New PDF release: A Software Testing Primer

By Nick Jenkins

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If even a tiny portion of the original changes the hash value will no longer be the same. ) Release controls should apply within development as well as outside. When the dev team releases a product to the test team, it should follow a controlled process. This ensures that the teams are working on the same builds of the product, that defects are being tracked and resolved against a particular build and that there is a minimal lag in defect resolution. 39 Verification and Smoke Testing An important part of the release control process is the verification of the basic functionality of a particular release.

The use of personal metrics at all levels of software development allow individuals to tune their habits towards more effective behaviours. Testing Metrics for Developers If the purpose of developers is to produce code, then a measure of their effectiveness is how well that code works. The inverse of this is how buggy a particular piece of code is – the more defects, the less effective the code. One veteran quality metric that is often trotted out is “defects per thousand Lines Of Code” or “defects per KLOC” (also known as defect density).

But to measure this for a particular test effort is easy – simply divide the total number of hours spent in testing by the total number of defects logged (remember to include preparation time). Defect Discovery Rate = Number of defects found tester hours Note that you should only count defects that have been fixed in these equations. Why? New defects that haven't been validated are not defects. Defects which are rejected are also not defects. A defect which has been fixed, is definitely an error that need to be corrected.

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A Software Testing Primer by Nick Jenkins


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