add comments

qiniu_test.go

@@ -7,11 +7,13 @@ import (
 )
 
 func TestUpload(t *testing.T) {
-	path := "/Users/chen/Desktop/png-MicroService-by-StuQ.png"
+	path := "qiniu.go"
 	file, err := os.Open(path)
 	if err != nil {
 		t.Fatal(err)
 	}
+	defer file.Close()
+
 	info, _ := file.Stat()
 	url, err := FileUpload(info.Name(), info.Size(), file)
 	if err != nil {