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22. Developer Testing
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22.6 Improving Your Testing
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The steps for improving your testing are similar to the steps for improving any other process. You have to know exactly what the process does so that you can vary it slightly and observe the effects of the variation. When you observe a change that has a positive effect, you modify the process so that it becomes a little better. The following subsections describe how to do this with testing.
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Planning to Test
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Part of planning to test is formalizing your plans in writing. To find further information on test documentation, refer to the Additional Resources section at the end of 32.
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One key to effective testing is planning from the beginning of the project to test. Putting testing on the same level of importance as design or coding means that time will be allocated to it, it will be viewed as important, and it will be a highquality process. Test planning is also an element of making the testing process repeatable. If you can t repeat it, you can t improve it.
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Retesting (Regression Testing)
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Suppose that you ve tested a product thoroughly and found no errors. Suppose that the product is then changed in one area and you want to be sure that it still passes all the tests it did before the change that the change didn t introduce any new defects. Testing designed to make sure the software hasn t taken a step backwards, or regressed, is called regression testing. One survey of data-processing personnel found that 52% of those surveyed weren t familiar with this concept (Beck and Perkins 1983). That s unfortunate because it s nearly impossible to produce a high-quality software product unless you can systematically retest it after changes have been made. If you run different tests after each change, you have no way of knowing for sure that no new defects have been introduced. Consequently, regression testing must run the same tests each time. Sometimes new tests are added as the product matures, but the old tests are kept too.
Automated Testing
The only practical way to manage regression testing is to automate it. People become numbed from running the same tests many times and seeing the same test results many times. It becomes too easy to overlook errors, which defeats the purpose of regression testing. Test guru Boriz Beizer reports that the error rate in manual testing is comparable to the bug rate in the code being tested. He estimates that in manual testing, only about half of all the tests are executed properly (Johnson 1994). Here are some of the benefits of test automation:
1 KEY POINT
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22. Developer Testing
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An automated test has a lower chance of being wrong than a manual test. Once you automate a test, it s readily available for the rest of the project with little incremental effort on your part. If tests are automated, they can be run frequently to see whether any code check-ins have broken the code. Test automation is part of the foundation of test-intensive practices like the daily build and smoke test and extreme programming. Automated tests improve your chances of detecting any given problem at the earliest possible moment, which tends to minimize the work needed to diagnose and correct the problem. Automated tests are especially useful in new, volatile technology environments because they flush out changes in the environments sooner rather than later.
9 CROSS-REFERENCE
For more on the relationship between technology maturity and development practices, see Section 4.3, Your Location on the Technology Wave.
The main tools used to support automatic testing provide test scaffolding, generate input, capture output, and compare actual output with expected output. The variety of tools discussed in the preceding section will perform some or all of these functions.
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