Software testing one

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Regression testing alone is insufficient and suffers from fatigue over time as bugs are fixed but new runs provide little additional information. To improve test coverage and effectiveness, complementary techniques should be combined, such as combining automation with risk-based equivalence analysis. The coverage achieved by combining techniques can exceed the sum of using each technique individually. When adopting new techniques, organizations should determine their current test approach and weaknesses, identify a practical and risk-focused additional technique to address shortcomings, and apply the new technique until proficiency is achieved through iteration.

Applying Complementary Techniques Together
 Regression testing alone suffers fatigue
 The bugs get fixed and new runs add little info
 Symptom of weak coverage
 Combine automation w/ suitable variance
 E.g. Risk-based equivalence analysis
 Coverage of the combination
can beat sum of the parts Equivalence
Risk-based
Regression

How To Adopt New Techniques
1. Answer these questions:
 What techniques do you use in your test approach
now?
 What is its greatest shortcoming?
 What one technique could you add to make the
greatest improvement, consistent with a good test
approach:
• Risk-focused?
• Product-specific?
• Practical?
• Defensible?
1. Apply that additional technique until proficient
2. Iterate

Software testing one

1. Principles of Software Testing

2. Applying Complementary Techniques Together  Regression testing alone suffers fatigue  The bugs get fixed and new runs add little info  Symptom of weak coverage  Combine automation w/ suitable variance  E.g. Risk-based equivalence analysis  Coverage of the combination can beat sum of the parts Equivalence Risk-based Regression

3. How To Adopt New Techniques 1. Answer these questions:  What techniques do you use in your test approach now?  What is its greatest shortcoming?  What one technique could you add to make the greatest improvement, consistent with a good test approach: • Risk-focused? • Product-specific? • Practical? • Defensible? 1. Apply that additional technique until proficient 2. Iterate

Editor's Notes

#2: Principles of Software Testing for Testers Instructor Notes Module 0: About This Course
#3: Principles of Software Testing for Testers Instructor Notes Module 0: About This Course Another way of combining techniques is to use one technique to extend another. For example , Regression testing is much more effective when extended with other testing techniques than when used in isolation. Examples of combination include… Equivalence analysis : There are many techniques available for extending test automation with variable data and all regression tools support variable data. If you have done good risk-based equivalence analysis, and can extend function regression testing with good test data, you can achieve the combined benefits of those techniques. Function testing : XP (eXtreme Programming) advocates that developers produce exhaustive automated unit tests that are run after every coding task to facilitate refactoring (changing code). Because the XP test suites are sufficiently comprehensive and are run continuously, they provide immediate feedback of any unforeseen breakage caused by a change. JUnit is a popular open source tool for this. Specification-based testing : An important extension to spec-based testing is the practice of Test-first Design (covered in RUP as a developer practice and also advocated by XP). With Test-first Design, you use tests as a primary form of requirements specification and rerun the tests on every build to provide immediate feedback on any breakage. Scenario testing: Some teams have success automating simple scenarios and interactions. This works when you can easily maintain the tests are are conscientious about discarding tests that no longer add useful information. A good heurisitc is to make sure that test maintenance cost is kept low to avoid blocking any test development.
#4: Principles of Software Testing for Testers Instructor Notes Module 0: About This Course

Software testing one

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Editor's Notes