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diff --git a/Tools/TestWebKitAPI/Tests/WebCore/FileSystem.cpp b/Tools/TestWebKitAPI/Tests/WebCore/FileSystem.cpp
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+++ b/Tools/TestWebKitAPI/Tests/WebCore/FileSystem.cpp
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+/*
+ * Copyright (C) 2015 Canon Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#include "Test.h"
+#include <WebCore/FileSystem.h>
+#include <wtf/MainThread.h>
+#include <wtf/StringExtras.h>
+
+using namespace WebCore;
+
+namespace TestWebKitAPI {
+
+const char* FileSystemTestData = "This is a test";
+
+// FIXME: Refactor FileSystemTest and SharedBufferTest as a single class.
+class FileSystemTest : public testing::Test {
+public:
+    virtual void SetUp() override
+    {
+        WTF::initializeMainThread();
+        
+        // create temp file
+        PlatformFileHandle handle;
+        m_tempFilePath = openTemporaryFile("tempTestFile", handle);
+        writeToFile(handle, FileSystemTestData, strlen(FileSystemTestData));
+        closeFile(handle); 
+
+        m_tempEmptyFilePath = openTemporaryFile("tempEmptyTestFile", handle);
+        closeFile(handle); 
+    }
+
+    virtual void TearDown() override
+    {
+        deleteFile(m_tempFilePath);
+        deleteFile(m_tempEmptyFilePath);
+    }
+
+    const String& tempFilePath() { return m_tempFilePath; }
+    const String& tempEmptyFilePath() { return m_tempEmptyFilePath; }
+
+private:
+    String m_tempFilePath;
+    String m_tempEmptyFilePath;
+};
+
+TEST_F(FileSystemTest, MappingMissingFile)
+{
+    bool success;
+    MappedFileData mappedFileData(String("not_existing_file"), success);
+    EXPECT_FALSE(success);
+    EXPECT_TRUE(!mappedFileData);
+}
+
+TEST_F(FileSystemTest, MappingExistingFile)
+{
+    bool success;
+    MappedFileData mappedFileData(tempFilePath(), success);
+    EXPECT_TRUE(success);
+    EXPECT_TRUE(!!mappedFileData);
+    EXPECT_TRUE(mappedFileData.size() == strlen(FileSystemTestData));
+    EXPECT_TRUE(strnstr(FileSystemTestData, static_cast<const char*>(mappedFileData.data()), mappedFileData.size()));
+}
+
+TEST_F(FileSystemTest, MappingExistingEmptyFile)
+{
+    bool success;
+    MappedFileData mappedFileData(tempEmptyFilePath(), success);
+    EXPECT_TRUE(success);
+    EXPECT_TRUE(!mappedFileData);
+}
+
+}