diff --git a/common/log/log_test.go b/common/log/log_test.go
index 447ae2f91..001884f07 100644
--- a/common/log/log_test.go
+++ b/common/log/log_test.go
@@ -1,6 +1,7 @@
 package log
 
 import (
+	"bytes"
 	"testing"
 
 	"github.com/v2ray/v2ray-core/testing/unit"
@@ -17,3 +18,14 @@ func TestLogLevelSetting(t *testing.T) {
 	assert.Pointer(debugLogger).Equals(noOpLoggerInstance)
 	assert.Pointer(infoLogger).Equals(streamLoggerInstance)
 }
+
+func TestStreamLogger(t *testing.T) {
+	assert := unit.Assert(t)
+
+	buffer := bytes.NewBuffer(make([]byte, 0, 1024))
+	logger := &streamLogger{
+		writer: buffer,
+	}
+	logger.WriteLog("TestPrefix: ", "Test %s Format", "Stream Logger")
+	assert.Bytes(buffer.Bytes()).Equals([]byte("TestPrefix: Test Stream Logger Format\n"))
+}