[[refactor]] Check CTxMemPool options in constructor

This ensures that the tests run the same checks on the mempool options
that the init code also applies.

src/test/miner_tests.cpp

@@ -14,8 +14,10 @@
 #include <test/util/txmempool.h>
 #include <txmempool.h>
 #include <uint256.h>
+#include <util/check.h>
 #include <util/strencodings.h>
 #include <util/time.h>
+#include <util/translation.h>
 #include <validation.h>
 #include <versionbits.h>
 
@@ -46,7 +48,9 @@ struct MinerTestingSetup : public TestingSetup {
         // pointer is not accessed, when the new one should be accessed
         // instead.
         m_node.mempool.reset();
-        m_node.mempool = std::make_unique<CTxMemPool>(MemPoolOptionsForTest(m_node));
+        bilingual_str error;
+        m_node.mempool = std::make_unique<CTxMemPool>(MemPoolOptionsForTest(m_node), error);
+        Assert(error.empty());
         return *m_node.mempool;
     }
     BlockAssembler AssemblerForTest(CTxMemPool& tx_mempool);