This practical, solutions-focused book shows software professionals how to easily and routinely achieve exceptionally high coverage in their unit tests, and use that coverage to significantly improve first-time quality in their software. Long-time developer and testing expert Stephen Vance shows why guidelines recommending coverage of 80% of statements (or some other arbitrary number) are insufficient -- and why 100% coverage in multiple metrics is both valuable and achievable. One realistic example at a time, Vance dispels the myth that high coverage unit testing is hard and not worth the effort by demonstrating the implementation patterns and refactorings that make it possible and even easy. With Vance's guidance, you can: * Unit test all or virtually all of your code * Improve the testability of your software designs * Consistently identify the most effective testing approaches for each project * Address specialized testing challenges such as databases, threaded code, or legacy upgrades * Write unit tests that can scale as your applications grow
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