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Agile Java¿: Crafting Code with Test-Driven DevelopmentAgile Java¿: Crafting Code with Test-Driven Development

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Like this article? We recommend

Like this article? We recommend

Agile Java¿: Crafting Code with Test-Driven DevelopmentAgile Java¿: Crafting Code with Test-Driven Development

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Reduced Number of Defects

Any defect is costly. Even with a perfect up-front design, it’s still possible to introduce defects that are very difficult to figure out.

With TDD, every piece of code exists because it was required by a test. That rule, in turn, means that we have solid unit test coverage. (We don’t have exhaustive coverage, which would be virtually impossible to provide.) Defect rates should come down significantly. Martin Fowler and Ron Jeffries talk about shops that severely reduced their numbers of defects. Most teams working on moderate-sized applications (several hundred thousand lines of code) have defect rates in the hundreds or even thousands per year. Shops doing TDD can achieve rates of less than a dozen per year (but they probably need to be adhering to other proven disciplines as well).

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Supplemental Privacy Statement for California Residents


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Changes to this Privacy Notice


We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020