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Graph Coverage
一、基本概念
- Test Requirements (TR) : Describe properties of test paths (描述了测试路径需要的元素)
- Test Criterion : Rules that define test requirements (定义TR的规则)
- Satisfaction : Given a set TR of test requirements for a criterion C, a set of tests T satisfies C on a graph if and only if for every test requirement in TR, there is a test path in path(T) that meets the test requirement tr
- Structural Coverage Criteria : Defined on a graph just in terms of nodes and edges
- Data Flow Coverage Criteria : Requires a graph to be annotated with references to variables
几种结构覆盖:
Node Coverage (NC) :节点覆盖的TR中必须包含图G中每个可达的节点
Edge Coverage (EC) : TR contains each reachable path of length up to 1, inclusive, in G.(Notice: we define “length up to 1” instead of simply “length 1”目的是让所有的图都能具有这几种结构覆盖的定义,包括只有一个节点的图,类似的还有边对覆盖对于只有两个节点的图的情况)
Edge-Pair Coverage (EPC) : TR contains each reachable path of length up to 2, inclusive, in G. (边对覆盖)
Complete Path Coverage (CPC) : TR contains all paths in G. (完全路径覆盖,当然如果路径中有循环则所有情况是不可能完全列举出来,因此CPC并不合理)
Specified Path Coverage (SPC):指定路径覆盖,即指定测试路径集合S,但是测试路径并不令人满意,因为会随着测试者的变动结果会变得不一样
二、示例
现在可以使用主路径处理循环问题
三、Simple Paths and Prime Paths (简单路径和主路径)
Simple Path : A path from node ni to nj is simple if no node appears more than once, except possibly the first and last nodes are the same (无环或者初始节点同时为最后节点)
Prime Path : A simple path that does not appear as a proper subpath of any other simple path (意思是这一条简单路径不能成为其他简单路径的子路径,我们称这条路径为主路径。)
Prime Path Coverage:TR contains each prime path in G.(主路径覆盖,将会遍历所有长度为0,1及以上的,意味着包括了点覆盖和边覆盖,但是边对覆盖不是主路径覆盖的子集)
例题
【解】
从每一个点向后扩展(也可以向前扩展或者两边扩展)
!表示扩展到结尾或者再向下扩展不再是简单路径,如0123!
*表示扩展到首尾相同
len=0 | len=1 | len=2 | len=3 | len=4 |
0 | 01 | 012 | 0123! |
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015 | 0156! |
| ||
04 | 046! |
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1 | 12 | 123 | 1231* |
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15 | 156! |
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2 | 23 | 231 | 2312* |
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2315 | 23156! | |||
3 | 31 | 312 | 3123* |
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315 | 3156! |
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4 | 46! |
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44* |
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5 | 56! |
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6! |
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Prime Path:
2→3→1→5→6 , 0→1→2→3 , 0→1→5→6 , 1→2→3→1 , 2→3→1→2 , 3→1→2→3 , 0→4→6 , 4→4
Test Path1: 0→1→2→3→1→2→3→1→5→6
Test Path2: 0→4→4→6
Test Path3: 0→1→5→6
Test Path4: 0→4→6
由于本题从控制流图开始,未给出题目描述,无法给出测试用例。
输入数据 | 预期输出 | |
测试用例1 | ||
测试用例2 | ||
测试用例3 | ||
测试用例4 |
本文标签: Graph Coverage
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