1 files changed, 11 insertions, 0 deletions
diff --git a/tests/auto/corelib/plugin/qlibrary/tst_qlibrary.cpp b/tests/auto/corelib/plugin/qlibrary/tst_qlibrary.cpp
index d60e1514b9..2244f3e041 100644
--- a/tests/auto/corelib/plugin/qlibrary/tst_qlibrary.cpp
+++ b/tests/auto/corelib/plugin/qlibrary/tst_qlibrary.cpp
@@ -456,10 +456,21 @@ void tst_QLibrary::loadHints()
     if (int(loadHints) != 0) {
         lh |= library.loadHints();
         library.setLoadHints(lh);
+
+        // confirm that another QLibrary doesn't get affected - QTBUG-39642
+        QCOMPARE(QLibrary().loadHints(), QLibrary::LoadHints());
     }
     library.setFileName(lib);
     QCOMPARE(library.loadHints(), lh);
     bool ok = library.load();
+
+    // we can't change the hints anymore
+    library.setLoadHints(QLibrary::LoadHints());
+    QCOMPARE(library.loadHints(), lh);
+
+    // confirm that a new QLibrary inherits the hints too
+    QCOMPARE(QLibrary(lib).loadHints(), lh);
+
     if ( result ) {
         QVERIFY( ok );
         QVERIFY(library.unload());