diff --git a/sf-buffer/test/test_buffer_utils.cpp b/sf-buffer/test/test_buffer_utils.cpp
index c02a5f2..e973601 100644
--- a/sf-buffer/test/test_buffer_utils.cpp
+++ b/sf-buffer/test/test_buffer_utils.cpp
@@ -3,7 +3,38 @@
 
 using namespace std;
 
-TEST(BufferUtils, folder_test)
+TEST(BufferUtils, get_filename)
 {
+    auto expected_file = "/root/device-1/12300000/12345000.h5";
 
+    auto root_folder = "/root";
+    auto device_name = "device-1";
+
+    auto result = get_filename(
+            root_folder,
+            device_name,
+            12345000);
+
+    ASSERT_EQ(result, expected_file);
+
+    auto result2 = get_filename(
+            root_folder,
+            device_name,
+            12345999);
+
+    ASSERT_EQ(result2, expected_file);
+
+    auto result3 = get_filename(
+            root_folder,
+            device_name,
+            12346000);
+
+    ASSERT_NE(result3, expected_file);
+
+    auto result4 = get_filename(
+            root_folder,
+            device_name,
+            12344999);
+
+    ASSERT_NE(result4, expected_file);
 }
\ No newline at end of file