S2 Testing payment software

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Lesson S2: Positive and negative tests per component, test cards, keys and simulators, known-answer tests, regression.

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See plans

The opening of the lesson

Why it matters

Payment software fails in expensive ways:

double charges;
lost reversals;
PINs that never verify;
batches that never balance.

Certification test plans check the expected paths, but most production incidents come from the unexpected ones. A good tester knows both, and builds tests that run every day, not only before certification.

In the full lesson

The concept
Step by step: building a known-answer test
A test plan skeleton
In the real world
Common mistakes
What to test

What module S2 covers →

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