cpp b/src/test/util/mining.cpp
index 30f0f5d7e6fe6..1df6844062c70 100644
--- a/src/test/util/mining.cpp
+++ b/src/test/util/mining.cpp
@@ -8,22 +8,23 @@
 #include <consensus/merkle.h>
 #include <key_io.h>
 #include <miner.h>
+#include <node/context.h>
 #include <pow.h>
 #include <script/standard.h>
 #include <validation.h>
 
-CTxIn generatetoaddress(const std::string& address)
+CTxIn generatetoaddress(const NodeContext& node, const std::string& address)
 {
     const auto dest = DecodeDestination(address);
     assert(IsValidDestination(dest));
     const auto coinbase_script = GetScriptForDestination(dest);
 
-    return MineBlock(coinbase_script);
+    return MineBlock(node, coinbase_script);
 }
 
-CTxIn MineBlock(const CScript& coinbase_scriptPubKey)
+CTxIn MineBlock(const NodeContext& node, const CScript& coinbase_scriptPubKey)
 {
-    auto block = PrepareBlock(coinbase_scriptPubKey);
+    auto block = PrepareBlock(node, coinbase_scriptPubKey);
 
     while (!CheckProofOfWork(block->GetHash(), block->nBits, Params().GetConsensus())) {
         ++block->nNonce;
@@ -36,10 +37,11 @@ CTxIn MineBlock(const CScript& coinbase_scriptPubKey)
     return CTxIn{block->vtx[0]->GetHash(), 0};
 }
 
-std::shared_ptr<CBlock> PrepareBlock(const CScript& coinbase_scriptPubKey)
+std::shared_ptr<CBlock> PrepareBlock(const NodeContext& node, const CScript& coinbase_scriptPubKey)
 {
+    assert(node.mempool);
     auto block = std::make_shared<CBlock>(
-        BlockAssembler{Params()}
+        BlockAssembler{*node.mempool, Params()}
             .CreateNewBlock(coinbase_scriptPubKey)
             ->block);
 
diff --git a/src/test/util/mining.h b/src/test/util/mining.h
index afe4de684f1bb..5f250fffe8334 100644
--- a/src/test/util/mining.h
+++ b/src/test/util/mining.h
@@ -11,14 +11,15 @@
 class CBlock;
 class CScript;
 class CTxIn;
+struct NodeContext;
 
 /** Returns the generated coin */
-CTxIn MineBlock(const CScript& coinbase_scriptPubKey);
+CTxIn MineBlock(const NodeContext&, const CScript& coinbase_scriptPubKey);
 
 /** Prepare a block to be mined */
-std::shared_ptr<CBlock> PrepareBlock(const CScript& coinbase_scriptPubKey);
+std::shared_ptr<CBlock> PrepareBlock(const NodeContext&, const CScript& coinbase_scriptPubKey);
 
 /** RPC-like helper function, returns the generated coin */
-CTxIn generatetoaddress(const std::string& address);
+CTxIn generatetoaddress(const NodeContext&, const std::string& address);
 
 #endif // BITCOIN_TEST_UTIL_MINING_H
diff --git a/src/test/util/setup_common.cpp b/src/test/util/setup_common.cpp
index 86c355fdcd1da..3bdf3485faa2c 100644
--- a/src/test/util/setup_common.cpp
+++ b/src/test/util/setup_common.cpp
@@ -175,7 +175,7 @@ TestChain100Setup::TestChain100Setup()
 CBlock TestChain100Setup::CreateAndProcessBlock(const std::vector<CMutableTransaction>& txns, const CScript& scriptPubKey)
 {
     const CChainParams& chainparams = Params();
-    std::unique_ptr<CBlockTemplate> pblocktemplate = BlockAssembler(chainparams).CreateNewBlock(scriptPubKey);
+    std::unique_ptr<CBlockTemplate> pblocktemplate = BlockAssembler(*m_node.mempool, chainparams).CreateNewBlock(scriptPubKey);
     CBlock& block = pblocktemplate->block;
 
     // Replace mempool-selected txns with just coinbase plus passed-in txns:
diff --git a/src/test/validation_block_tests.cpp b/src/test/validation_block_tests.cpp
index 1fa48b325c072..dae389a167f63 100644
--- a/src/test/validation_block_tests.cpp
+++ b/src/test/validation_block_tests.cpp
@@ -20,7 +20,17 @@
 
 static const std::vector<unsigned char> V_OP_TRUE{OP_TRUE};
 
-BOOST_FIXTURE_TEST_SUITE(validation_block_tests, RegTestingSetup)
+namespace validation_block_tests {
+struct MinerTestingSetup : public RegTestingSetup {
+    std::shared_ptr<CBlock> Block(const uint256& prev_hash);
+    std::shared_ptr<const CBlock> GoodBlock(const uint256& prev_hash);
+    std::shared_ptr<const CBlock> BadBlock(const uint256& prev_hash);
+    std::shared_ptr<CBlock> FinalizeBlock(std::shared_ptr<CBlock> pblock);
+    void BuildChain(const uint256& root, int height, const unsigned int invalid_rate, const unsigned int branch_rate, const unsigned int max_size, std::vector<std::shared_ptr<const CBlock>>& blocks);
+};
+} // namespace validation_block_tests
+
+BOOST_FIXTURE_TEST_SUITE(validation_block_tests, MinerTestingSetup)
 
 struct TestSubscriber : public CValidationInterface {
     uint256 m_expected_tip;
@@ -49,7 +59,7 @@ struct TestSubscriber : public CValidationInterface {
     }
 };
 
-std::shared_ptr<CBlock> Block(const uint256& prev_hash)
+std::shared_ptr<CBlock> MinerTestingSetup::Block(const uint256& prev_hash)
 {
     static int i = 0;
     static uint64_t time = Params().GenesisBlock().nTime;
@@ -57,7 +67,7 @@ std::shared_ptr<CBlock> Block(const uint256& prev_hash)
     CScript pubKey;
     pubKey << i++ << OP_TRUE;
 
-    auto ptemplate = BlockAssembler(Params()).CreateNewBlock(pubKey);
+    auto ptemplate = BlockAssembler(*m_node.mempool, Params()).CreateNewBlock(pubKey);
     auto pblock = std::make_shared<CBlock>(ptemplate->block);
     pblock->hashPrevBlock = prev_hash;
     pblock->nTime = ++time;
@@ -83,7 +93,7 @@ std::shared_ptr<CBlock> Block(const uint256& prev_hash)
     return pblock;
 }
 
-std::shared_ptr<CBlock> FinalizeBlock(std::shared_ptr<CBlock> pblock)
+std::shared_ptr<CBlock> MinerTestingSetup::FinalizeBlock(std::shared_ptr<CBlock> pblock)
 {
     LOCK(cs_main); // For LookupBlockIndex
     GenerateCoinbaseCommitment(*pblock, LookupBlockIndex(pblock->hashPrevBlock), Params().GetConsensus());
@@ -98,13 +108,13 @@ std::shared_ptr<CBlock> FinalizeBlock(std::shared_ptr<CBlock> pblock)
 }
 
 // construct a valid block
-std::shared_ptr<const CBlock> GoodBlock(const uint256& prev_hash)
+std::shared_ptr<const CBlock> MinerTestingSetup::GoodBlock(const uint256& prev_hash)
 {
     return FinalizeBlock(Block(prev_hash));
 }
 
 // construct an invalid block (but with a valid header)
-std::shared_ptr<const CBlock> BadBlock(const uint256& prev_hash)
+std::shared_ptr<const CBlock> MinerTestingSetup::BadBlock(const uint256& prev_hash)
 {
     auto pblock = Block(prev_hash);
 
@@ -119,7 +129,7 @@ std::shared_ptr<const CBlock> BadBlock(const uint256& prev_hash)
     return ret;
 }
 
-void BuildChain(const uint256& root, int height, const unsigned int invalid_rate, const unsigned int branch_rate, const unsigned int max_size, std::vector<std::shared_ptr<const CBlock>>& blocks)
+void MinerTestingSetup::BuildChain(const uint256& root, int height, const unsigned int invalid_rate, const unsigned int branch_rate, const unsigned int max_size, std::vector<std::shared_ptr<const CBlock>>& blocks)
 {
     if (height <= 0 || blocks.size() >= max_size) return;