Add tests for azdata extension (#11423)

* Add tests for azdata extension

* Fail on stderr

* Skip test for not implemented logic

* Move executeCommand stub

* Add missing packages

extensions/azdata/src/test/common/httpClient.test.ts

@@ -0,0 +1,63 @@
+/*---------------------------------------------------------------------------------------------
+ *  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 * as should from 'should';
+import * as TypeMoq from 'typemoq';
+import { HttpClient } from '../../common/httpClient';
+import * as path from 'path';
+import * as os from 'os';
+import * as fs from 'fs';
+import * as uuid from 'uuid';
+import * as nock from 'nock';
+import * as sinon from 'sinon';
+import { PassThrough } from 'stream';
+
+describe('HttpClient', function () {
+
+	let outputChannelMock: TypeMoq.IMock<vscode.OutputChannel>;
+
+	before(function (): void {
+		outputChannelMock = TypeMoq.Mock.ofType<vscode.OutputChannel>();
+	});
+
+	afterEach(function (): void {
+		nock.cleanAll();
+		nock.enableNetConnect();
+	});
+
+	it('downloads file successfully', async function (): Promise<void> {
+		const downloadPath = path.join(os.tmpdir(), `azdata-httpClientTest-${uuid.v4()}.txt`);
+		await HttpClient.download('https://raw.githubusercontent.com/microsoft/azuredatastudio/main/README.md', downloadPath, outputChannelMock.object);
+		// Verify file was downloaded correctly
+		await fs.promises.stat(downloadPath);
+	});
+
+	it('errors on response stream error', async function (): Promise<void> {
+		const downloadPath = path.join(os.tmpdir(), `azdata-httpClientTest-error-${uuid.v4()}.txt`);
+		nock('https://127.0.0.1')
+			.get('/')
+			.replyWithError('Unexpected Error');
+		const downloadPromise = HttpClient.download('https://127.0.0.1', downloadPath, outputChannelMock.object);
+
+		await should(downloadPromise).be.rejected();
+	});
+
+	it('errors on write stream error', async function (): Promise<void> {
+		const downloadPath = path.join(os.tmpdir(), `azdata-httpClientTest-error-${uuid.v4()}.txt`);
+		const mockWriteStream = new PassThrough();
+		sinon.stub(fs, 'createWriteStream').returns(<any>mockWriteStream);
+		nock('https://127.0.0.1')
+			.get('/')
+			.reply(200, '');
+		const downloadPromise = HttpClient.download('https://127.0.0.1', downloadPath, outputChannelMock.object);
+		try {
+			// Passthrough streams will throw the error we emit so just no-op and
+			// let the HttpClient handler handle the error
+			mockWriteStream.emit('error', 'Unexpected write error');
+		} catch (err) { }
+		await should(downloadPromise).be.rejected();
+	});
+});