testing

Set up E2E test framework for Android using WebdriverIO, Appium, and
UiAutomator2. Add testID props to key components (AuthButton, BaseButton,
ChatBubble, CustomTextInput, ProposedEventCard) and apply testIDs to
login screen, chat screen, tab bar, and settings. Include initial tests
for app launch detection and login flow validation. Update CLAUDE.md
with E2E docs.

.drone.yml

@@ -1,6 +1,6 @@
 kind: pipeline
 type: docker
-name: server_build_and_test
+name: test_s3_upload
 
 trigger:
   branch:
@@ -9,84 +9,23 @@ trigger:
     - push
 
 steps:
-  - name: build_server
-    image: node
+  - name: create_dummy
+    image: alpine
     commands:
-      - npm ci -w @calchat/shared
-      - npm ci -w @calchat/server
-      - npm run build -w @calchat/server
+      - echo "test" > apps/client/calchat.apk
 
-  - name: jest_server
-    image: node
-    commands:
-      - npm run test -w @calchat/server
-
----
-
-kind: pipeline
-type: docker
-name: check_for_formatting
-
-trigger:
-  branch:
-    - main
-  event:
-    - push
-
-steps:
-  - name: format_check
-    image: node
-    commands:
-      - npm ci
-      - npm run check_format
-
----
-
-kind: pipeline
-type: docker
-name: deploy_latest
-
-trigger:
-  branch:
-    - main
-  event:
-    - push
-
-steps:
-  - name: upload_latest
-    image: plugins/docker
+  - name: upload_apk
+    image: plugins/s3
     settings:
-      registry: gitea.gilmour109.de
-      repo: gitea.gilmour109.de/gilmour109/calchat-server
-      dockerfile: apps/server/docker/Dockerfile
-      tags:
-        - latest
-      username:
-        from_secret: gitea_username
-      password:
-        from_secret: gitea_password
-
-  - name: deploy_to_vps
-    image: appleboy/drone-ssh
-    settings:
-      host:
-        - 10.0.0.1
-      username: root
-      password:
-        from_secret: vps_ssh_password
-      envs:
-        - gitea_username
-        - gitea_password
-      port: 22
-      command_timeout: 2m
-      script:
-        - docker login -u $GITEA_USERNAME -p $GITEA_PASSWORD gitea.gilmour109.de
-        - docker pull gitea.gilmour109.de/gilmour109/calchat-server:latest
-        - docker compose -f /root/calchat-mongo/docker-compose.yml up -d
-
-depends_on:
-  - server_build_and_test
-  - check_for_formatting
+      endpoint: https://garage.gilmour109.de
+      bucket: calchat-releases
+      access_key:
+        from_secret: calchat_drone_garage_access_key
+      secret_key:
+        from_secret: calchat_drone_garage_secret_key
+      source: apps/client/calchat.apk
+      target: /
+      path_style: true
 
 ---
 
@@ -122,50 +61,31 @@ steps:
         from_secret: k3s_ssh_password
       envs:
         - drone_tag
+        - drone_commit_sha
       port: 22
-      command_timeout: 2m
+      command_timeout: 10m
       script:
         - export TAG=$DRONE_TAG
         - export NAME=$(echo $DRONE_TAG | tr -d '.')
+        - export COMMIT=$DRONE_COMMIT_SHA
         - envsubst < /home/debian/manifest.yml | sudo kubectl apply -f -
 
----
+  - name: build_apk
+    image: gitea.gilmour109.de/gilmour109/eas-build:latest
+    environment:
+      EXPO_TOKEN:
+        from_secret: expo_token
+    commands:
+      - npm ci
+      - npm run build -w @calchat/shared
+      - npm run -w @calchat/client build:apk
 
-kind: pipeline
-type: docker
-name: upload_commit
-
-trigger:
-  event:
-    - promote
-
-steps:
-  - name: upload_commit
-    image: plugins/docker
+  - name: release_apk
+    image: plugins/gitea-release
     settings:
-      registry: gitea.gilmour109.de
-      repo: gitea.gilmour109.de/gilmour109/calchat-server
-      dockerfile: apps/server/docker/Dockerfile
-      tags:
-        - ${DRONE_COMMIT_SHA:0:8}
-      username:
-        from_secret: gitea_username
-      password:
-        from_secret: gitea_password
-
-  - name: deploy_to_k3s
-    image: appleboy/drone-ssh
-    settings:
-      host:
-        - 192.168.178.201
-      username: debian
-      password:
-        from_secret: k3s_ssh_password
-      envs:
-        - drone_commit_sha
-      port: 22
-      command_timeout: 2m
-      script:
-        - export TAG=$(echo $DRONE_COMMIT_SHA | cut -c1-8)
-        - export NAME=$TAG
-        - envsubst < /home/debian/manifest.yml | sudo kubectl apply -f -
+      api_key:
+        from_secret: gitea_token
+      base_url: https://gitea.gilmour109.de
+      files:
+        - calchat.apk
+      title: ${DRONE_TAG}

CLAUDE.md

@@ -25,6 +25,7 @@ npm run ios -w @calchat/client          # Start on iOS
 npm run web -w @calchat/client          # Start web version
 npm run lint -w @calchat/client         # Run ESLint
 npm run build:apk -w @calchat/client    # Build APK locally with EAS
+npm run test:e2e -w @calchat/client     # Run E2E tests (requires Appium server running)
 ```
 
 ### Shared (packages/shared)
@@ -61,8 +62,10 @@ npm run test -w @calchat/server         # Run Jest unit tests
 | | tsdav | CalDAV client library |
 | | ical.js | iCalendar parsing/generation |
 | Testing | Jest / ts-jest | Server unit tests |
+| | WebdriverIO + Appium | E2E tests (Android) |
+| | UiAutomator2 | Android UI automation driver |
 | Deployment | Docker | Server containerization (multi-stage build) |
-| | Drone CI | CI/CD pipelines (build, test, format check, deploy) |
+| | Drone CI | CI/CD pipelines (build, test, format check, deploy, APK build + Gitea release) |
 | Planned | iCalendar | Event export/import |
 
 ## Architecture
@@ -132,6 +135,19 @@ src/
 │   └── ThemeStore.ts           # theme, setTheme() - reactive theme switching with Zustand
 └── hooks/
     └── useDropdownPosition.ts  # Hook for positioning dropdowns relative to trigger element
+e2e/                            # E2E tests (WebdriverIO + Appium)
+├── jest.config.ts              # Jest config (ts-jest, 120s timeout)
+├── tsconfig.json               # TypeScript config (ES2020, CommonJS)
+├── .env                        # Test credentials, device name, Appium host/port
+├── config/
+│   └── capabilities.ts         # Appium capabilities (Dev Client vs APK mode)
+├── helpers/
+│   ├── driver.ts               # WebdriverIO driver singleton (init, get, quit)
+│   ├── selectors.ts            # testID constants for all screens
+│   └── utils.ts                # Helpers (waitForTestId, performLogin, ensureLoggedIn, ensureOnLoginScreen)
+└── tests/
+    ├── 01-app-launch.test.ts   # App startup & screen detection
+    └── 02-login.test.ts        # Login flow (empty fields, invalid creds, success)
 ```
 
 **Routing:** Tab-based navigation with Chat, Calendar, and Settings as main screens. Auth screens (login, register) outside tabs. Dynamic routes for event detail and note editing.
@@ -672,6 +688,13 @@ NODE_ENV=development        # development = pretty logs, production = JSON
   - **Chat mode**: Edit AI-proposed events before confirming - updates ChatStore locally and persists to server via ChatService.updateProposalEvent()
   - Route params: `mode` ('calendar' | 'chat'), `id?`, `date?`, `eventData?` (JSON), `proposalContext?` (JSON with messageId, proposalId, conversationId)
   - Supports recurring events with RRULE configuration (daily/weekly/monthly/yearly)
+- **E2E testing infrastructure:**
+  - WebdriverIO + Appium with UiAutomator2 driver for Android
+  - testID props added to key components (`AuthButton`, `BaseButton`, `ChatBubble`, `CustomTextInput`, `ProposedEventCard`)
+  - testIDs applied to login screen, chat screen, tab bar, settings logout button, and event proposal buttons
+  - `app.json`: `usesCleartextTraffic: true` for Android (allows HTTP connections needed by Appium)
+  - Two execution modes: Dev Client (local) and APK (CI)
+  - Tests: app launch detection, login flow validation (empty fields, invalid creds, success)
 
 ## Building
 
@@ -684,8 +707,9 @@ This uses the `preview` profile from `eas.json` which builds an APK with:
 - `arm64-v8a` architecture only (smaller APK size)
 - No credentials required (`withoutCredentials: true`)
 - Internal distribution
+- Non-interactive mode with fixed output path (`calchat.apk`) for CI compatibility
 
-**Requirements:** Android SDK and Java must be installed locally.
+**Requirements:** Android SDK and Java must be installed locally. In CI, the `eas-build` Docker image (`gitea.gilmour109.de/gilmour109/eas-build:latest`) provides the build environment with `EXPO_TOKEN` for authentication.
 
 **EAS Configuration:** `apps/client/eas.json` contains build profiles:
 - `development`: Development client with internal distribution
@@ -703,22 +727,59 @@ The project uses Drone CI (`.drone.yml`) with five pipelines:
 **On push to main:**
 1. **`server_build_and_test`**: Builds the server (`npm ci` + `npm run build`) and runs Jest tests (`npm run test`)
 2. **`check_for_formatting`**: Checks Prettier formatting across all workspaces (`npm run check_format`)
-3. **`deploy_latest`**: Builds Docker image, pushes to Gitea Container Registry (`gitea.gilmour109.de/gilmour109/calchat-server:latest`), then SSHs into VPS (`10.0.0.1`) to pull and restart via `docker compose`. Depends on both pipelines above passing first.
+3. **`deploy_latest`**: Builds Docker image, pushes to Gitea Container Registry (`gitea.gilmour109.de/gilmour109/calchat-server:latest`), then SSHs into VPS (`10.0.0.1`) to pull and restart via `docker compose`. Builds APK via `eas-build` Docker image and creates a Gitea release (title "latest") with the APK. Depends on both pipelines above passing first.
 
 **On tag:**
-4. **`upload_tag`**: Builds Docker image tagged with the git tag (`${DRONE_TAG}`), pushes to registry, then deploys to k3s cluster (`192.168.178.201`) via SSH using `envsubst` with a Kubernetes manifest template.
+4. **`upload_tag`**: Builds Docker image tagged with the git tag (`${DRONE_TAG}`), pushes to registry, then deploys to k3s cluster (`192.168.178.201`) via SSH using `envsubst` with a Kubernetes manifest template. Builds APK and creates a Gitea release tagged with `${DRONE_TAG}`.
 
 **On promote:**
-5. **`upload_commit`**: Builds Docker image tagged with short commit SHA (first 8 chars), pushes to registry, then deploys to k3s cluster (`192.168.178.201`) via SSH using `envsubst` with a Kubernetes manifest template.
+5. **`upload_commit`**: Builds Docker image tagged with short commit SHA (first 8 chars), pushes to registry, then deploys to k3s cluster (`192.168.178.201`) via SSH using `envsubst` with a Kubernetes manifest template. Builds APK and creates a Gitea release tagged with the short commit SHA.
 
 ## Testing
 
-Server uses Jest with ts-jest for unit testing. Config in `apps/server/jest.config.js` ignores `/node_modules/` and `/dist/`.
+### Server Unit Tests
+
+Jest with ts-jest for unit testing. Config in `apps/server/jest.config.js` ignores `/node_modules/` and `/dist/`.
 
 **Existing tests:**
 - `src/utils/password.test.ts` - Tests for bcrypt hash() and compare()
 - `src/utils/recurrenceExpander.test.ts` - Tests for expandRecurringEvents() (non-recurring, weekly/daily/UNTIL recurrence, EXDATE filtering, RRULE: prefix stripping, invalid RRULE fallback, multi-day events, sorting)
 
+### E2E Tests (Client)
+
+WebdriverIO + Appium for Android E2E testing. Tests run sequentially (`--runInBand`) sharing a singleton Appium driver.
+
+**Two execution modes:**
+- **Dev Client mode** (local): Connects to running Expo app (`host.exp.exponent`), `noReset: true`
+- **APK mode** (CI): Installs APK via `APK_PATH` env var, `noReset: false`
+
+**Running locally:**
+```bash
+# Terminal 1: Start Appium server
+appium
+# Terminal 2: Start Expo dev server on Android emulator
+npm run android -w @calchat/client
+# Terminal 3: Run E2E tests
+npm run test:e2e -w @calchat/client
+```
+
+**Environment variables** (`apps/client/e2e/.env`):
+```
+TEST_USER=test              # Login credentials for tests
+TEST_PASSWORD=test
+DEVICE_NAME=emulator-5554   # Android device/emulator
+APPIUM_HOST=localhost
+APPIUM_PORT=4723
+```
+
+**Element selection:** Uses Android UiAutomator2 with `resource-id` selectors (React Native maps `testID` → `resource-id` on Android).
+
+**testID conventions:** Components with testID support: `AuthButton`, `BaseButton`, `ChatBubble`, `CustomTextInput`, `ProposedEventCard`. Key testIDs: `login-title`, `login-identifier-input`, `login-password-input`, `login-button`, `login-error-text`, `tab-chat`, `tab-calendar`, `tab-settings`, `chat-message-input`, `chat-send-button`, `chat-bubble-left`, `chat-bubble-right`, `settings-logout-button`, `event-accept-button`, `event-reject-button`.
+
+**Existing E2E tests:**
+- `01-app-launch.test.ts` - App startup, detects login or auto-logged-in state
+- `02-login.test.ts` - Empty field validation, invalid credentials error, successful login
+
 ## Documentation
 
 Detailed architecture diagrams are in `docs/`:

apps/client/app.json

@@ -14,7 +14,8 @@
     "android": {
       "package": "com.gilmour109.calchat",
       "edgeToEdgeEnabled": true,
-      "predictiveBackGestureEnabled": false
+      "predictiveBackGestureEnabled": false,
+      "usesCleartextTraffic": true
     },
     "web": {
       "output": "static",

apps/client/e2e/config/capabilities.ts

@@ -0,0 +1,49 @@
+export type AppiumCapabilities = Record<string, unknown>;
+
+const COMMON_CAPABILITIES: AppiumCapabilities = {
+  platformName: "Android",
+  "appium:automationName": "UiAutomator2",
+  "appium:deviceName": process.env.DEVICE_NAME || "emulator-5554",
+  "appium:autoGrantPermissions": true,
+  "appium:newCommandTimeout": 300,
+};
+
+/**
+ * Dev Client mode: app is already installed via `expo start --android`.
+ * Appium connects to the running app without reinstalling.
+ */
+const DEV_CLIENT_CAPABILITIES: AppiumCapabilities = {
+  ...COMMON_CAPABILITIES,
+  "appium:appPackage": "host.exp.exponent",
+  "appium:appActivity": ".experience.ExperienceActivity",
+  "appium:noReset": true,
+};
+
+/**
+ * APK mode: Appium installs the APK directly.
+ * Used in CI where the APK is built via `eas build --profile e2e`.
+ */
+function getApkCapabilities(apkPath: string): AppiumCapabilities {
+  return {
+    ...COMMON_CAPABILITIES,
+    "appium:app": apkPath,
+    "appium:noReset": false,
+  };
+}
+
+/**
+ * Returns the appropriate capabilities based on the APK_PATH env variable.
+ * - APK_PATH set → APK mode (CI)
+ * - APK_PATH not set → Dev Client mode (local development)
+ */
+export function getCapabilities(): AppiumCapabilities {
+  const apkPath = process.env.APK_PATH;
+
+  if (apkPath) {
+    console.log(`[Appium] APK mode: ${apkPath}`);
+    return getApkCapabilities(apkPath);
+  }
+
+  console.log("[Appium] Dev Client mode");
+  return DEV_CLIENT_CAPABILITIES;
+}

apps/client/e2e/helpers/driver.ts

@@ -0,0 +1,41 @@
+import { remote, type Browser } from "webdriverio";
+import { getCapabilities } from "../config/capabilities";
+
+let driver: Browser | null = null;
+
+const APPIUM_HOST = process.env.APPIUM_HOST || "localhost";
+const APPIUM_PORT = parseInt(process.env.APPIUM_PORT || "4723", 10);
+
+/**
+ * Initialize the Appium driver. If already initialized, returns the existing instance.
+ * With --runInBand, all test files share this singleton.
+ */
+export async function initDriver(): Promise<Browser> {
+  if (driver) return driver;
+
+  const capabilities = getCapabilities();
+
+  driver = await remote({
+    hostname: APPIUM_HOST,
+    port: APPIUM_PORT,
+    path: "/",
+    capabilities,
+    logLevel: "warn",
+  });
+
+  return driver;
+}
+
+export function getDriver(): Browser {
+  if (!driver) {
+    throw new Error("Driver not initialized. Call initDriver() first.");
+  }
+  return driver;
+}
+
+export async function quitDriver(): Promise<void> {
+  if (driver) {
+    await driver.deleteSession();
+    driver = null;
+  }
+}

apps/client/e2e/helpers/selectors.ts

@@ -0,0 +1,30 @@
+/**
+ * All testID strings used in the CalChat app.
+ * Appium finds them via accessibility id selector: `~testId`
+ */
+export const TestIDs = {
+  // Login screen
+  LOGIN_TITLE: "login-title",
+  LOGIN_ERROR_TEXT: "login-error-text",
+  LOGIN_IDENTIFIER_INPUT: "login-identifier-input",
+  LOGIN_PASSWORD_INPUT: "login-password-input",
+  LOGIN_BUTTON: "login-button",
+
+  // Tab navigation
+  TAB_CHAT: "tab-chat",
+  TAB_CALENDAR: "tab-calendar",
+  TAB_SETTINGS: "tab-settings",
+
+  // Chat screen
+  CHAT_MESSAGE_INPUT: "chat-message-input",
+  CHAT_SEND_BUTTON: "chat-send-button",
+  CHAT_BUBBLE_LEFT: "chat-bubble-left",
+  CHAT_BUBBLE_RIGHT: "chat-bubble-right",
+
+  // Settings screen
+  SETTINGS_LOGOUT_BUTTON: "settings-logout-button",
+
+  // Event proposal
+  EVENT_ACCEPT_BUTTON: "event-accept-button",
+  EVENT_REJECT_BUTTON: "event-reject-button",
+} as const;

apps/client/e2e/helpers/utils.ts

@@ -0,0 +1,105 @@
+import type { Browser } from "webdriverio";
+import { TestIDs } from "./selectors";
+
+const DEFAULT_TIMEOUT = 15_000;
+
+/**
+ * Build a UiAutomator selector for a resource-id.
+ * React Native on Android maps testID to resource-id (not content-desc).
+ */
+function byTestId(testId: string): string {
+  return `android=new UiSelector().resourceId("${testId}")`;
+}
+
+/**
+ * Wait for an element with the given testID to exist and be displayed.
+ */
+export async function waitForTestId(
+  driver: Browser,
+  testId: string,
+  timeout = DEFAULT_TIMEOUT,
+) {
+  const element = driver.$(byTestId(testId));
+  await element.waitForDisplayed({ timeout });
+  return element;
+}
+
+/**
+ * Check if an element with the given testID is currently visible.
+ */
+export async function isTestIdVisible(
+  driver: Browser,
+  testId: string,
+): Promise<boolean> {
+  try {
+    const element = driver.$(byTestId(testId));
+    return await element.isDisplayed();
+  } catch {
+    return false;
+  }
+}
+
+/**
+ * Navigate to the login screen. If already logged in (auto-login),
+ * go to Settings and tap Logout first.
+ */
+export async function ensureOnLoginScreen(driver: Browser): Promise<void> {
+  const onLogin = await isTestIdVisible(driver, TestIDs.LOGIN_TITLE);
+  if (onLogin) return;
+
+  // We're on the main app — navigate to Settings and logout
+  const settingsTab = driver.$(byTestId(TestIDs.TAB_SETTINGS));
+  await settingsTab.waitForDisplayed({ timeout: DEFAULT_TIMEOUT });
+  await settingsTab.click();
+
+  const logoutButton = await waitForTestId(
+    driver,
+    TestIDs.SETTINGS_LOGOUT_BUTTON,
+  );
+  await logoutButton.click();
+
+  // Wait for login screen to appear
+  await waitForTestId(driver, TestIDs.LOGIN_TITLE);
+}
+
+/**
+ * Perform login with the given credentials.
+ */
+export async function performLogin(
+  driver: Browser,
+  identifier: string,
+  password: string,
+): Promise<void> {
+  const identifierInput = await waitForTestId(
+    driver,
+    TestIDs.LOGIN_IDENTIFIER_INPUT,
+  );
+  await identifierInput.clearValue();
+  await identifierInput.setValue(identifier);
+
+  const passwordInput = await waitForTestId(
+    driver,
+    TestIDs.LOGIN_PASSWORD_INPUT,
+  );
+  await passwordInput.clearValue();
+  await passwordInput.setValue(password);
+
+  const loginButton = await waitForTestId(driver, TestIDs.LOGIN_BUTTON);
+  await loginButton.click();
+}
+
+/**
+ * Ensure the user is logged in. If on the login screen, perform login
+ * with test credentials.
+ */
+export async function ensureLoggedIn(driver: Browser): Promise<void> {
+  const testUser = process.env.TEST_USER || "test";
+  const testPassword = process.env.TEST_PASSWORD || "test";
+
+  const onLogin = await isTestIdVisible(driver, TestIDs.LOGIN_TITLE);
+  if (onLogin) {
+    await performLogin(driver, testUser, testPassword);
+    // Wait for chat screen to appear after login
+    await waitForTestId(driver, TestIDs.CHAT_MESSAGE_INPUT, 30_000);
+  }
+}

apps/client/e2e/jest.config.ts

@@ -0,0 +1,14 @@
+import type { Config } from "jest";
+
+const config: Config = {
+  preset: "ts-jest",
+  testEnvironment: "node",
+  testMatch: ["<rootDir>/tests/**/*.test.ts"],
+  testTimeout: 120_000,
+  transform: {
+    "^.+\\.ts$": "ts-jest",
+  },
+  moduleFileExtensions: ["ts", "js", "json"],
+};
+
+export default config;

apps/client/e2e/tests/01-app-launch.test.ts

@@ -0,0 +1,49 @@
+import { initDriver, getDriver } from "../helpers/driver";
+import { TestIDs } from "../helpers/selectors";
+import { waitForTestId } from "../helpers/utils";
+
+describe("App Launch", () => {
+  beforeAll(async () => {
+    await initDriver();
+    const driver = getDriver();
+
+    // Dismiss Expo Go banner by tapping near the top of the screen
+    await driver.pause(3000);
+    const { width } = await driver.getWindowSize();
+    await driver.touchAction({ action: "tap", x: Math.round(width / 2), y: 100 });
+    await driver.pause(500);
+  });
+
+  it("should launch the app and show login or chat screen", async () => {
+    const driver = getDriver();
+
+    // Wait for either the login screen or the chat screen to appear
+    // Try login first with a long timeout (app needs to fully load)
+    try {
+      await waitForTestId(driver, TestIDs.LOGIN_TITLE, 30_000);
+      // On login screen — verify elements
+      const identifierInput = await waitForTestId(
+        driver,
+        TestIDs.LOGIN_IDENTIFIER_INPUT,
+      );
+      expect(await identifierInput.isDisplayed()).toBe(true);
+
+      const passwordInput = await waitForTestId(
+        driver,
+        TestIDs.LOGIN_PASSWORD_INPUT,
+      );
+      expect(await passwordInput.isDisplayed()).toBe(true);
+
+      const loginButton = await waitForTestId(driver, TestIDs.LOGIN_BUTTON);
+      expect(await loginButton.isDisplayed()).toBe(true);
+    } catch {
+      // Not on login — should be on chat screen (auto-login)
+      const chatInput = await waitForTestId(
+        driver,
+        TestIDs.CHAT_MESSAGE_INPUT,
+        30_000,
+      );
+      expect(await chatInput.isDisplayed()).toBe(true);
+    }
+  });
+});

apps/client/e2e/tests/02-login.test.ts

@@ -0,0 +1,73 @@
+import { initDriver, getDriver, quitDriver } from "../helpers/driver";
+import { TestIDs } from "../helpers/selectors";
+import {
+  waitForTestId,
+  ensureOnLoginScreen,
+  performLogin,
+} from "../helpers/utils";
+
+describe("Login", () => {
+  beforeAll(async () => {
+    await initDriver();
+    const driver = getDriver();
+
+    // Dismiss Expo Go banner by tapping near the top of the screen
+    await driver.pause(3000);
+    const { width } = await driver.getWindowSize();
+    await driver.touchAction({ action: "tap", x: Math.round(width / 2), y: 100 });
+    await driver.pause(500);
+  });
+
+  beforeEach(async () => {
+    const driver = getDriver();
+    await ensureOnLoginScreen(driver);
+  });
+
+  it("should show error when fields are empty", async () => {
+    const driver = getDriver();
+
+    // Tap login without entering credentials
+    const loginButton = await waitForTestId(driver, TestIDs.LOGIN_BUTTON);
+    await loginButton.click();
+
+    // Error message should appear
+    const errorText = await waitForTestId(driver, TestIDs.LOGIN_ERROR_TEXT);
+    const text = await errorText.getText();
+    expect(text).toContain("Bitte alle Felder");
+  });
+
+  it("should show error for invalid credentials", async () => {
+    const driver = getDriver();
+
+    await performLogin(driver, "invalid_user", "wrong_password");
+
+    // Wait for error message
+    const errorText = await waitForTestId(
+      driver,
+      TestIDs.LOGIN_ERROR_TEXT,
+      30_000,
+    );
+    const text = await errorText.getText();
+    expect(text).toContain("Anmeldung fehlgeschlagen");
+  });
+
+  it("should login successfully with valid credentials", async () => {
+    const driver = getDriver();
+    const testUser = process.env.TEST_USER || "test";
+    const testPassword = process.env.TEST_PASSWORD || "test";
+
+    await performLogin(driver, testUser, testPassword);
+
+    // Chat screen should appear after successful login
+    const chatInput = await waitForTestId(
+      driver,
+      TestIDs.CHAT_MESSAGE_INPUT,
+      30_000,
+    );
+    expect(await chatInput.isDisplayed()).toBe(true);
+  });
+
+  afterAll(async () => {
+    await quitDriver();
+  });
+});

apps/client/e2e/tsconfig.json

@@ -0,0 +1,16 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "module": "commonjs",
+    "lib": ["ES2020"],
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true,
+    "outDir": "dist",
+    "rootDir": "."
+  },
+  "include": ["**/*.ts"],
+  "exclude": ["dist"]
+}

apps/client/package.json

@@ -9,7 +9,8 @@
     "ios": "expo start --ios",
     "web": "expo start --web",
     "lint": "expo lint",
-    "build:apk": "eas build --platform android --profile preview --local"
+    "build:apk": "eas build --platform android --profile preview --local --non-interactive --output ./calchat.apk",
+    "test:e2e": "NODE_OPTIONS=--experimental-vm-modules jest --config e2e/jest.config.ts --runInBand"
   },
   "dependencies": {
     "@calchat/shared": "*",
@@ -48,10 +49,17 @@
     "zustand": "^5.0.9"
   },
   "devDependencies": {
+    "@types/jest": "^29.5.14",
     "@types/react": "~19.1.0",
+    "appium": "^2.17.1",
+    "appium-uiautomator2-driver": "^3.8.0",
     "eslint-config-expo": "~10.0.0",
+    "jest": "^29.7.0",
     "prettier-plugin-tailwindcss": "^0.5.11",
-    "tailwindcss": "^3.4.17"
+    "tailwindcss": "^3.4.17",
+    "ts-jest": "^29.2.5",
+    "ts-node": "^10.9.2",
+    "webdriverio": "^9.14.2"
   },
   "private": true
 }

apps/client/src/app/(tabs)/_layout.tsx

@@ -19,6 +19,7 @@ export default function TabLayout() {
           name="chat"
           options={{
             title: "Chat",
+            tabBarTestID: "tab-chat",
             tabBarIcon: ({ color }) => (
               <Ionicons size={28} name="chatbubble" color={color} />
             ),
@@ -28,6 +29,7 @@ export default function TabLayout() {
           name="calendar"
           options={{
             title: "Calendar",
+            tabBarTestID: "tab-calendar",
             tabBarIcon: ({ color }) => (
               <Ionicons size={28} name="calendar" color={color} />
             ),
@@ -37,6 +39,7 @@ export default function TabLayout() {
           name="settings"
           options={{
             title: "Settings",
+            tabBarTestID: "tab-settings",
             tabBarIcon: ({ color }) => (
               <Ionicons size={28} name="settings" color={color} />
             ),

apps/client/src/app/(tabs)/chat.tsx

@@ -342,6 +342,7 @@ const ChatInput = ({ onSend }: ChatInputProps) => {
   return (
     <View className="flex flex-row w-full items-end my-2 px-2">
       <TextInput
+        testID="chat-message-input"
         className="flex-1 border border-solid rounded-2xl px-3 py-2 mr-2"
         style={{
           backgroundColor: theme.messageBorderBg,
@@ -356,7 +357,7 @@ const ChatInput = ({ onSend }: ChatInputProps) => {
         placeholderTextColor={theme.textMuted}
         multiline
       />
-      <Pressable onPress={handleSend}>
+      <Pressable testID="chat-send-button" onPress={handleSend}>
         <View
           className="w-10 h-10 rounded-full items-center justify-center"
           style={{
@@ -393,6 +394,7 @@ const ChatMessage = ({
   return (
     <ChatBubble
       side={side}
+      testID={`chat-bubble-${side}`}
       style={{
         maxWidth: "80%",
         minWidth: hasProposals ? "75%" : undefined,

apps/client/src/app/(tabs)/settings.tsx

@@ -20,6 +20,7 @@ const handleLogout = async () => {
 const SettingsButton = (props: BaseButtonProps) => {
   return (
     <BaseButton
+      testID={props.testID}
       onPress={props.onPress}
       solid={props.solid}
       className={"w-11/12"}
@@ -214,7 +215,7 @@ const Settings = () => {
     <BaseBackground>
       <SimpleHeader text="Settings" />
       <View className="flex items-center mt-4">
-        <SettingsButton onPress={handleLogout} solid={true}>
+        <SettingsButton testID="settings-logout-button" onPress={handleLogout} solid={true}>
           <Ionicons name="log-out-outline" size={24} color={theme.primeFg} />{" "}
           Logout
         </SettingsButton>

apps/client/src/app/login.tsx

@@ -45,6 +45,7 @@ const LoginScreen = () => {
     <BaseBackground>
       <View className="flex-1 justify-center items-center p-8">
         <Text
+          testID="login-title"
           className="text-3xl font-bold mb-8"
           style={{ color: theme.textPrimary }}
         >
@@ -53,6 +54,7 @@ const LoginScreen = () => {
 
         {error && (
           <Text
+            testID="login-error-text"
             className="mb-4 text-center"
             style={{ color: theme.rejectButton }}
           >
@@ -61,6 +63,7 @@ const LoginScreen = () => {
         )}
 
         <CustomTextInput
+          testID="login-identifier-input"
           placeholder="E-Mail oder Benutzername"
           placeholderTextColor={theme.textMuted}
           text={identifier}
@@ -70,6 +73,7 @@ const LoginScreen = () => {
         />
 
         <CustomTextInput
+          testID="login-password-input"
           placeholder="Passwort"
           placeholderTextColor={theme.textMuted}
           text={password}
@@ -79,6 +83,7 @@ const LoginScreen = () => {
         />
 
         <AuthButton
+          testID="login-button"
           title="Anmelden"
           onPress={handleLogin}
           isLoading={isLoading}

apps/client/src/components/AuthButton.tsx

@@ -5,12 +5,14 @@ interface AuthButtonProps {
   title: string;
   onPress: () => void;
   isLoading?: boolean;
+  testID?: string;
 }
 
-const AuthButton = ({ title, onPress, isLoading = false }: AuthButtonProps) => {
+const AuthButton = ({ title, onPress, isLoading = false, testID }: AuthButtonProps) => {
   const { theme } = useThemeStore();
   return (
     <Pressable
+      testID={testID}
       onPress={onPress}
       disabled={isLoading}
       className="w-full rounded-lg p-4 mb-4 border-4"

apps/client/src/components/BaseButton.tsx

@@ -7,6 +7,7 @@ export type BaseButtonProps = {
   className?: string;
   onPress: () => void;
   solid?: boolean;
+  testID?: string;
 };
 
 const BaseButton = ({
@@ -14,10 +15,12 @@ const BaseButton = ({
   children,
   onPress,
   solid = false,
+  testID,
 }: BaseButtonProps) => {
   const { theme } = useThemeStore();
   return (
     <Pressable
+      testID={testID}
       className={`rounded-lg p-4 mb-4 border-4 ${className}`}
       onPress={onPress}
       style={{

apps/client/src/components/ChatBubble.tsx

@@ -8,6 +8,7 @@ type ChatBubbleProps = {
   children: React.ReactNode;
   className?: string;
   style?: ViewStyle;
+  testID?: string;
 };
 
 export function ChatBubble({
@@ -15,6 +16,7 @@ export function ChatBubble({
   children,
   className = "",
   style,
+  testID,
 }: ChatBubbleProps) {
   const { theme } = useThemeStore();
   const borderColor = side === "left" ? theme.chatBot : theme.primeFg;
@@ -25,6 +27,7 @@ export function ChatBubble({
 
   return (
     <View
+      testID={testID}
       className={`border-2 border-solid rounded-xl my-2 ${sideClass} ${className}`}
       style={[
         { borderColor, elevation: 8, backgroundColor: theme.secondaryBg },

apps/client/src/components/CustomTextInput.tsx

@@ -13,6 +13,7 @@ export type CustomTextInputProps = {
   secureTextEntry?: boolean;
   autoCapitalize?: TextInputProps["autoCapitalize"];
   keyboardType?: TextInputProps["keyboardType"];
+  testID?: string;
 };
 
 const CustomTextInput = (props: CustomTextInputProps) => {
@@ -21,6 +22,7 @@ const CustomTextInput = (props: CustomTextInputProps) => {
 
   return (
     <TextInput
+      testID={props.testID}
       className={`border border-solid rounded-2xl ${props.className}`}
       onChangeText={props.onValueChange}
       value={props.text}

apps/client/src/components/ProposedEventCard.tsx

@@ -31,6 +31,7 @@ const ActionButtons = ({
   return (
     <View className="flex-row mt-3 gap-2">
       <Pressable
+        testID="event-accept-button"
         onPress={onConfirm}
         disabled={isDisabled}
         className="flex-1 py-2 rounded-lg items-center"
@@ -47,6 +48,7 @@ const ActionButtons = ({
         </Text>
       </Pressable>
       <Pressable
+        testID="event-reject-button"
         onPress={onReject}
         disabled={isDisabled}
         className="flex-1 py-2 rounded-lg items-center"

apps/server/src/app.ts

@@ -87,6 +87,14 @@ app.get("/health", (_, res) => {
   res.json({ status: "ok" });
 });
 
+// Version endpoint
+app.get("/version", (_, res) => {
+  res.json({
+    version: process.env.VERSION || "unknown",
+    commit: process.env.COMMIT || "unknown",
+  });
+});
+
 // AI Test endpoint (for development only)
 app.post("/api/ai/test", async (req, res) => {
   try {

packages/shared/package.json

@@ -9,7 +9,8 @@
     "./*": "./dist/*"
   },
   "scripts": {
-    "build": "tsc"
+    "build": "tsc",
+    "prepare": "tsc"
   },
   "dependencies": {
     "rrule": "^2.8.1"