Add unit test for device utils (#432)

* Add unit test for device utils

* Update

src/server/device.js

@@ -191,5 +191,8 @@ function saveDefaultDeviceIdForPlatform(platform, deviceId) {
 
 module.exports = {
     getDeviceInfo: getDeviceInfo,
-    updateDeviceInfo: updateDeviceInfo
+    updateDeviceInfo: updateDeviceInfo,
+    getDefaultDevice: getDefaultDevice,
+    getDevice: getDevice,
+    getUserAgent: getUserAgent
 };

test/device.test.js

@@ -0,0 +1,46 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for details.
+
+const assert = require('assert');
+var Device = require('../src/server/device');
+
+suite('deviceUtils', function () {
+    test('Should get default device correctly for each platform', (done) => {
+        const defaultAndroidDevice = Device.getDefaultDevice('android');
+        assert.strictEqual('Nexus6', defaultAndroidDevice.id);
+        const defaultIosDevice = Device.getDefaultDevice('ios');
+        assert.strictEqual('iPhone12', defaultIosDevice.id);
+        const defaultWindowsDevice = Device.getDefaultDevice('windows');
+        assert.strictEqual('Lumia950', defaultWindowsDevice.id);
+        done();
+    });
+
+    test('Should get default device if the target device id is not existing in specific platform', (done) => {
+        const device = Device.getDevice('android', 'iPhone11');
+        assert.strictEqual('Nexus6', device.id);
+        done();
+    });
+
+    test('Should throw error message if no user agent found', (done) => {
+        const device = Device.getDevice('ios', 'iPhone12');
+        device['os-version'] = '1';
+        let error;
+        try {
+            Device.getUserAgent(device);
+        } catch (err) {
+            error = err.message;
+        }
+        assert.strictEqual('Cannot find user agent for device: iPhone 12, os-version: 1.', error);
+        done();
+    });
+
+    test('Should get device info correctly', (done) => {
+        const deviceInfo = Device.getDeviceInfo('ios', 'iPhone13');
+        assert.strictEqual(deviceInfo.deviceId, 'iPhone13');
+        assert.strictEqual(deviceInfo.platform, 'ios');
+        assert.strictEqual(Object.keys(deviceInfo.platformDevices).length != 0, true);
+        assert.strictEqual(deviceInfo.userAgent.includes('Mozilla') && deviceInfo.userAgent.includes('AppleWebKit'), true);
+        done();
+    });
+});
+