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# Decision: Testing Consolidation — `core:testing` Module

**Date:** 2026-03-11
**Status:** Implemented

## Context

Each KMP module independently declared scattered test dependencies (`junit`, `mockk`, `coroutines-test`, `turbine`), leading to version drift and duplicated test doubles across modules.

## Decision

Created `core:testing` as a lightweight shared module for test doubles, fakes, and utilities. It depends only on `core:model` and `core:repository` (no heavy deps like `core:database`). All modules declare `implementation(projects.core.testing)` in `commonTest` to get a unified test dependency set.

## Consequences

- **Single source** for test fakes (`FakeRadioController`, `FakeNodeRepository`, `TestDataFactory`)
- **Clean dependency graph** — `core:testing` is lightweight; heavy modules depend on it in test scope, not vice versa
- **No production leakage** — only declared in `commonTest`, never in release artifacts
- **Reduced maintenance** — updating test libraries touches one `build.gradle.kts`

See [`core/testing/README.md`](../../core/testing/README.md) for usage guide and API reference.