Task: Text Completion
Input (English): [header] How to write unit tests [title] Map your program into units. [step] The key aspect of a good unit test is that it checks just one portion of a program. Whether you are looking to test an existing program, or planning tests for a program that isn't written yet, you'll need to break it down into discrete parts (" units "). <sep> (A) This information helps to save work for lab experiments which most programs create. [substeps] Each unit should be considered one unit for speed. (B) You'll then write a unit test for each one. [substeps] The definition of a " unit " varies widely depending on the type of program you are developing. (C) [substeps] In units 6-12, a unit of a program 18-24 is integrated into a unit's classroom to evaluate its performance. Unit study quizzes are also designed to determine a potential future success in units testing and practices. (D) For instance, you will need to review 2.5 units of your current program, which will do most of the work for you. [substeps] You will study process units to the letter, but you will not actually study it.
Output (English): B