QSslConfiguration - improve code coverage

By adding auto-tests that were missing/not triggering the paths found
by LCOV.

Pick-to: 5.15
Pick-to: 6.0
Change-Id: I472f59e8e7292786c80d7c8dcebde53a2982e1ec
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

1 files changed, 16 insertions, 2 deletions

diff --git a/tests/auto/network/ssl/qdtls/tst_qdtls.cpp b/tests/auto/network/ssl/qdtls/tst_qdtls.cpp
index fd51c091a8..3742645390 100644
--- a/tests/auto/network/ssl/qdtls/tst_qdtls.cpp
+++ b/tests/auto/network/ssl/qdtls/tst_qdtls.cpp
@@ -39,11 +39,12 @@
 #include <QtNetwork/qdtls.h>
 #include <QtNetwork/qssl.h>
 
-#include <QtCore/qbytearray.h>
 #include <QtCore/qcryptographichash.h>
-#include <QtCore/qlist.h>
+#include <QtCore/qscopeguard.h>
+#include <QtCore/qbytearray.h>
 #include <QtCore/qobject.h>
 #include <QtCore/qstring.h>
+#include <QtCore/qlist.h>
 
 #include <algorithm>
 
@@ -311,6 +312,19 @@ void tst_QDtls::configuration()
         QCOMPARE(dtls.dtlsError(), QDtlsError::InvalidOperation);
         QCOMPARE(dtls.dtlsConfiguration(), config);
     }
+
+    static bool doneAlready = false;
+    if (!doneAlready) {
+        doneAlready = true;
+        QSslConfiguration nullConfig;
+        const auto defaultDtlsConfig = QSslConfiguration::defaultDtlsConfiguration();
+        const auto restoreDefault = qScopeGuard([&defaultDtlsConfig] {
+            QSslConfiguration::setDefaultDtlsConfiguration(defaultDtlsConfig);
+        });
+        QSslConfiguration::setDefaultDtlsConfiguration(nullConfig);
+        QCOMPARE(QSslConfiguration::defaultDtlsConfiguration(), nullConfig);
+        QVERIFY(QSslConfiguration::defaultDtlsConfiguration() != defaultDtlsConfig);
+    }
 }
 
 void tst_QDtls::invalidConfiguration()