Refresh master with initial release/0.24 snapshot (#332)

* Initial port of release/0.24 source code

* Fix additional headers

* Fix a typo in launch.json

test/smoke/src/areas/extensions/extensions.test.ts

@@ -0,0 +1,36 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as assert from 'assert';
+import { SpectronApplication, Quality } from '../../spectron/application';
+
+describe('Extensions', () => {
+	before(function () {
+		this.app.suiteName = 'Extensions';
+	});
+
+	it(`install and activate vscode-smoketest-check extension`, async function () {
+		const app = this.app as SpectronApplication;
+
+		if (app.quality === Quality.Dev) {
+			this.skip();
+			return;
+		}
+
+		const extensionName = 'vscode-smoketest-check';
+		await app.workbench.extensions.openExtensionsViewlet();
+
+		const installed = await app.workbench.extensions.installExtension(extensionName);
+		assert.ok(installed);
+
+		await app.reload();
+		await app.workbench.extensions.waitForExtensionsViewlet();
+		await app.workbench.quickopen.runCommand('Smoke Test Check');
+
+		const statusbarText = await app.workbench.statusbar.getStatusbarTextByTitle('smoke test');
+		await app.screenCapturer.capture('Statusbar');
+		assert.equal(statusbarText, 'VS Code Smoke Test Check');
+	});
+});