Testingtechniques And Strategy

Lecture 14: Testing Techniques and Strategies SACHIN

Today’s Topics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],SACHIN

Software Testing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],SACHIN

Testing Objectives ,[object Object],[object Object],[object Object],[object Object],[object Object],SACHIN

Testing Principles ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],SACHIN

Software Testability ,[object Object],[object Object],[object Object],[object Object],Characteristics that lead to testable software: ,[object Object],[object Object],[object Object],SACHIN

Operability ,[object Object],[object Object],[object Object],The better it works, the more efficiently it can be tested SACHIN

Observability ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],What you see is what you test SACHIN

Controllability ,[object Object],[object Object],[object Object],[object Object],[object Object],The better we can control the software, the more the testing can be automated SACHIN

Decomposability ,[object Object],[object Object],By controlling the scope of testing, we can more quickly isolate problems and perform smarter retesting SACHIN

Simplicity ,[object Object],[object Object],[object Object],The less there is to test, the more quickly we can test it SACHIN

Stability ,[object Object],[object Object],[object Object],[object Object],[object Object],The fewer the changes, the fewer the disruptions to testing SACHIN

Understandability ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],The fewer the changes, the fewer the disruptions to testing SACHIN

Test Characteristics ,[object Object],[object Object],[object Object],[object Object],SACHIN

Test Case Design ,[object Object],[object Object],[object Object],[object Object],SACHIN

White-Box Testing ,[object Object],[object Object],[object Object],[object Object],SACHIN

Why White-Box Testing? ,[object Object],[object Object],[object Object],SACHIN

Basis Path Testing ,[object Object],[object Object],[object Object],[object Object],SACHIN

Basis Path Testing [2] Flow Graph : Representation of Structured Programming Constructs [From SEPA 5/e] SACHIN

Cyclomatic Complexity V(G)=E-N+2 = 4 Independent Paths 1: 1,11 2: 1,2,3,4,5,10,1,11 3: 1,2,3,6,8,9,10,1,11 4: 1,2,3,6,7,9,10,1,11 V(G): upper bound on number of tests to ensure all code has been executed [From SEPA 5/e] SACHIN

Black Box Testing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],SACHIN

Black Box Testing [2] ,[object Object],[object Object],[object Object],[object Object],SACHIN

Black Box Testing [3] ,[object Object],[object Object],SACHIN

Comparison Testing ,[object Object],[object Object],[object Object],[object Object],[object Object],SACHIN

Generic Testing Strategies ,[object Object],[object Object],[object Object],[object Object],SACHIN

Verification and Validation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],SACHIN

Organization of Testing [From SEPA 5/e] SACHIN

Logarithmic Poisson execution-time model With sufficient fit, model predicts testing time required to reach acceptable failure rate [From SEPA 5/e] SACHIN

PRO: Higher-level (logic) modules tested early CON: Lower-level (reusable) modules tested late [From SEPA 5/e] SACHIN

PRO: Lower-level (reusable) modules tested early CON: Higher-level (logic) modules tested late [From SEPA 5/e] SACHIN

Hybrid Approaches ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],SACHIN

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