diff --git a/autotests/integration/effects/CMakeLists.txt b/autotests/integration/effects/CMakeLists.txt
--- a/autotests/integration/effects/CMakeLists.txt
+++ b/autotests/integration/effects/CMakeLists.txt
@@ -10,3 +10,4 @@
 integrationTest(WAYLAND_ONLY NAME testPopupOpenCloseAnimation SRCS popup_open_close_animation_test.cpp)
 integrationTest(WAYLAND_ONLY NAME testDesktopSwitchingAnimation SRCS desktop_switching_animation_test.cpp)
 integrationTest(WAYLAND_ONLY NAME testMinimizeAnimation SRCS minimize_animation_test.cpp)
+integrationTest(WAYLAND_ONLY NAME testMaximizeAnimation SRCS maximize_animation_test.cpp)
diff --git a/autotests/integration/effects/maximize_animation_test.cpp b/autotests/integration/effects/maximize_animation_test.cpp
new file mode 100644
--- /dev/null
+++ b/autotests/integration/effects/maximize_animation_test.cpp
@@ -0,0 +1,195 @@
+/********************************************************************
+KWin - the KDE window manager
+This file is part of the KDE project.
+
+Copyright (C) 2019 Vlad Zagorodniy <vladzzag@gmail.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*********************************************************************/
+
+#include "kwin_wayland_test.h"
+
+#include "abstract_client.h"
+#include "composite.h"
+#include "effectloader.h"
+#include "effects.h"
+#include "platform.h"
+#include "scene.h"
+#include "shell_client.h"
+#include "wayland_server.h"
+#include "workspace.h"
+
+#include "effect_builtins.h"
+
+#include <KWayland/Client/surface.h>
+#include <KWayland/Client/xdgshell.h>
+
+using namespace KWin;
+
+static const QString s_socketName = QStringLiteral("wayland_test_effects_maximize_animation-0");
+
+class MaximizeAnimationTest : public QObject
+{
+    Q_OBJECT
+
+private Q_SLOTS:
+    void initTestCase();
+    void init();
+    void cleanup();
+
+    void testMaximizeUnmaximize_data();
+    void testMaximizeUnmaximize();
+};
+
+void MaximizeAnimationTest::initTestCase()
+{
+    qputenv("XDG_DATA_DIRS", QCoreApplication::applicationDirPath().toUtf8());
+
+    qRegisterMetaType<KWin::AbstractClient *>();
+    qRegisterMetaType<KWin::ShellClient *>();
+    QSignalSpy workspaceCreatedSpy(kwinApp(), &Application::workspaceCreated);
+    QVERIFY(workspaceCreatedSpy.isValid());
+    kwinApp()->platform()->setInitialWindowSize(QSize(1280, 1024));
+    QVERIFY(waylandServer()->init(s_socketName.toLocal8Bit()));
+
+    auto config = KSharedConfig::openConfig(QString(), KConfig::SimpleConfig);
+    KConfigGroup plugins(config, QStringLiteral("Plugins"));
+    ScriptedEffectLoader loader;
+    const auto builtinNames = BuiltInEffects::availableEffectNames() << loader.listOfKnownEffects();
+    for (const QString &name : builtinNames) {
+        plugins.writeEntry(name + QStringLiteral("Enabled"), false);
+    }
+    config->sync();
+    kwinApp()->setConfig(config);
+
+    qputenv("KWIN_COMPOSE", QByteArrayLiteral("O2"));
+    qputenv("KWIN_EFFECTS_FORCE_ANIMATIONS", QByteArrayLiteral("1"));
+
+    kwinApp()->start();
+    QVERIFY(workspaceCreatedSpy.wait());
+    waylandServer()->initWorkspace();
+
+    auto scene = Compositor::self()->scene();
+    QVERIFY(scene);
+    QCOMPARE(scene->compositingType(), OpenGL2Compositing);
+}
+
+void MaximizeAnimationTest::init()
+{
+    QVERIFY(Test::setupWaylandConnection());
+}
+
+void MaximizeAnimationTest::cleanup()
+{
+    auto effectsImpl = qobject_cast<EffectsHandlerImpl *>(effects);
+    QVERIFY(effectsImpl);
+    effectsImpl->unloadAllEffects();
+    QVERIFY(effectsImpl->loadedEffects().isEmpty());
+
+    Test::destroyWaylandConnection();
+}
+
+void MaximizeAnimationTest::testMaximizeUnmaximize_data()
+{
+    QTest::addColumn<Test::ShellSurfaceType>("type");
+
+    QTest::newRow("xdgShellV5") << Test::ShellSurfaceType::XdgShellV5;
+    QTest::newRow("xdgShellV6") << Test::ShellSurfaceType::XdgShellV6;
+    QTest::newRow("xdgWmBase")  << Test::ShellSurfaceType::XdgShellStable;
+}
+
+void MaximizeAnimationTest::testMaximizeUnmaximize()
+{
+    // This test verifies that the maximize effect animates a client
+    // when it's maximized or restored.
+
+    // Create the test client.
+    using namespace KWayland::Client;
+    QScopedPointer<Surface> surface(Test::createSurface());
+    QVERIFY(!surface.isNull());
+    QFETCH(Test::ShellSurfaceType, type);
+    QScopedPointer<XdgShellSurface> shellSurface(qobject_cast<XdgShellSurface *>(
+        Test::createShellSurface(type, surface.data())));
+    ShellClient *client = Test::renderAndWaitForShown(surface.data(), QSize(100, 50), Qt::blue);
+    QVERIFY(client);
+    QVERIFY(client->isActive());
+    QCOMPARE(client->maximizeMode(), MaximizeMode::MaximizeRestore);
+
+    // Load effect that will be tested.
+    const QString effectName = QStringLiteral("kwin4_effect_maximize");
+    auto effectsImpl = qobject_cast<EffectsHandlerImpl *>(effects);
+    QVERIFY(effectsImpl);
+    QVERIFY(effectsImpl->loadEffect(effectName));
+    QCOMPARE(effectsImpl->loadedEffects().count(), 1);
+    QCOMPARE(effectsImpl->loadedEffects().first(), effectName);
+    Effect *effect = effectsImpl->findEffect(effectName);
+    QVERIFY(effect);
+    QVERIFY(!effect->isActive());
+
+    // Maximize the client.
+    QSignalSpy sizeChangeRequestedSpy(shellSurface.data(), &XdgShellSurface::sizeChanged);
+    QVERIFY(sizeChangeRequestedSpy.isValid());
+    QSignalSpy configureRequestedSpy(shellSurface.data(), &XdgShellSurface::configureRequested);
+    QVERIFY(configureRequestedSpy.isValid());
+    QSignalSpy geometryChangedSpy(client, &ShellClient::geometryChanged);
+    QVERIFY(geometryChangedSpy.isValid());
+    QSignalSpy maximizeChangedSpy(client, qOverload<AbstractClient *, bool, bool>(&ShellClient::clientMaximizedStateChanged));
+    QVERIFY(maximizeChangedSpy.isValid());
+
+    workspace()->slotWindowMaximize();
+    QVERIFY(sizeChangeRequestedSpy.wait());
+    QCOMPARE(sizeChangeRequestedSpy.count(), 1);
+
+    for (const auto &it : configureRequestedSpy) {
+        shellSurface->ackConfigure(it[2].toInt());
+    }
+    configureRequestedSpy.clear();
+
+    Test::render(surface.data(), sizeChangeRequestedSpy.first().first().toSize(), Qt::red);
+    QVERIFY(geometryChangedSpy.wait());
+    QCOMPARE(geometryChangedSpy.count(), 2);
+    QCOMPARE(maximizeChangedSpy.count(), 1);
+    QCOMPARE(client->maximizeMode(), MaximizeMode::MaximizeFull);
+    QVERIFY(effect->isActive());
+
+    // Eventually, the animation will be complete.
+    QTRY_VERIFY(!effect->isActive());
+
+    // Restore the client.
+    workspace()->slotWindowMaximize();
+    QVERIFY(sizeChangeRequestedSpy.wait());
+    QCOMPARE(sizeChangeRequestedSpy.count(), 2);
+
+    for (const auto &it : configureRequestedSpy) {
+        shellSurface->ackConfigure(it[2].toInt());
+    }
+    configureRequestedSpy.clear();
+
+    Test::render(surface.data(), sizeChangeRequestedSpy.last().first().toSize(), Qt::blue);
+    QVERIFY(geometryChangedSpy.wait());
+    QCOMPARE(geometryChangedSpy.count(), 4);
+    QCOMPARE(maximizeChangedSpy.count(), 2);
+    QCOMPARE(client->maximizeMode(), MaximizeMode::MaximizeRestore);
+    QVERIFY(effect->isActive());
+
+    // Eventually, the animation will be complete.
+    QTRY_VERIFY(!effect->isActive());
+
+    // Destroy the test client.
+    surface.reset();
+    QVERIFY(Test::waitForWindowDestroyed(client));
+}
+
+WAYLANDTEST_MAIN(MaximizeAnimationTest)
+#include "maximize_animation_test.moc"