Use QLatin1String here

autotests/kextracolumnsproxymodeltest.cpp

@@ -169,9 +169,9 @@ private Q_SLOTS:
         QVERIFY(!secondParent.parent().isValid());
         QCOMPARE(indexToText(pm.index(0, 0, secondParent).parent()), indexToText(secondParent));
         QCOMPARE(indexToText(pm.index(0, 3, secondParent).parent()), indexToText(secondParent));
-        QVERIFY(indexToText(pm.index(0, 4)).startsWith(QStringLiteral("0,4,")));
+        QVERIFY(indexToText(pm.index(0, 4)).startsWith(QLatin1String("0,4,")));
         QCOMPARE(indexToText(pm.index(0, 4, secondParent).parent()), indexToText(secondParent));
-        QVERIFY(indexToText(pm.index(0, 5)).startsWith(QStringLiteral("0,5,")));
+        QVERIFY(indexToText(pm.index(0, 5)).startsWith(QLatin1String("0,5,")));
         QCOMPARE(indexToText(pm.index(0, 5, secondParent).parent()), indexToText(secondParent));
 
         QCOMPARE(pm.index(0, 0).sibling(0, 4).column(), 4);

autotests/proxymodeltestsuite/proxymodeltest.cpp

@@ -551,7 +551,7 @@ void ProxyModelTest::doTest()
     }
 
     static int numTests = 0;
-    if (qApp->arguments().contains(QStringLiteral("-count"))) {
+    if (qApp->arguments().contains(QLatin1String("-count"))) {
         qDebug() << "numTests" << ++numTests;
     }
 

tests/proxymodeltestapp/breadcrumbnavigationwidget.cpp

@@ -89,7 +89,7 @@ QVariant KBreadcrumbNavigationProxyModel::data(const QModelIndex &index, int rol
             dataList.prepend(sourceIndex.data().toString());
             sourceIndex = sourceIndex.parent();
         }
-        return dataList.join(QStringLiteral(" > "));
+        return dataList.join(QLatin1String(" > "));
     }
     return KSelectionProxyModel::data(index, role);
 }