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Meshtastic-Android/docs/developer/testing.md

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---
title: Testing
nav_order: 7
last_updated: 2026-05-13
aliases:
- tests
- unit-tests
- screenshot-tests
---
# Testing
Testing strategy and practices for the Meshtastic KMP project.
## Test Categories
### KMP Unit Tests (`commonTest`)
Shared tests that run on all platforms:
```bash
./gradlew allTests
```
- Business logic tests
- Data model validation
- Search/ranking algorithm tests
- Route serialization tests
### Android Host Tests
Android-specific tests that run on JVM:
```bash
./gradlew test
```
- ViewModel tests
- Repository tests with Room fakes
- Android-specific integration tests
### Compose UI Tests
Compose Multiplatform UI test framework:
```kotlin
@Test
fun myScreenTest() = runComposeUiTest {
setContent { MyScreen() }
onNodeWithText("Expected").assertIsDisplayed()
}
```
Located in `commonTest` or `jvmTest` source sets.
### Screenshot Tests
Preferred: **Roborazzi** (Gradle-native, Ubuntu CI compatible)
Fallback: **Paparazzi** (Android-view-centric)
```bash
./gradlew recordDocsScreenshots # Record golden images
./gradlew verifyDocsScreenshots # Compare against goldens
```
## Test Organization
```
feature/my-feature/src/
├── commonTest/kotlin/org/meshtastic/feature/myfeature/
│ ├── MyBusinessLogicTest.kt
│ └── MyModelTest.kt
└── jvmTest/kotlin/org/meshtastic/feature/myfeature/
└── MyDesktopSpecificTest.kt
```
## Testing Guidelines
### DO
- Write tests in `commonTest` when possible (runs everywhere)
- Test business logic independently from UI
- Use fakes/stubs instead of mocks where practical
- Test edge cases: empty states, error states, boundary values
- Test deep link routing in `DeepLinkRouterTest`
- Keep tests fast — no network, no disk I/O in unit tests
### DON'T
- Don't test framework behavior (Compose internals, Room queries)
- Don't create tests that depend on other feature modules
- Don't use `Thread.sleep` — use coroutine test dispatchers
- Don't rely on test execution order
## Running Tests
```bash
# All KMP tests
./gradlew allTests
# Specific module
./gradlew :feature:docs:allTests
# Code quality
./gradlew spotlessCheck detekt
# Full verification
./gradlew spotlessCheck detekt kmpSmokeCompile test allTests
```
## CI Integration
Tests run automatically on:
- Pull request creation/update
- Push to `main`
- Pre-release validation
The CI workflow uses `ubuntu-24.04` with JDK 21 and Gradle caching.
---