First jests

src/FormCollection/Resources/assets/package.json

@@ -28,5 +28,11 @@
         "@babel/preset-env": "^7.12.7",
         "@symfony/stimulus-testing": "^1.1.0",
         "stimulus": "^2.0.0"
+    },
+    "jest": {
+        "testRegex": "test/.*\\.test.js",
+        "setupFilesAfterEnv": [
+            "./test/setup.js"
+        ]
     }
 }

src/FormCollection/Resources/assets/test/controller.test.js

@@ -0,0 +1,60 @@
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+'use strict';
+
+import { Application, Controller } from 'stimulus';
+import { getByTestId, waitFor } from '@testing-library/dom';
+import user from '@testing-library/user-event';
+import { clearDOM, mountDOM } from '@symfony/stimulus-testing';
+import FormCollectionController from '../dist/controller';
+
+// Controller used to check the actual controller was properly booted
+class CheckController extends Controller {
+    connect() {
+        this.element.addEventListener('form-collection:pre-connect', () => {
+            this.element.classList.add('pre-connected');
+        });
+        this.element.addEventListener('form-collection:connect', () => {
+            this.element.classList.add('connected');
+        });
+    }
+}
+
+const startStimulus = () => {
+    const application = Application.start();
+    application.register('check', CheckController);
+    application.register('formCollection', FormCollectionController);
+};
+
+describe('FormCollectionController', () => {
+    let container;
+
+    beforeEach(() => {
+        container = mountDOM(`
+            <div class="container" data-controller="check formCollection" data-testid="container"> 
+
+            </div>
+        `);
+    });
+
+    afterEach(() => {
+        clearDOM();
+    });
+
+    it('events', async () => {
+        expect(getByTestId(container, 'container')).not.toHaveClass('connected');
+        expect(getByTestId(container, 'container')).not.toHaveClass('pre-connected');
+
+        startStimulus();
+        await waitFor(() => expect(getByTestId(container, 'container')).toHaveClass('connected'));
+        await waitFor(() => expect(getByTestId(container, 'container')).toHaveClass('pre-connected'));
+    });
+
+});

src/FormCollection/Resources/assets/test/setup.js

@@ -0,0 +1,12 @@
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+'use strict';
+
+import '@symfony/stimulus-testing/setup';