Software Development
In computer programming and software testing, smoke testing is preliminary testing to reveal simple failures severe enough to reject a prospective software release. In this case, the smoke is metaphorical. A subset of test cases that cover the most important functionality of a component or system are selected and run, to ascertain if the most crucial functions of a program work correctly. For example, a smoke test may ask basic questions like "Does the program run?", "Does it open a window?", or "Does clicking the main button do anything?" The purpose is to determine whether the application is so badly broken that further testing is unnecessary. As the book "Lessons Learned in Software Testing" puts it, "smoke tests broadly cover product features in a limited time ... if key features don't work or if key bugs haven't yet been fixed, your team won't waste further time installing or testing".
Smoke testing performed on a particular build is also known as a build verification test.
A daily build and smoke test is among industry best practices. Smoke testing is also done by testers before accepting a build for further testing. Microsoft claims that after code reviews, "smoke testing is the most cost effective method for identifying and fixing defects in software". In Microsoft's case, a smoke test is the process of validating code changes before they are checked into source control.
Smoke tests can either be performed manually or using an automated tool. When automated tools are used, the tests are often initiated by the same process that generates the build itself.
Smoke tests can be broadly categorized as functional tests or unit tests. Functional tests exercise the complete program with various inputs. Unit tests exercise individual functions, subroutines, or object methods. Both functional testing tools and unit testing tools tend to be third-party products that are not part of the compiler suite. Functional tests may be a scripted series of program inputs, possibly even with an automated mechanism for controlling mouse movements. Unit tests may be separate functions within the code itself, or driver layer that links to the code without altering the code being tested.
Read more about this topic: Smoke Testing, Metaphorical Smoke Testing
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