QSslConfiguration - improve code coverage

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

Change-Id: I472f59e8e7292786c80d7c8dcebde53a2982e1ec
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
(cherry picked from commit 1157167a5c69e253fdeb6c8ad532c5d52e150769)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

2 files changed, 43 insertions, 4 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()
diff --git a/tests/auto/network/ssl/qsslsocket/tst_qsslsocket.cpp b/tests/auto/network/ssl/qsslsocket/tst_qsslsocket.cpp
index baa4f34df4..2bfb905620 100644
--- a/tests/auto/network/ssl/qsslsocket/tst_qsslsocket.cpp
+++ b/tests/auto/network/ssl/qsslsocket/tst_qsslsocket.cpp
@@ -192,7 +192,7 @@ private slots:
     void setLocalCertificate();
     void localCertificateChain();
     void setLocalCertificateChain();
-    void setPrivateKey();
+    void tlsConfiguration();
     void setSocketDescriptor();
     void setSslConfiguration_data();
     void setSslConfiguration();
@@ -1588,8 +1588,33 @@ void tst_QSslSocket::setLocalCertificateChain()
     QCOMPARE(chain[1].serialNumber(), QByteArray("3b:eb:99:c5:ea:d8:0b:5d:0b:97:5d:4f:06:75:4b:e1"));
 }
 
-void tst_QSslSocket::setPrivateKey()
+void tst_QSslSocket::tlsConfiguration()
 {
+    QFETCH_GLOBAL(const bool, setProxy);
+    if (setProxy)
+        return;
+    // Test some things not covered by any other auto-test.
+    QSslSocket socket;
+    auto tlsConfig = socket.sslConfiguration();
+    QVERIFY(tlsConfig.sessionCipher().isNull());
+    QCOMPARE(tlsConfig.addCaCertificates(QStringLiteral("nonexisting/chain.crt")), false);
+    QCOMPARE(tlsConfig.sessionProtocol(), QSsl::UnknownProtocol);
+    QSslConfiguration nullConfig;
+    QVERIFY(nullConfig.isNull());
+#ifndef QT_NO_OPENSSL
+    nullConfig.setEllipticCurves(tlsConfig.ellipticCurves());
+    QCOMPARE(nullConfig.ellipticCurves(), tlsConfig.ellipticCurves());
+#endif
+    QMap<QByteArray, QVariant> backendConfig;
+    backendConfig["DTLSMTU"] = QVariant::fromValue(1024);
+    backendConfig["DTLSTIMEOUTMS"] = QVariant::fromValue(1000);
+    nullConfig.setBackendConfiguration(backendConfig);
+    QCOMPARE(nullConfig.backendConfiguration(), backendConfig);
+    QTest::ignoreMessage(QtWarningMsg, "QSslConfiguration::setPeerVerifyDepth: cannot set negative depth of -1000");
+    nullConfig.setPeerVerifyDepth(-1000);
+    QVERIFY(nullConfig.peerVerifyDepth() != -1000);
+    nullConfig.setPeerVerifyDepth(100);
+    QCOMPARE(nullConfig.peerVerifyDepth(), 100);
 }
 
 void tst_QSslSocket::setSocketDescriptor()