make sure they use the same token for prod and test, so that access token will not be expired. by test cases.

common_test.go

 		"cmtWK2teRnLOXyO5dw7lJkETv9jCeNAqYyguEu5D8gG",
 		"wx876e233fde456b7b",
 		"4a91aa328569b10a9fb97adeb8b0af58",
-		"wechat_hitxy_access_token",
+		"/tmp/wechat_hitxy_access_token",
 		"gh_f09231355c68"}
 
 }