Testing Strategy
Business logic is where bugs are most expensive. A bug in your discount calculation, insurance eligibility rule, or loan approval logic doesn't just throw an error—it silently gives the wrong answer, affecting real customers and real money. Decision table testing is a systematic technique for deriving test
Testing Strategy
Testing every combination of input parameters is mathematically impossible for most systems. Three boolean parameters create 8 combinations. Ten parameters with 3 values each create 59,049 combinations. A car has around 500 features with binary toggles—more combinations than atoms in the universe. Combinatorial testing solves this by using
API Testing
API testing benefits from the same systematic input analysis as any other testing, but the input space is more structured: path parameters, query parameters, headers, and request bodies — each with their own validation rules and boundary conditions. This post applies BVA and equivalence partitioning specifically to REST API inputs. The
Database Testing
Database testing has its own equivalence partition structure driven by database constraints, SQL semantics, and the specific behaviors of NULL, type boundaries, and referential integrity. This post covers how to apply BVA and EP to database layer testing specifically. Database Column Constraints as Partition Sources Every column constraint defines partitions:
Test Design
Boundary value analysis (BVA) isn't a single technique — it's a family of related methods with different coverage philosophies. The version you learned in your testing certification is probably 2-point BVA: test at the boundary and just inside it. But 3-point BVA, robust BVA, and
Black-Box Testing
Black-box testing has seven or eight primary techniques. Knowing each individually is useful. Knowing which to apply to which problem is the skill that makes tests actually effective. This guide maps test scenarios to the techniques that produce the highest-value test cases for each. The Techniques A brief
Testing
Testing every possible combination of input parameters is mathematically straightforward and practically impossible. A feature with 10 parameters, each taking 5 values, has 5¹⁰ = nearly 10 million combinations. No team tests that. But most bugs are not caused by exotic 10-way interactions — they are caused by pairs or triples