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diff --git a/tests/unit/unittest/pchtasksmerger-test.cpp b/tests/unit/unittest/pchtasksmerger-test.cpp
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+++ b/tests/unit/unittest/pchtasksmerger-test.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** 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.
+**
+****************************************************************************/
+
+#include "googletest.h"
+
+#include "mockpchtaskqueue.h"
+
+#include <pchtasksmerger.h>
+
+using ClangBackEnd::PchTask;
+using ClangBackEnd::PchTaskSet;
+
+class PchTasksMerger : public testing::Test
+{
+protected:
+    template<class T>
+    T clone(T entry)
+    {
+        return *&entry;
+    }
+
+protected:
+    NiceMock<MockPchTaskQueue> mockPchTaskQueue;
+    ClangBackEnd::PchTasksMerger merger{mockPchTaskQueue};
+    PchTask systemTask1{"ProjectPart1",
+                        {1, 2},
+                        {{"YI", "1", 1}, {"SAN", "3", 3}},
+                        {{"LIANG", 0}, {"YI", 1}}};
+    PchTask projectTask1{"ProjectPart1",
+                         {11, 12},
+                         {{"SE", "4", 4}, {"WU", "5", 5}},
+                         {{"ER", 2}, {"SAN", 3}}};
+    PchTask systemTask2{"ProjectPart2",
+                        {1, 2},
+                        {{"YI", "1", 1}, {"SAN", "3", 3}},
+                        {{"LIANG", 0}, {"YI", 1}}};
+    PchTask projectTask2{"ProjectPart2",
+                         {11, 12},
+                         {{"SE", "4", 4}, {"WU", "5", 5}},
+                         {{"ER", 2}, {"SAN", 3}}};
+};
+
+TEST_F(PchTasksMerger, AddProjectTasks)
+{
+    InSequence s;
+
+    EXPECT_CALL(mockPchTaskQueue, addProjectPchTasks(ElementsAre(projectTask1, projectTask2)));
+    EXPECT_CALL(mockPchTaskQueue, processEntries());
+
+    merger.mergeTasks(
+        {{clone(systemTask1), clone(projectTask1)}, {clone(systemTask1), clone(projectTask2)}});
+
+}
+
+TEST_F(PchTasksMerger, AddSystemTasks)
+{
+    InSequence s;
+
+    EXPECT_CALL(mockPchTaskQueue, addSystemPchTasks(ElementsAre(systemTask1, systemTask2)));
+    EXPECT_CALL(mockPchTaskQueue, processEntries());
+
+    merger.mergeTasks(
+        {{clone(systemTask1), clone(projectTask1)}, {clone(systemTask2), clone(projectTask2)}});
+}