Bai giang-se-03mar14

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Bài giảng môn Kỹ nghệ phần mềm cho lớp 56PM, Khoa Công nghệ thông tin, Trường Đại học Xây Dựng, ngày 03 tháng 03 năm 2014.

Text of Bai giang-se-03mar14

  • 1. Chapters Chapter IV Software Testing Software Testing Techniques Software Testing Strategies 1

2. Software Testing 2 Testing Objectives Testing is a process of executing a program with the intent of finding an error. A successful test is one that uncovers an as-yet- undiscovered error. 3. Software Testing 3 Attributes of a good test A good test has a high probability of finding an error. A good test is not redundant. A good test should be best of breed. A good test should be neither too simple nor too complex. 4. Software Testing Principles 4 Testing Principles All tests should be traceable to customer requirements. Tests should be planned long before testing begins. The Pareto principle applies to software testing. Testing should begin in the small and progress toward testing in the large. Exhaustive testing is not possible. To be most effective, testing should be conducted by an independent third party. 5. Software Testing Techniques 5 Test Case Design Methods Black-Box Testing: Knowing the specified function that a product has been designed to perform, tests can be conducted that demonstrate each function is fully operational while at the same time searching for errors in each function. White-Box Testing: Knowing the internal workings of a product, tests can be conducted to ensure that internal operations are performed according to specifications and all internal components have been adequately exercised. 6. White-Box Testing 6 White-box testing (glass-box testing) uses the control structure of the procedural design to derive test cases, in such a way that guarantee that all independent paths within a module have been exercised at least once, exercise all logical decisions on their true and false sides, execute all loops at their boundaries and within their operational bounds, exercise internal data structures to ensure their validity. 7. White-Box Testing Techniques 7 Basis Path Testing (Tom McCabe) enables the test case designer to derive a logical complexity measure of a procedural design and use this measure as a guide for defining a basis set of execution paths. 8. White-Box Testing Techniques 8 Basis Path Testing (cont.) 9. White-Box Testing Techniques 9 Basis Path Testing (cont.) 10. Black-Box Testing 10 Black-box testing (behavioral testing) focuses on the functional requirements of the software, enables the software engineer to derive sets of input conditions that will fully exercise all functional requirements for a program. Black-box testing attempts to find errors in the following categories: incorrect or missing functions, interface errors, errors in data structures or external database access, behavior or performance errors, initialization and termination errors. 11. Black-Box Testing 11 Graph-Based Testing Methods the first step is to understand the objects that are modeled in software and the relationships that connect these objects. next step is to define a series of tests that verify all objects have the expected relationship to one another (1) creating a graph of important objects and their relationships (2) devising a series of tests that will cover the graph so that each object and relationship is exercised and errors are uncovered. 12. Black-Box Testing 12 Graph-Based Testing Methods A graph is a collection of nodes that represent objects; links that represent the relationships between objects; node weights that describe the properties of a node (e.g., a specific data value or state behavior); link weights that describe some characteristic of a link. 13. Black-Box Testing 13 Graph-Based Testing Methods 14. Black-Box Testing 14 Graph-Based Testing Methods