# Singleton Pattern / Testability

> "singleton-pattern" (design-patterns-core layer) is traded against "Testability" (computation-core layer) — a principle cannot be scope-separated from a quality, metric, or cost it competes with; resolve by measuring "Testability" and choosing an explicit operating point.

Record: `tension:singleton-pattern-testability`
Kind: tension
Canonical: https://banes-lab.com/ontology/schema#tension-singleton-pattern-testability

## tensions-with

- [Singleton Pattern](https://banes-lab.com/records/arch/singleton-pattern.md)
- [Testability](https://banes-lab.com/records/arch/testability.md)