diff --git a/internal/util/tests/qos_convert_test.go b/internal/util/tests/qos_convert_test.go
new file mode 100644
index 00000000..ec7b54f2
--- /dev/null
+++ b/internal/util/tests/qos_convert_test.go
@@ -0,0 +1,36 @@
+package qos_convert_test
+
+import (
+	"testing"
+
+	"github.com/free5gc/smf/internal/util"
+)
+
+func TestBitRateToKbpsWithValidBitRateShouldReturnValidKbpsBitRate(t *testing.T) {
+	var bitrate string = "1000 Mbps"
+	var correctBitRateKbps uint64 = 1000000
+
+	bitrateKbps, err := util.BitRateTokbps(bitrate)
+
+	t.Log("Check: err should be nil since act should work correctly.")
+	if err != nil {
+		t.Errorf("Error: err should be nil but it returns %s", err)
+	}
+	t.Log("Check: convert should act correctly.")
+	if bitrateKbps != correctBitRateKbps {
+		t.Errorf("Error: bitrate convert failed. Expect: %d. Actually: %d", correctBitRateKbps, bitrateKbps)
+	}
+	t.Log("Passed.")
+}
+
+func TestBitRateToKbpsWithInvalidBitRateShouldReturnError(t *testing.T) {
+	var bitrate string = "1000" // The unit is absent. It should raise error for `BitRateToKbps`.
+
+	_, err := util.BitRateTokbps(bitrate)
+
+	t.Log("Check: err should not be nil.")
+	if err == nil {
+		t.Error("Error: err should not be nil.")
+	}
+	t.Log("Passed.")
+}