fuzz: Initialize a TestingSetup for test_one_input

For fuzz tests that need it.

src/test/fuzz/coins_view.cpp

@@ -27,6 +27,7 @@
 #include <vector>
 
 namespace {
+const TestingSetup* g_setup;
 const Coin EMPTY_COIN{};
 
 bool operator==(const Coin& a, const Coin& b)
@@ -39,6 +40,7 @@ bool operator==(const Coin& a, const Coin& b)
 void initialize_coins_view()
 {
     static const auto testing_setup = MakeNoLogFileContext<const TestingSetup>();
+    g_setup = testing_setup.get();
 }
 
 FUZZ_TARGET_INIT(coins_view, initialize_coins_view)
@@ -268,7 +270,7 @@ FUZZ_TARGET_INIT(coins_view, initialize_coins_view)
                 CCoinsStats stats{CoinStatsHashType::HASH_SERIALIZED};
                 bool expected_code_path = false;
                 try {
-                    (void)GetUTXOStats(&coins_view_cache, WITH_LOCK(::cs_main, return std::ref(g_chainman.m_blockman)), stats);
+                    (void)GetUTXOStats(&coins_view_cache, WITH_LOCK(::cs_main, return std::ref(g_setup->m_node.chainman->m_blockman)), stats);
                 } catch (const std::logic_error&) {
                     expected_code_path = true;
                 }

src/test/fuzz/load_external_block_file.cpp

@@ -13,9 +13,14 @@
 #include <cstdint>
 #include <vector>
 
+namespace {
+const TestingSetup* g_setup;
+} // namespace
+
 void initialize_load_external_block_file()
 {
     static const auto testing_setup = MakeNoLogFileContext<const TestingSetup>();
+    g_setup = testing_setup.get();
 }
 
 FUZZ_TARGET_INIT(load_external_block_file, initialize_load_external_block_file)
@@ -27,5 +32,5 @@ FUZZ_TARGET_INIT(load_external_block_file, initialize_load_external_block_file)
         return;
     }
     FlatFilePos flat_file_pos;
-    ::ChainstateActive().LoadExternalBlockFile(Params(), fuzzed_block_file, fuzzed_data_provider.ConsumeBool() ? &flat_file_pos : nullptr);
+    g_setup->m_node.chainman->ActiveChainstate().LoadExternalBlockFile(Params(), fuzzed_block_file, fuzzed_data_provider.ConsumeBool() ? &flat_file_pos : nullptr);
 }

src/test/fuzz/validation_load_mempool.cpp

@@ -14,9 +14,14 @@
 #include <cstdint>
 #include <vector>
 
+namespace {
+const TestingSetup* g_setup;
+} // namespace
+
 void initialize_validation_load_mempool()
 {
     static const auto testing_setup = MakeNoLogFileContext<const TestingSetup>();
+    g_setup = testing_setup.get();
 }
 
 FUZZ_TARGET_INIT(validation_load_mempool, initialize_validation_load_mempool)
@@ -29,6 +34,6 @@ FUZZ_TARGET_INIT(validation_load_mempool, initialize_validation_load_mempool)
     auto fuzzed_fopen = [&](const fs::path&, const char*) {
         return fuzzed_file_provider.open();
     };
-    (void)LoadMempool(pool, ::ChainstateActive(), fuzzed_fopen);
+    (void)LoadMempool(pool, g_setup->m_node.chainman->ActiveChainstate(), fuzzed_fopen);
     (void)DumpMempool(pool, fuzzed_fopen, true);
 }