Alanren/integration test (#3657)

* add an extension for integration tests

* setup ads before running test

* test setup

* test cases

* bash script

* shorter temp folder name

* code cleanup

* add commented out original code

* fix test error

* test result path

* rename results file

* change file path

* report smoke test results

* test stablize

* test stablization and configurable test servers

* fix smoke test error

* connection provider

* simplify the integration test script

* add comment

* fix tslint error

* address PR comments

* add temp log to check whether the environment variable is already set

* remove temp log

* move api definition to testapi typing file

* exclude integration tests extension

* address comments

extensions/integration-tests/src/index.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 vscode from 'vscode';
+import { context } from './testContext';
+
+const path = require('path');
+const testRunner = require('vscode/lib/testrunner');
+
+const suite = 'Integration Tests';
+
+const options: any = {
+	ui: 'tdd',
+	useColors: true,
+	timeout: 600000
+};
+
+if (process.env.BUILD_ARTIFACTSTAGINGDIRECTORY) {
+	options.reporter = 'mocha-multi-reporters';
+	options.reporterOptions = {
+		reporterEnabled: 'spec, mocha-junit-reporter',
+		mochaJunitReporterReporterOptions: {
+			testsuitesTitle: `${suite} ${process.platform}`,
+			mochaFile: path.join(process.env.BUILD_ARTIFACTSTAGINGDIRECTORY, `test-results/${process.platform}-${suite.toLowerCase().replace(/[^\w]/g, '-')}-results.xml`)
+		}
+	};
+}
+
+if (!vscode.workspace.getConfiguration('test')['testSetupCompleted']) {
+	context.RunTest = false;
+}
+
+testRunner.configure(options);
+
+export = testRunner;