diff --git a/trunk/src/utest/srs_utest_kernel.cpp b/trunk/src/utest/srs_utest_kernel.cpp
index 4dd81628e..f3420eac1 100644
--- a/trunk/src/utest/srs_utest_kernel.cpp
+++ b/trunk/src/utest/srs_utest_kernel.cpp
@@ -108,3 +108,89 @@ VOID TEST(KernelCodecTest, IsAudioSequenceHeader)
     pp[1] = 0x01;
     EXPECT_FALSE(SrsFlvCodec::video_is_sequence_header((int8_t*)pp, 2));
 }
+
+MockSrsFileWriter::MockSrsFileWriter()
+{
+}
+
+MockSrsFileWriter::~MockSrsFileWriter()
+{
+}
+
+int MockSrsFileWriter::open(string file)
+{
+    int ret = ERROR_SUCCESS;
+    return ret;
+}
+
+void MockSrsFileWriter::close()
+{
+    int ret = ERROR_SUCCESS;
+    return;
+}
+
+bool MockSrsFileWriter::is_open()
+{
+    return true;
+}
+
+int64_t MockSrsFileWriter::tellg()
+{
+    return 0;
+}
+
+int MockSrsFileWriter::write(void* buf, size_t count, ssize_t* pnwrite)
+{
+    int ret = ERROR_SUCCESS;
+    return ret;
+}
+
+MockSrsFileReader::MockSrsFileReader()
+{
+}
+
+MockSrsFileReader::~MockSrsFileReader()
+{
+}
+
+int MockSrsFileReader::open(string file)
+{
+    int ret = ERROR_SUCCESS;
+    return ret;
+}
+
+void MockSrsFileReader::close()
+{
+    int ret = ERROR_SUCCESS;
+    return;
+}
+
+bool MockSrsFileReader::is_open()
+{
+    return true;
+}
+
+int64_t MockSrsFileReader::tellg()
+{
+    return 0;
+}
+
+void MockSrsFileReader::skip(int64_t size)
+{
+}
+
+int64_t MockSrsFileReader::lseek(int64_t offset)
+{
+    return offset;
+}
+
+int64_t MockSrsFileReader::filesize()
+{
+    return 0;
+}
+
+int MockSrsFileReader::read(void* buf, size_t count, ssize_t* pnread)
+{
+    int ret = ERROR_SUCCESS;
+    return ret;
+}
diff --git a/trunk/src/utest/srs_utest_kernel.hpp b/trunk/src/utest/srs_utest_kernel.hpp
index d9d641b1f..f32543261 100644
--- a/trunk/src/utest/srs_utest_kernel.hpp
+++ b/trunk/src/utest/srs_utest_kernel.hpp
@@ -32,26 +32,37 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <string>
 #include <srs_kernel_flv.hpp>
 
-/*
-class MockSrsFileStream : public SrsFileStream
+class MockSrsFileWriter : public SrsFileWriter
 {
 public:
-    MockSrsFileStream();
-    virtual ~MockSrsFileStream();
-public:
+    MockSrsFileWriter();
+    virtual ~MockSrsFileWriter();
 public:
-    virtual int open_write(std::string file);
-    virtual int open_read(std::string file);
+    virtual int open(std::string file);
     virtual void close();
+public:
     virtual bool is_open();
+    virtual int64_t tellg();
 public:
-    virtual int read(void* buf, size_t count, ssize_t* pnread);
     virtual int write(void* buf, size_t count, ssize_t* pnwrite);
+};
+
+class MockSrsFileReader : public SrsFileReader
+{
+public:
+    MockSrsFileReader();
+    virtual ~MockSrsFileReader();
+public:
+    virtual int open(std::string file);
+    virtual void close();
+public:
+    virtual bool is_open();
     virtual int64_t tellg();
+    virtual void skip(int64_t size);
     virtual int64_t lseek(int64_t offset);
     virtual int64_t filesize();
-    virtual void skip(int64_t size);
+public:
+    virtual int read(void* buf, size_t count, ssize_t* pnread);
 };
-*/
 
 #endif