Use Cases and Practical Examples of Boundary Value Analysis Technique

Boundary Value Analysis is often applied in scenarios where inputs fall within defined limits, such as numerical fields, date ranges, or selectable options. The technique focuses on testing the edges of these limits to ensure systems handle boundary conditions properly.

Common Use Cases:

1. Form Validation: In fields like password length, where a form accepts passwords between 8 to 20 characters, test cases would include passwords with 7, 8, 20, and 21 characters. This ensures the form behaves correctly with edge values.

2. Numeric Input Ranges: For input fields accepting a range of numbers, BVA ensures that inputs at, just below, and just above the limits are correctly processed. For example, a field accepting ages from 18 to 60 should be tested with 17, 18, 60, and 61.

3. Date Ranges: In applications where dates are used, BVA can be applied to test valid and invalid date ranges. For instance, if an application accepts dates within the year 2023, test cases would include December 31, 2022, January 1, 2023, December 31, 2023, and January 1, 2024.

Practical Example: Consider a system that accepts integers from 1 to 100:

• Test cases:

  • Lower boundary: 0, 1, 2

  • Upper boundary: 99, 100, 101 This covers both valid and invalid boundaries to ensure the system behaves correctly.

Conclusion

This technique helps testers to focus on edge cases where errors are more likely to occur. By testing the boundaries of input ranges, teams can detect issues that might be missed when testing within normal ranges.