Boundary value analysis
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Boundary value analysis is a technique used to test software at the boundaries or edges of different input conditions or equivalence partitions. It aims to find errors that occur at boundary values by testing a range of inputs including values that are minimum, maximum, just above or below the boundaries. The document provides examples of applying boundary value analysis to test different conditions for a password field length, age criteria for military service, postal rate calculations based on letter weight, and an application to determine if a job candidate can be hired based on their age. Boundary value analysis involves determining equivalence partitions, identifying the corresponding boundary values, and designing test cases that evaluate inputs at these boundary points.
Boundary value analysis
- 1. Boundary value analysis: Goals,Boundary value analysis: Goals, ExamplesExamples Vadym Mulyavka May 2014
- 2. Agenda 1.What is boundary value? 2.What is Boundary value analyze (BVA)? 3.Coals 4.Test case design by BVA proceeds 5.Example 2/12
- 3. Boundary value analyze “ Bugs lurk in corners and congregate at boundaries” Boris Beizer A boundary value: • an input value or output value which is on the edge of an equivalence partition or at the smallest incremental distance on either side of an edge, for example the minimum or maximum value of a range. What is Boundary value analyze (BVA)? - Is a technique to refine equivalence partitioning - based on testing at the boundaries between partitions 3/12
- 4. Boundary value analyze Equivalence classes Boundary values 4/12
- 5. Boundary value analyze Coals: • Find errors associated with the boundary values Test levels: • Unit • Integration • System • System-integration This technique is based on the risks: • A large number of problems occur at the boundaries of the input variables • Even if found equivalent classes correctly, boundary values may be incorrectly assigned to another class. 5/12
- 6. Boundary value analyze Test case design by BVA proceeds into 3 steps: • Determine the range of values (usually it is equivalence class) • Determine boundary values • Check input variable value at the minimum, just above minimum, just below minimum, normal, at the maximum, just below maximum, just above maximum 6/12
- 7. Boundary value analyze Example: bank has different charges depending on the transaction done. • 5% of the amount for transaction less than or equal to 1000 • 6% of the amount for transaction more than 1000 and less than or equal to 2000 • 7% of the amount for transaction more than 2000 7/12
- 8. Boundary value analyze Example: Password field can not be shorter than 4 and longer than 28 (including) characters (numeric and alphabetic) 8/12 Equivalance classes Boundary Values 0-3 {-1;0;1}, {2;3;4} 4-28 {3;4;5}, {27;28;29} 28+1
- 9. Boundary value analyze Example:The program selects candidates for military service focusing only on age (not less 18 and no more 25) Conscription in the army Not conscription Conscription Not conscription 17 18 25 26 Boundary values: {17;18,19} {24;25;26} 9/12
- 10. Boundary value analyze Example: In a system designed for postal services' payment: Letters up to 100g are called as ‘light’.Postal rates for sending the light letters up to 10g are $25. The next 40g should be played by $35. Each next 25g up to 100g should be played by an extra $10. Partitions should be designed for “grams”. Equivalance classes: Boundary Values 0 – 9g: 25$ {-1, 0, 1}, {8, 9, 10}, 10-49g: 35$ {9, 10, 11}, {48,49,50} 50-74g:10$ {49, 50, 51}, {73,74,75} 75-99g: 10$ {74,75,99}, {98,99,100} 100+1g: not a light {99,100,101} letters 10/12
- 11. Boundary value analyze Example: we test module for HR, which determines to hire the candidate or not, based on the age of the candidate: • 0-16 (Do not Hire); 16-18 • (Can hire only part time ); • 18-55 (Can hire on full time); • 55-99(Do not Hire) Equivalance classes: Boundary Values 0-15: Do not Hire {-1, 0, 1}, {14, 15, 16}, 16-17: Can hire only part time {17, 18, 19}, 18-54: Can hire on full time {54, 55, 56}, 55-99: Do not Hire {98, 99, 100} 11/12
- 12. Thank you for your attention! 12/12