Write time of use cases, as much as possible taking into account the reality of their own design scenarios of use cases a lot of time divisional scene versioned classification type 1 using the title will test purposes understand that 2 steps concise, clear 3 assert exactly 4 Note 5 Priority complex functions tests, each test point requires precise decomposition test design process to reflect the purpose of the test results and write code for the same purpose process results here owe a map to fix another day