1. A testing system for testing a biological information of a user comprising: a terminal device comprising a camera; a testing portion comprising: a receiving space; a bottom surface defining an opening communicating with the receiving space; a top surface opposite to the bottom surface; a first side surface positioned between and connecting the bottom surface and the top surface, and defining a slot communicating with the receiving space, the slot configured to receive a test paper which is wetted with a biologic fluid sample; and a light source received in the receiving space and configured to emit white light; and a wearable portion secured to the testing portion and configured to be placed around the terminal device; wherein the opening faces the camera when the wearable portion is placed around the terminal device, thereby allowing the camera to capture a standard image based on the white light emitted by the light source, and to capture a wet image of the test paper when the test paper is inserted into the slot, the biological information of the user is calculated according to a color comparison between the wet image and the standard image.