test non-existant user

kfsend_test.go

@@ -18,6 +18,7 @@ func TestSendTxt(t *testing.T) {
 	//kfSendTxt(toUser, msg)
 	kfSendTxtAs(toUser, msg, "孙鹏")
 	kfSendTxtAs(toUser, msg, "理事")
+	kfSendTxtAs(toUser, msg, "不存在的用户")
 	//kfSendTxtAs(toUser, msg, "kf2002@gh_f09231355c68")
 }