diff --git a/g/os/gfcache/gfcache_z_unit_test.go b/g/os/gfcache/gfcache_z_unit_test.go
new file mode 100755
index 000000000..77b02403a
--- /dev/null
+++ b/g/os/gfcache/gfcache_z_unit_test.go
@@ -0,0 +1,65 @@
+// Copyright 2017 gf Author(https://github.com/gogf/gf). All Rights Reserved.
+//
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file,
+// You can obtain one at https://github.com/gogf/gf.
+
+// go test *.go -bench=".*" -benchmem
+
+package gfcache_test
+
+import (
+	"os"
+	"testing"
+	"time"
+
+	"github.com/gogf/gf/g/os/gfcache"
+	"github.com/gogf/gf/g/os/gfile"
+	"github.com/gogf/gf/g/test/gtest"
+)
+
+func TestGetContents(t *testing.T) {
+	gtest.Case(t, func() {
+
+		var f *os.File
+		var err error
+		fileName := "test.txt"
+		strTest := "123"
+
+		if !gfile.Exists(fileName) {
+			f, err = gfile.Create(fileName)
+			if err != nil {
+				t.Error("create file fail")
+			}
+		}
+
+		cache := gfcache.GetContents(fileName, 2)
+
+		if gfile.Exists(fileName) {
+			f, err = gfile.OpenFile(fileName, os.O_APPEND|os.O_WRONLY, os.ModeAppend)
+			if err != nil {
+				t.Error("file open fail", err)
+			}
+		}
+
+		defer f.Close()
+
+		_, err = f.Write([]byte(strTest))
+		if err != nil {
+			t.Error("write error", err)
+		}
+
+		cache = gfcache.GetContents(fileName)
+		gtest.Assert(cache, "")
+
+		time.Sleep(time.Duration(4) * time.Second)
+
+		if gfile.Exists(fileName) {
+			err = gfile.Remove(fileName)
+			if err != nil {
+				t.Error("file remove fail", err)
+			}
+		}
+	})
+
+}