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L4 - Software Testing Quality Assurance and Maintenance...

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Software Testing, Quality Assurance and Maintenance Winter 2010 Lecture 4 — January 11, 2010 Patrick Lam version 2 Some binary distinctions Let’s digress for a bit and define some older terms which we won’t use much in this course, but which we should discuss briefly. Black-box testing. Deriving tests from external descriptions of software: specifications, re- quirements, designs; anything but the code. White-box testing. Deriving tests from the source code, e.g. branches, conditions, statements. Our model-based approach makes this distinction less important. Two ideologies for constructing tests: Top-down testing. Constructing tests of behaviour starting with main() . Bottom-up testing. Constructing tests of behaviour starting at the leaves of the call graph. Neither of these techniques work out completely in practice; top-down is impractical because it’s hard to control each leaf procedure individuall from main() , and bottom-up because it’s hard to test methods working together. Usually we use middle-out approaches. Two different approaches to quality assurance: Static: approaches that don’t involve running the code, e.g. type checking, code reviews. Dynamic: usual testing-based approaches; we focus on these in this course.
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