test: Add e2e-tests (#1355)

Author: maxreichmann

.github/workflows/internal-e2e-tests.yml

@@ -0,0 +1,32 @@
+name: Internal E2E Tests
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: Internal E2E Tests
+    runs-on: ubuntu-24.04
+
+    steps:
+    - uses: actions/checkout@v6
+
+    - name: Setup Node.js
+      uses: actions/setup-node@v6
+      with:
+        node-version: 22.20.0
+
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Run e2e-tests
+      working-directory: internal/e2e-tests
+      run: npm run test

.gitignore

@@ -69,4 +69,7 @@ internal/documentation/.vitepress/cache
 internal/documentation/dist
 internal/documentation/schema/*
 internal/documentation/docs/api
-internal/documentation/tmp
+internal/documentation/tmp
+
+# E2E-tests
+internal/e2e-tests/tmp

internal/e2e-tests/README.md

@@ -0,0 +1,34 @@
+# E2E Tests for UI5 CLI
+
+End-to-end test environment for the UI5 CLI containing realistic user scenarios.
+
+## Usage
+
+```bash
+npm install
+npm run unit
+```
+
+## How It Works
+
+Tests are run with the **Node.js built-in test runner**. Each test:
+
+1. Copies a fixture project to a temporary directory (`./tmp`)
+2. Runs `npm install` there (child process)
+3. Runs `ui5 build` with varying configurations (child process)
+
+The UI5 CLI executables are sourced directly from this repository at `packages/cli/bin/ui5.cjs`.
+
+Some scenarios include multiple sequential builds with file modifications in between to simulate real-world development workflows. Node modules are getting installed on the fly for the first build and reused for subsequent builds (no reinstall).
+
+
+
+
+## Fixtures
+
+Located under `./fixtures/`:
+
+| Fixture | Description |
+|---|---|
+| `application.a` | Sample JavaScript project (controller + `manifest.json`) |
+| `application.a.ts` | Sample TypeScript project (based on [generator-ui5-ts-app](https://github.com/ui5-community/generator-ui5-ts-app)) |

internal/e2e-tests/eslint.config.js

@@ -0,0 +1,12 @@
+import eslintCommonConfig from "../../eslint.common.config.js";
+
+export default [
+	{
+		// Ignore test files and build output
+		ignores: [
+			"tmp/",
+			"fixtures/",
+		]
+	},
+	...eslintCommonConfig, // Load common ESLint config
+];