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I would probably extend my classes to include large numbers, small numbers, fractional numbers and so on but at least I am vastly reducing the input set. Note however that these decisions are made on the basis of our assumed knowledge of the software, hardware and environment and can be just as flawed as the decision a programmer makes when implementing the code. Woe betide the tester who assumes that 264-1 is the same as 264 and only makes one test against them! 41 Glossary Acceptance Test Final functional testing used to evaluate the state of a product and determine its readiness for the end-user.

Characteristics of a Good Defect Report • • • • • • Objective – criticising someone else’s work can be difficult. Care should be taken that defects are objective, non-judgemental and unemotional. g. don’t say “your program crashed” say “the program crashed” and don’t use words like “stupid” or “broken”. Specific – one report should be logged per defect and only one defect per report. Concise – each defect report should be simple and to-the-point. Defects should be reviewed and edited after being written to reduce unnecessary complexity.

By looking at the average age of Minor 4 3 5 9 9 defects in each status you can predict how long a Figure 12: Defect status report given number of defects will take to fix. By far and away, the best defectreport is the defect status trend as a graph. This shows the total number of defects by status over time (see below). The great advantage of this graph is that it allows you to predict the future. If you take the graph at September and plot a line down the curve of the 'fixed' defects – it cuts the x-axis after the end of December.

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A Software Testing Primer by Nick Jenkins


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