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diff --git a/tests/benchmarks/testlib/tostring/tst_tostring.cpp b/tests/benchmarks/testlib/tostring/tst_tostring.cpp
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+++ b/tests/benchmarks/testlib/tostring/tst_tostring.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtTest/QtTest>
+#include <QtCore/qmath.h> // pi, e
+
+// Tests for QTest::toString
+class tst_toString : public QObject
+{
+    Q_OBJECT
+
+    template <typename T> void numeric_data();
+    template <typename T> void numeric();
+
+private slots:
+    void floatTst_data() { numeric_data<float>(); }
+    void floatTst() { numeric<float>(); }
+    void doubleTst_data() { numeric_data<double>(); }
+    void doubleTst() { numeric<double>(); }
+    void intTst_data() { numeric_data<int>(); }
+    void intTst() { numeric<int>(); }
+    void unsignedTst_data() { numeric_data<unsigned>(); }
+    void unsignedTst() { numeric<unsigned>(); }
+    void quint64Tst_data() { numeric_data<quint64>(); }
+    void quint64Tst() { numeric<quint64>(); }
+    void qint64Tst_data() { numeric_data<qint64>(); }
+    void qint64Tst() { numeric<qint64>(); }
+};
+
+template <typename T>
+void tst_toString::numeric_data()
+{
+    QTest::addColumn<T>("datum");
+    const bool floaty = std::is_floating_point<T>::value;
+
+    QTest::newRow("zero") << T(0);
+    QTest::newRow("one") << T(1);
+    if (floaty) {
+        QTest::newRow("pi") << T(M_PI);
+        QTest::newRow("e") << T(M_E);
+
+        // Stress canonicalisation of leading zeros on exponents:
+        QTest::newRow("milli") << T(1e-3);
+        QTest::newRow("micro") << T(1e-6);
+        QTest::newRow("mu0") << T(.4e-6 * M_PI); // Henry/metre
+        QTest::newRow("Planck") << T(662.606876e-36); // Joule.second/turn
+    }
+    QTest::newRow("2e9") << T(2000000000);
+    QTest::newRow("c.s/m") << T(299792458);
+    QTest::newRow("Avogadro") << T(6.022045e+23); // things/mol (.996 << 79, so ints overflow to max)
+
+    QTest::newRow("lowest") << std::numeric_limits<T>::lowest();
+    QTest::newRow("max") << std::numeric_limits<T>::max();
+    if (floaty) {
+        QTest::newRow("min") << std::numeric_limits<T>::min();
+
+        if (std::numeric_limits<T>::has_infinity) {
+            const T uge = std::numeric_limits<T>::infinity();
+            QTest::newRow("inf") << uge;
+            QTest::newRow("-inf") << -uge;
+        }
+        if (std::numeric_limits<T>::has_quiet_NaN)
+            QTest::newRow("nan") << std::numeric_limits<T>::quiet_NaN();
+    }
+}
+
+template <typename T>
+void tst_toString::numeric()
+{
+    QFETCH(T, datum);
+
+    QBENCHMARK {
+        QTest::toString<T>(datum);
+    }
+}
+
+QTEST_MAIN(tst_toString)
+#include "tst_tostring.moc"