Boundary Value Analysis

Runs in browser Test Design

A detailed BVA worksheet: define partitions, choose 2-value or 3-value BVA, and get a test table with expected pass/fail for every boundary.

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How to use Boundary Value Analysis

  1. Define the partitions as fields with min= and max= limits.
  2. Select 2-value or 3-value BVA.
  3. Analyze to get the worksheet, the summary counts and the test cases.

Boundary Value Analysis features

  • Worksheet combining equivalence classes with every boundary per field
  • 2-value or 3-value BVA following the ISTQB definitions
  • Expected pass/fail per boundary and numbered test cases
  • Handles integers, decimals, string lengths, list sizes, file sizes and date ranges
  • Export as Markdown, JSON, CSV or Gherkin

Boundary Value Analysis example

Worksheet for a quantity field

Input:

quantity: integer, min=1, max=10

Output:

quantity  Below minimum (min − 1)   0    Fail (rejected)
quantity  Minimum (min)             1    Pass (accepted)
quantity  Just above minimum        2    Pass (accepted)
quantity  Nominal (mid-range)       6    Pass (accepted)
quantity  Just below maximum        9    Pass (accepted)
quantity  Maximum (max)             10   Pass (accepted)
quantity  Above maximum (max + 1)   11   Fail (rejected)

Frequently asked questions about Boundary Value Analysis

2-value or 3-value BVA — which should I use?

2-value BVA (ISTQB default) tests each boundary and its nearest invalid neighbour. 3-value BVA adds the valid neighbour on the inside and catches more off-by-one mistakes; choose it for high-risk inputs.

What does the worksheet show?

For each field: the valid and invalid equivalence classes, every boundary, the exact test value and whether it should pass or fail, plus a numbered test case per boundary.

Are open ranges handled?

A field with only min or only max gets boundaries on that side; a field with neither gets zero, negative, large and beyond-safe-integer probes.

Can I export the worksheet?

Yes — the worksheet table downloads as CSV, and the test cases export as Markdown, JSON, CSV or Gherkin.