Add buffer util tests

sf-buffer/test/CMakeLists.txt

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+add_executable(sf-buffer_tests test_main.cpp)
+
+target_link_libraries(sf-buffer_tests
+        core-writer
+        gtest
+        zmq
+        hdf5
+        hdf5_hl
+        hdf5_cpp)

sf-buffer/test/test_buffer_utils.cpp

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+#include "gtest/gtest.h"
+#include "../src/buffer_utils.hpp"
+
+using namespace std;
+
+TEST(BufferUtils, folder_test)
+{
+
+}

sf-buffer/test/test_main.cpp

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+#include "gtest/gtest.h"
+#include "test_buffer_utils.cpp"
+
+using namespace std;
+
+int main(int argc, char **argv) {
+  ::testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}