Answers
What is property-based testing?
In short
Property-based testing generates many input cases against a property your code is meant to hold, finding edge cases that example-based tests miss.
Short answer
Property-based testing generates many input cases against a property your code is meant to hold, finding edge cases that example-based tests miss.
What this actually means in practice
Tools (Hypothesis, fast-check, ScalaCheck, Hedgehog) generate inputs against a generator you define. Shrinking finds the smallest failing case automatically. It's especially powerful for parsers, serialisers and financial calculations.
The most common pitfall
Generators that produce inputs nothing like production data — wasted CPU, no real coverage.
What to do next
Pick one calculation-heavy function and write a property test before the next change.
Frequently asked questions
Does Forth Systems help with this?
Yes — Forth Systems works with banks, payment institutions, insurers and infrastructure operators on exactly this kind of work. Engagements start with a fixed-scope assessment so you see the shape before committing.
How experienced is the team?
Engagements are staffed by named, UK-based senior engineers — not a rotating offshore pool. References from the second line of comparable clients are available on request.
Where are you based?
Edinburgh-based, delivering UK-wide with onsite presence in London and across Scotland as required.
How fast can we start?
Most engagements start within 2-4 weeks of a signed SoW, faster where an existing supplier framework is in place.