pairwise-test-case-generator

Overview

When a function takes multiple inputs whose interactions matter, the naive test set is the Cartesian product: 4 roles × 4 tiers × 5 features × 6 locales = 480 tests. Most teams give up before authoring all 480 and end up with happy-path-only coverage that misses interaction bugs.

The fix is all-pairs (pairwise) testing - pick a smaller test set that covers every pair of input values across the full matrix. Empirically, 2-wise coverage finds the majority of interaction bugs at a fraction of the test count. ISTQB catalogues this technique as pairwise testing, "a black-box test technique in which test conditions are pairs of parameter-value pairs" (commonly also called all-pairs testing).