Add a few dacpac extension tests (#10322)

* add controller test

* Add a few wizard tests

* Addressing comment

* fix compile error

extensions/dacpac/src/test/mainController.test.ts

@@ -0,0 +1,27 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+import * as should from 'should';
+import MainController from '../controllers/mainController';
+import { TestContext, createContext } from './testContext';
+
+let testContext: TestContext;
+
+function createController(): MainController {
+	let controller = new MainController(testContext.context);
+	return controller;
+}
+
+describe('MainController', function (): void {
+	before(async function (): Promise<void> {
+		testContext = createContext();
+	});
+
+	it('Should create new instance successfully', async function (): Promise<void> {
+		let controller: MainController;
+		should.doesNotThrow(() => controller = createController());
+		should.notEqual(controller.extensionContext, undefined);
+	});
+
+});