This paper is an overview of software unit testing. It defines unit testing, and discusses many of the issues, which must be addressed when planning for unit testing. It also makes suggestions for appropriate levels of formality and thoroughness of unit testing. Software unit testing is an integral part of an efficient and effective strategy for testing systems. The designer of the code under test best performs it. The appropriate level of formality and thoroughness of the testing will vary from project to project, and even within a project depending on the criticality, complexity, and risk associated with the unit. The policy in this regard should be decided early in test planning, and documented, usually in the Project Plan or separate Master Test Plan. In most cases it is acceptable to adopt an approach which requires little documentation overhead. However there are some basic requirements which should always be met. In particular it must be reviewable, repeatable, and archivable. Commonly, unit testing will be recorded in lab books, or in hand-written notes on code listings stored in the project journal, with guidance provided by a checklist that identifies the required unit testing activities.
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