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软件测试与维护:6-dataflow-testing.pdf
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软件测试与维护:6-dataflow-testing.pdf
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Topics in Software Dynamic
White-box Testing
Part 2: Data-flow Testing
[Reading assignment: Chapter 7, pp. 105-122 plus many
things in slides that are not in the book … ]
![](https://csdnimg.cn/release/download_crawler_static/85636710/bg2.jpg)
Data-Flow Testing
•Data-flow testing uses the control
flowgraph to explore the unreasonable
things that can happen to data (i.e.,
anomalies).
•Consideration of data-flow anomalies
leads to test path selection strategies
that fill the gaps between complete path
testing and branch or statement testing.
![](https://csdnimg.cn/release/download_crawler_static/85636710/bg3.jpg)
Data-Flow Testing (Cont’d)
• Data-flow testing is the name given to a
family of test strategies based on selecting
paths through the program’s control flow in
order to explore sequences of events related to
the status of data objects.
• E.g., Pick enough paths to assure that:
– Every data object has been initialized prior to its use.
– All defined objects have been used at least once.
![](https://csdnimg.cn/release/download_crawler_static/85636710/bg4.jpg)
Data Object Categories
•(d) Defined, Created, Initialized
•(k) Killed, Undefined, Released
•(u) Used:
– (c) Used in a calculation
– (p) Used in a predicate
![](https://csdnimg.cn/release/download_crawler_static/85636710/bg5.jpg)
(d) Defined Objects
•An object (e.g., variable) is defined
when it:
–appears in a data declaration
–is assigned a new value
–is a file that has been opened
–is dynamically allocated
–...
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