# Fake at the Boundary

> A technique for replacing an external dependency in tests with a working in-memory implementation of its port.

Record: `lexicon:fake-at-the-boundary`
Kind: technique
Layer: [Computation Core](https://banes-lab.com/records/layer/computation-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-fake-at-the-boundary

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Test Observable Behavior](https://banes-lab.com/records/lexicon/test-observable-behavior.md) and before [Unit Tests](https://banes-lab.com/records/lexicon/unit-tests.md).

## Category

- [Correctness / Determinism / Verification](https://banes-lab.com/records/lexicon-category/correctness-determinism-verification.md)

## Refactors

- [Mock Mirage](https://banes-lab.com/records/architecture/mock-mirage.md)
- [Flaky Test Normalization](https://banes-lab.com/records/architecture/flaky-test-normalization.md)
- [Repeatability](https://banes-lab.com/records/architecture/repeatability.md)

## Linked from

- [Anti-patterns](https://banes-lab.com/ontology/principles/architecture-category-anti-patterns.md)
- [Correctness / Determinism / Verification](https://banes-lab.com/ontology/principles/architecture-category-correctness-determinism-verification.md)