test: don't throw from the destructor of DebugLogHelper

Throwing an exception from the destructor of a class is a bad practice,
avoid that and instead print the message to the standard error output
and call `std::abort()`.

src/test/util/logging.cpp

@@ -8,7 +8,8 @@
 #include <noui.h>
 #include <tinyformat.h>
 
-#include <stdexcept>
+#include <cstdlib>
+#include <iostream>
 
 DebugLogHelper::DebugLogHelper(std::string message, MatchFn match)
     : m_message{std::move(message)}, m_match(std::move(match))
@@ -21,11 +22,12 @@ DebugLogHelper::DebugLogHelper(std::string message, MatchFn match)
     noui_test_redirect();
 }
 
-void DebugLogHelper::check_found()
+DebugLogHelper::~DebugLogHelper()
 {
     noui_reconnect();
     LogInstance().DeleteCallback(m_print_connection);
     if (!m_found && m_match(nullptr)) {
-        throw std::runtime_error(strprintf("'%s' not found in debug log\n", m_message));
+        tfm::format(std::cerr, "Fatal error: expected message not found in the debug log: '%s'\n", m_message);
+        std::abort();
     }
 }

src/test/util/logging.h

@@ -13,10 +13,7 @@
 
 class DebugLogHelper
 {
-    const std::string m_message;
-    bool m_found{false};
-    std::list<std::function<void(const std::string&)>>::iterator m_print_connection;
-
+public:
     //! Custom match checking function.
     //!
     //! Invoked with pointers to lines containing matching strings, and with
@@ -27,13 +24,16 @@ class DebugLogHelper
     //! (2) raising an error in check_found if no match was found
     //! Can return false to do the opposite in either case.
     using MatchFn = std::function<bool(const std::string* line)>;
-    MatchFn m_match;
 
-    void check_found();
-
-public:
     explicit DebugLogHelper(std::string message, MatchFn match = [](const std::string*){ return true; });
-    ~DebugLogHelper() noexcept(false) { check_found(); }
+
+    ~DebugLogHelper();
+
+private:
+    const std::string m_message;
+    bool m_found{false};
+    std::list<std::function<void(const std::string&)>>::iterator m_print_connection;
+    MatchFn m_match;
 };
 
 #define ASSERT_DEBUG_LOG(message) DebugLogHelper UNIQUE_NAME(debugloghelper)(message)