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A graphical representation of the test-driven development lifecycle. The TDD steps vary somewhat by author in count and description, but are generally as follows. These are based on the book Test-Driven Development by Example, [6] and Kent Beck's Canon TDD article. [8] 1. List scenarios for the new feature List the expected variants in the new ...
Kent Beck speaking in 2001. Kent Beck (born 1961) is an American software engineer and the creator of extreme programming, [1] a software development methodology that eschews rigid formal specification for a collaborative and iterative design process. Beck was one of the 17 original signatories of the Agile Manifesto, [1] the founding document ...
Extreme programming (XP) is a software development methodology intended to improve software quality and responsiveness to changing customer requirements. As a type of agile software development, [1] [2] [3] it advocates frequent releases in short development cycles, intended to improve productivity and introduce checkpoints at which new customer requirements can be adopted.
Test driven development proceeds by quickly cycling through the following steps, with each step taking minutes at most, preferably much less. Since each user story will usually require one to two days of work, a very large number of such cycles will be necessary per story.
In test-driven development tests are used to drive the implementation towards fulfilling the requirements. Tester-driven development instead shortcuts the process by removing the determination of requirements and letting the testers (or the QA team) drive what they think the software should be through the testing (or QA) process. [1]
SUnit is an automated testing framework written by Kent Beck in 1989; originally intended and often used for unit testing. It supports testing Smalltalk code via test code also written in Smalltalk. SUnit was adapted for Java as JUnit which was notably popular. Subsequently, adaptations were created for many other languages; many also popular.
In test-driven development (TDD), unit tests are written while the production code is written. Starting with working code, the developer adds test code for a required behavior, then adds just enough code to make the test pass, then refactors the code (including test code) as makes sense and then repeats by adding another test.
YAGNI is a principle behind the XP practice of "do the simplest thing that could possibly work" (DTSTTCPW). [2] [3] It is meant to be used in combination with several other practices, such as continuous refactoring, continuous automated unit testing, and continuous integration.
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