Make sure ts extension has loaded before running on-enter tests

Fixes #101922

Also adds back a test that was incorrectly removed

extensions/typescript-language-features/src/test/onEnter.test.ts

@@ -28,6 +28,11 @@ const type = async (document: vscode.TextDocument, text: string): Promise<vscode
 };
 
 suite('OnEnter', () => {
+	setup(async () => {
+		// the tests make the assumption that language rules are registered
+		await vscode.extensions.getExtension('vscode.typescript-language-features')!.activate();
+	});
+
 	test('should indent after if block with braces', () => {
 		return withRandomFileEditor(`if (true) {${CURSOR}`, 'js', async (_editor, document) => {
 			await type(document, '\nx');
@@ -51,4 +56,15 @@ suite('OnEnter', () => {
 					`})`));
 		});
 	});
+
+	test('should indent after simple jsx tag with attributes', () => {
+		return withRandomFileEditor(`const a = <div onclick={bla}>${CURSOR}`, 'jsx', async (_editor, document) => {
+			await type(document, '\nx');
+			assert.strictEqual(
+				document.getText(),
+				joinLines(
+					`const a = <div onclick={bla}>`,
+					`    x`));
+		});
+	});
 });