validation tests: Use existing {Chainstate,Block}Man

Use {Chain,}TestingSetup's existing {Chainstate,Block}Manager and avoid
unnecessarily creating a local one.

This also helps reduce the code diff for a later commit where we change
{Chainstate,Block}Manager's constructor signature.

Author: dongcarl

src/test/validation_chainstate_tests.cpp

@@ -9,27 +9,20 @@
 #include <sync.h>
 #include <test/util/chainstate.h>
 #include <test/util/setup_common.h>
-#include <timedata.h>
 #include <uint256.h>
 #include <validation.h>
 
 #include <vector>
 
 #include <boost/test/unit_test.hpp>
 
-BOOST_FIXTURE_TEST_SUITE(validation_chainstate_tests, TestingSetup)
+BOOST_FIXTURE_TEST_SUITE(validation_chainstate_tests, ChainTestingSetup)
 
 //! Test resizing coins-related CChainState caches during runtime.
 //!
 BOOST_AUTO_TEST_CASE(validation_chainstate_resize_caches)
 {
-    const ChainstateManager::Options chainman_opts{
-        .chainparams = Params(),
-        .adjusted_time_callback = GetAdjustedTime,
-    };
-    ChainstateManager manager{chainman_opts};
-
-    WITH_LOCK(::cs_main, manager.m_blockman.m_block_tree_db = std::make_unique<CBlockTreeDB>(1 << 20, true));
+    ChainstateManager& manager = *Assert(m_node.chainman);
     CTxMemPool& mempool = *Assert(m_node.mempool);
 
     //! Create and add a Coin with DynamicMemoryUsage of 80 bytes to the given view.

src/test/validation_flush_tests.cpp

@@ -4,14 +4,11 @@
 //
 #include <sync.h>
 #include <test/util/setup_common.h>
-#include <txmempool.h>
 #include <validation.h>
 
 #include <boost/test/unit_test.hpp>
 
-using node::BlockManager;
-
-BOOST_FIXTURE_TEST_SUITE(validation_flush_tests, ChainTestingSetup)
+BOOST_FIXTURE_TEST_SUITE(validation_flush_tests, TestingSetup)
 
 //! Test utilities for detecting when we need to flush the coins cache based
 //! on estimated memory usage.
@@ -20,11 +17,7 @@ BOOST_FIXTURE_TEST_SUITE(validation_flush_tests, ChainTestingSetup)
 //!
 BOOST_AUTO_TEST_CASE(getcoinscachesizestate)
 {
-    CTxMemPool& mempool = *Assert(m_node.mempool);
-    BlockManager blockman{};
-    CChainState chainstate{&mempool, blockman, *Assert(m_node.chainman)};
-    chainstate.InitCoinsDB(/*cache_size_bytes=*/1 << 10, /*in_memory=*/true, /*should_wipe=*/false);
-    WITH_LOCK(::cs_main, chainstate.InitCoinsCache(1 << 10));
+    CChainState& chainstate{m_node.chainman->ActiveChainstate()};
 
     constexpr bool is_64_bit = sizeof(void*) == 8;