Basis path testing
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This document discusses basic path testing, which is a white box testing method based on cyclomatic complexity. It uses control flow graphs to establish path coverage criteria. The key steps are: 1) drawing a control flow graph, 2) determining cyclomatic complexity using various formulas, 3) finding a basis set of independent paths, and 4) generating test cases to cover each path. The example provided calculates the cyclomatic complexity as 3 and identifies 3 paths to test for the given code fragment.
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Basis path testing
- 2. Agenda Introduction Cyclomatic complexity Basic path testing approach Conclusion
- 3. Introduction A white box method Proposed by McCabe in 1980’s A hybrid of path testing and branch testing methods. Based on Cyclomatic complexity and uses control flow to establish the path coverage criteria.
- 4. Cyclomatic Complexity Developed by McCabe in 1976 Measures the number of linearly independent paths through a program. The higher the number the more complex the code.
- 5. Basic path testing approach Step 1: Draw a control flow graph. Step 2: Determine Cyclomatic complexity. Step 3: Find a basis set of paths. Step 4: Generate test cases for each path.
- 6. Draw a control flow graph Basic control flow graph structures:
- 7. Draw a control flow graph Arrows or edges represent flows of control. Circles or nodes represent actions. Areas bounded by edges and nodes are called regions. A predicate node is a node containing a condition.
- 8. Draw a control flow graph 1: IF A = 100 2: THEN IF B > C 3: THEN A = B 4: ELSEA= C 5: ENDIF 6: ENDIF 7: Print A
- 9. Determine Cyclomatic complexity There are several methods: 1. Cyclomatic complexity = edges - nodes + 2p 2. Cyclomatic complexity= Number of Predicate Nodes + 1 3. Cyclomatic complexity =number of regions in the control flow graph
- 10. Determine Cyclomatic complexity Cyclomatic complexity = edges - nodes + 2p p = number of unconnected parts of the graph. Cyclomatic complexity = 8-7+ 2*1= 3.
- 11. Determine Cyclomatic complexity Cyclomatic complexity = edges - nodes + 2p Cyclomatic complexity = 7-8+ 2*2= 3.
- 12. Determine Cyclomatic complexity Cyclomatic complexity= Number of Predicate Nodes + 1 Cyclomatic complexity = 2+1= 3.
- 13. Determine Cyclomatic complexity Cyclomatic complexity =number of regions in the control flow graph Cyclomatic complexity = 3
- 14. Find a basis set of paths Path 1: 1, 2, 3, 5, 6, 7. Path 2: 1, 2, 4, 5, 6, 7. Path 3: 1, 6, 7.
- 15. Generate test cases for each path We have 3 paths so we need at least one test case to cover each path. Write test case for these paths .
- 16. Conclusion Basic path testing helps us to reduce redundant tests. It suggests independent paths from which we write test cases needed to ensure that every statement and condition can be executed at least one time.
- 17. References W. Xibo and S. Na, "Automatic test data generation for path testing using genetic algorithms," in Measuring Technology and Mechatronics Automation (ICMTMA), 2011 Third International Conference on, vol. 1, pp. 596-599, IEEE, 2011.. B. Smith and L. A. Williams, "A survey on code coverage as a stopping criterion for unit testing," 2008. E. L. Lloyd and B. A. Malloy, "A study of test coverage adequacy in the presence of stubs," Journal of Object Technology, vol. 4, no. 5, pp. 117-137,2005.