gather more information on exceptions that happen when running tests

Signed-off-by: Matthieu Gallien <matthieu.gallien@nextcloud.com>

test/testsyncengine.cpp

@@ -15,6 +15,8 @@
 #include <QFile>
 #include <QtTest>
 
+#include <filesystem>
+
 using namespace OCC;
 
 namespace {
@@ -813,6 +815,7 @@ private slots:
         QVERIFY(fakeFolder.currentLocalState().find("A/t𠜎t"));
 
 #if !defined(Q_OS_MAC) && !defined(Q_OS_WIN)
+        try {
             // Try again with a locale that can represent ö but not 𠜎 (4-byte utf8).
             QTextCodec::setCodecForLocale(QTextCodec::codecForName("ISO-8859-15"));
             QVERIFY(QTextCodec::codecForLocale()->mibEnum() == 111);
@@ -843,6 +846,11 @@ private slots:
             QVERIFY(fakeFolder.currentRemoteState().find("C/tößt"));
 
             QTextCodec::setCodecForLocale(utf8Locale);
+        }
+        catch (const std::filesystem::filesystem_error &e)
+        {
+            qCritical() << e.what() << e.path1().c_str() << e.path2().c_str() << e.code().message().c_str();
+        }
 #endif
     }