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Beyond Testing

Correctness by Design

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What if tests were part of production code?

Most testing frameworks focus on catching bugs, but what if we could prevent them from the start? BeyondTesting.dev explores Design by Contract (DbC)—a methodology where software correctness is built-in, not patched later.

We believe in:

  • Self-verifying code with contracts
  • Fewer tests, more guarantees
  • Provably correct software by design

Here's how contracts automatically enforce correctness at runtime:

Diagram showing how Design by Contract enforces correctness: invariant checks before and after, with pre- and postconditions around the method body.

Each method call is surrounded by automatic checks:
Invariants ensure the object remains valid,
Preconditions verify input before the logic runs,
and Postconditions confirm the output and state after execution.