Can you guarantee that a function has no bugs?

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  • fast-check

    Property based testing framework for JavaScript (like QuickCheck) written in TypeScript

    Basically what this test does is using fast-check to generate random integers (with fc.integer) which is then passed to our callback to make and assertion. And what can we assert it's always true when transferring money from Alice to Bob? What is a property of a transference? Here they both start with 10 pesos, so the property we check here is that no matter how much money is being transferred, Bob should always end up with more money than Alice. We also ignore any errors, as we are only interested in the successful transfers for now.

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