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diff --git a/tests/auto/quickcontrols2/qquickstyle/tst_qquickstyle.cpp b/tests/auto/quickcontrols2/qquickstyle/tst_qquickstyle.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtTest/qtest.h>
+#include <QtQml/qqmlengine.h>
+#include <QtQml/qqmlcomponent.h>
+#include <QtQuickControls2/qquickstyle.h>
+#include <QtQuickControls2/private/qquickstyle_p.h>
+#include <QtQuickTemplates2/private/qquicklabel_p.h>
+#include <QtQuickTemplates2/private/qquicklabel_p_p.h>
+#include <QtQuickTemplates2/private/qquicktheme_p.h>
+#include <QtGui/private/qguiapplication_p.h>
+
+#include "../shared/util.h"
+
+class tst_QQuickStyle : public QQmlDataTest
+{
+    Q_OBJECT
+
+private slots:
+    void cleanup();
+    void lookup();
+    void configurationFile_data();
+    void configurationFile();
+    void commandLineArgument();
+    void environmentVariables();
+
+private:
+    Q_REQUIRED_RESULT bool loadControls();
+    void unloadControls();
+};
+
+void tst_QQuickStyle::cleanup()
+{
+    unloadControls();
+
+    QGuiApplicationPrivate::styleOverride.clear();
+    qunsetenv("QT_QUICK_CONTROLS_STYLE");
+    qunsetenv("QT_QUICK_CONTROLS_FALLBACK_STYLE");
+    qunsetenv("QT_QUICK_CONTROLS_CONF");
+}
+
+bool tst_QQuickStyle::loadControls()
+{
+    QQmlEngine engine;
+    engine.addImportPath(dataDirectory());
+    QQmlComponent component(&engine);
+    component.setData("import QtQuick; import QtQuick.Controls; Control { }", QUrl());
+
+    QScopedPointer<QObject> object(component.create());
+    if (object.isNull()) {
+        qWarning() << component.errorString();
+        return false;
+    }
+    return true;
+}
+
+void tst_QQuickStyle::unloadControls()
+{
+    qmlClearTypeRegistrations();
+}
+
+void tst_QQuickStyle::lookup()
+{
+    QQuickStyle::setStyle("Material");
+    QCOMPARE(QQuickStyle::name(), QString("Material"));
+
+    QVERIFY(loadControls());
+
+    // The font size for editors in the (default) Normal variant is 16.
+    // If this is wrong, the style plugin may not have been loaded.
+    QCOMPARE(QQuickTheme::instance()->font(QQuickTheme::TextArea).pixelSize(), 16);
+
+    QCOMPARE(QQuickStyle::name(), QString("Material"));
+}
+
+void tst_QQuickStyle::configurationFile_data()
+{
+    QTest::addColumn<QString>("fileName");
+    QTest::addColumn<QString>("expectedStyle");
+
+    QTest::newRow("Basic") << "basic.conf" << "Basic";
+    QTest::newRow("Fusion") << "fusion.conf" << "Fusion";
+    QTest::newRow("Imagine") << "imagine.conf" << "Imagine";
+    QTest::newRow("Material") << "material.conf" << "Material";
+    QTest::newRow("Universal") << "universal.conf" << "Universal";
+    QTest::newRow("Custom") << "custom.conf" << "Custom";
+}
+
+void tst_QQuickStyle::configurationFile()
+{
+    QFETCH(QString, fileName);
+    QFETCH(QString, expectedStyle);
+
+    qputenv("QT_QUICK_CONTROLS_CONF", testFile(fileName).toLocal8Bit());
+
+    // Load a control. The import causes the configuration file to be read.
+    QQmlEngine engine;
+    engine.addImportPath(":/data");
+    QQmlComponent labelComponent(&engine);
+    labelComponent.setData("import QtQuick; import QtQuick.Controls; Label {}", QUrl());
+
+    QScopedPointer<QObject> object(labelComponent.create());
+    QVERIFY2(!object.isNull(), qPrintable(labelComponent.errorString()));
+
+    QCOMPARE(QQuickStyle::name(), expectedStyle);
+    QVERIFY(!QQuickStylePrivate::isUsingDefaultStyle());
+
+    // Test that fonts and palettes specified in configuration files are respected.
+    QQuickLabel *label = qobject_cast<QQuickLabel *>(object.data());
+    QVERIFY(label);
+    // Make it small so that there's less possibility for the default/system
+    // pixel size to match it and give us false positives.
+    QCOMPARE(label->font().pixelSize(), 3);
+    QCOMPARE(QQuickLabelPrivate::get(label)->palette()->windowText(), Qt::red);
+}
+
+void tst_QQuickStyle::commandLineArgument()
+{
+    QGuiApplicationPrivate::styleOverride = "CmdLineArgStyle";
+
+    QVERIFY(loadControls());
+
+    QCOMPARE(QQuickStyle::name(), QString("CmdLineArgStyle"));
+}
+
+void tst_QQuickStyle::environmentVariables()
+{
+    qputenv("QT_QUICK_CONTROLS_STYLE", "EnvVarStyle");
+    qputenv("QT_QUICK_CONTROLS_FALLBACK_STYLE", "EnvVarFallbackStyle");
+    QTest::ignoreMessage(QtWarningMsg, "QT_QUICK_CONTROLS_FALLBACK_STYLE: the specified fallback style" \
+        " \"EnvVarFallbackStyle\" is not one of the built-in Qt Quick Controls 2 styles");
+    QCOMPARE(QQuickStyle::name(), QString("EnvVarStyle"));
+    QCOMPARE(QQuickStylePrivate::fallbackStyle(), QString());
+}
+
+QTEST_MAIN(tst_QQuickStyle)
+
+#include "tst_qquickstyle.moc"