Add Android unit and UI tests with test dependencies

android/README.md

@@ -10,6 +10,7 @@ Android client for the BikeSetup backend. Built with Kotlin, Jetpack Compose, an
 - **DI**: Koin
 - **Networking**: Ktor client (OkHttp engine) with automatic cookie jar for session auth
 - **Serialization**: Kotlinx Serialization
+- **Testing**: JUnit, MockK, coroutine test utilities, Robolectric, Compose UI test APIs
 
 ## Project Structure
 
@@ -58,6 +59,11 @@ com.bikeloam.app/
    ./gradlew installDebug
    ```
 
+6. Run JVM unit tests:
+   ```bash
+   ./gradlew testDebugUnitTest
+   ```
+
 ## API Configuration
 
 The debug build points to `http://10.0.2.2:3000` (emulator localhost). For a physical device, update `BASE_URL` in `app/build.gradle.kts` to your machine's LAN IP (e.g., `http://192.168.1.x:3000`).
@@ -75,6 +81,30 @@ buildConfigField("String", "BASE_URL", "\"http://YOUR_IP:3000\"")
 - **Ride Reviews**: Submit post-ride reviews with 1–10 sliders and issue checkboxes.
 - **AI Recommendations**: Fetches setup recommendations from `/api/ai/recommend`.
 
+## Tests
+
+Unit tests live under `app/src/test/java/com/bikeloam/app/` and cover the repository, all ViewModels, network layer, and Compose screens:
+
+- `BikeRepositoryTest`
+- `NetworkClientTest`
+- `SplashViewModelTest`
+- `LoginViewModelTest`
+- `RegisterViewModelTest`
+- `HomeViewModelTest`
+- `BuildListViewModelTest`
+- `CreateBuildViewModelTest`
+- `BuildDetailViewModelTest`
+- `ReviewViewModelTest`
+- `RecommendationViewModelTest`
+- `LoginScreenTest` (Compose UI – Robolectric)
+- `HomeScreenTest` (Compose UI – Robolectric)
+
+Use `MainDispatcherRule` for coroutine dispatcher replacement in ViewModel tests. Run the full JVM suite with:
+
+```bash
+./gradlew testDebugUnitTest
+```
+
 ## Architecture Notes
 
 - **Session cookies** are handled automatically by Ktor's `HttpCookies` plugin.