Decision Testing and Decision Coverage. ISTQB Whitebox techniques with TestCompetence
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The document outlines key concepts related to decision testing and coverage in software testing, providing definitions for terms such as branch, decision, and coverage percentages. It emphasizes the relationship between branch and decision coverage, stating that achieving 100% branch coverage ensures both 100% decision and statement coverage. The document also includes various examples and scenarios to illustrate the principles behind effective testing techniques.
Decision Testing and Decision Coverage. ISTQB Whitebox techniques with TestCompetence
- 1. Decision Testing and Decision Coverage with Prepare yourself for the ISTQB exam
- 2. Dictionary branch: A basic block that can be selected for execution based on a program construct in which one of two or more alternative program paths is available, e.g. case, jump, go to, if-then- else. branch coverage: The percentage of branches that have been exercised by a test suite. 100% branch coverage implies both 100% decision coverage and 100% statement coverage. branch testing: A white box test design technique in which test cases are designed to execute branches. From „Standard glossary of terms used in Software Testing” Copyright © 2013
- 3. Dictionary decision: A program point at which the control flow has two or more alternative routes. A node with two or more links to separate branches. decision coverage: The percentage of decision outcomes that have been exercised by a test suite. 100% decision coverage implies both 100% branch coverage and 100% statement coverage. decision testing: A white box test design technique in which test cases are designed to execute decision outcomes. decision outcome: The result of a decision (which therefore determines the branches to be taken). From „Standard glossary of terms used in Software Testing” Copyright © 2013
- 4. What is…? Decision coverage, related to branch testing, is the assessment of the percentage of decision outcomes (e.g. the True and False options of an IF statement) that have been exercised by a test case suite. Decision testing derives test cases to execute specific decision outcomes, normally to increase decision coverage. Decision testing is a form of control flow testing as it generates a specific flow of control through the decision points. Decision coverage is stronger than statement coverage: 100% decision coverage guarantees 100% statement coverage, but not vice versa. From „Certified Tester Foundation Level Syllabus (version 2011)” Copyright © 2013
- 5. Rules! 100% branch coverage implies 100% decision coverage. Branch testing = arc testing = algorithm testing From „Certified Tester Foundation Level Syllabus (version 2011)” Copyright © 2013
- 6. Examples with sequential code sep = az * wn; csc = dvz + isc + d; There are no decisions to take. Copyright © 2013
- 7. Examples with IF IF (vz) { fuf = azh - e; In order to cover all } decisions and branches, ic = pcg + icn / n; you need 2 test cases. Copyright © 2013
- 8. Examples with IF ELSE IF (lfn) { j = ag + vy - f; In order to cover all } decisions and branches, ELSE you need { 2 test cases. l = ar * hkh; } vgd = i * qla / p; Copyright © 2013
- 9. Examples with SWITCH SWITCH (i) { CASE 0: In order to cover all krg = z - kz; decisions and branches, break; you need CASE 1: 2 test cases. tob = zrc * cxd; break; } rl = gs / dl * s; Copyright © 2013
- 10. Examples with WHILE uyn = -9; WHILE (bo || uyn < -3) { In order to cover all qx = q - ba / i; decisions and branches, uyn++; you need } 1 test case. moa = 4; WHILE (ei || moa > -3) { h = udi * cj; moa--; } Copyright © 2013
- 11. Examples with FOR FOR (a = 5; a > -5; a--) { b = c + 1; In order to cover all } decisions and branches, you need 1 test case. Copyright © 2013
- 12. More examples IF (u) { IF (s) { In order to cover all l = el * n * iq; decisions and branches, } you need ELSE 4 test cases. { fz = ga / ca + vd; } } ELSE { IF (upd) { w = tvo / x + y; } ELSE { grm = neq + ads; } } e = lcu + b; Copyright © 2013
- 13. More examples h = -4; WHILE (ww || h < 6) { In order to cover all zx = 1; decisions and branches, WHILE (iya || zx > -9) you need { 1 test cases. hm = am * x; zx--; } h++; } ye = 7; WHILE (iob || ye > 2) { boi = nk - u + ijy; ye--; } Copyright © 2013
- 14. More examples vc = 8; WHILE (xa || vc > -2) { In order to cover all FOR (i = 0; i < 2; i++) decisions and branches, { you need FOR (qgn = 1; qgn > -2; qgn--) 1 test cases. { p = u * ufi; } } vc--; } FOR (ij = -2; ij > -12; ij--) { pqr = n + fdq / jx; } Copyright © 2012
- 15. More examples with… TestCompetence allows you to generate sample pseudocode to pracitse whitebox techniques including statement coverage… Copyright © 2013
- 16. More examples with… TestCompetence allows you to generate sample pseudocode to pracitse whitebox techniques including decision coverage… Choose the maximum number of Choose the instructions level of per level. nested statements. Choose the type of Choose the coverage type of from: statement. statement, decision, codition, multiple condition, GENERATE and modified your exercise. condition. Copyright © 2013
- 17. More examples with… You get pseudocode and sample answers just like during a regular ISTQB exam. Choose the right answer. Pseudocode Choose an answer. Copyright © 2013
- 18. More examples with… You get pseudocode and sample answers just like during a regular ISTQB exam. Choose the right answer. Pseudocode Your answer Right answer Copyright © 2013
- 19. How to get it… Visit TestCompetence.com and get one for only… EURO / USD Unlimited number of exercises during 24 hours! Copyright © 2013
- 20. Check also examples for… • Statement testing and coverage >> • Condition testing and coverage >> • Multiple condition testing and coverage >> • Modified condition decision combination (MC/CD) coverage >> Copyright © 2013
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