Unittest I
	• Unit testing an important part of overall testing- centric development strategy. • Unit testing is not a replacement for higher-level functional or system testing: – Before writing code, it forces to detail requirements – While writing code, keeps from over-coding. • When all the test cases pass, the function is complete. – When refactoring code, assures new version behaves the same way as the old version. – When maintaining code, helps latest changes not to break other old code.