to express expectations, providing a mechanism to hook into or drive the SUT, executing the tests, and reporting results.

Various types of frameworks are available:

* Linear procedural code, possibly generated by tools like those that use record and playback
* Structured uses control structures - typically 'if-else', 'switch', 'for', 'while' conditions/ statements
* Data-driven data is persisted outside of tests in a database, spreadsheet, or other mechanism
* Keyword-driven

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