fix getDeviceById to match exact name (#5657)

* fix getDeviceById to match exact name
fixes https://github.com/flutter/flutter/issues/5508

packages/flutter_tools/lib/src/device.dart

@@ -39,13 +39,14 @@ class DeviceManager {
   /// `null`.
   ///
   /// This does a case insentitive compare with `deviceId`.
-  Future<Device> getDeviceById(String deviceId) async {
+  Future<Device> getDeviceById(String deviceId, [List<Device> devices]) async {
     deviceId = deviceId.toLowerCase();
-    List<Device> devices = await getAllConnectedDevices();
+    devices ??= await getAllConnectedDevices();
     Device device = devices.firstWhere(
-      (Device device) => device.id.toLowerCase() == deviceId,
-      orElse: () => null
-    );
+        (Device device) =>
+            device.id.toLowerCase() == deviceId ||
+            device.name.toLowerCase() == deviceId,
+        orElse: () => null);
 
     if (device != null)
       return device;

packages/flutter_tools/test/device_test.dart

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'dart:async';
+
 import 'package:flutter_tools/src/device.dart';
 import 'package:test/test.dart';
 
@@ -15,5 +17,33 @@ void main() {
       List<Device> devices = await deviceManager.getDevices();
       expect(devices, isList);
     });
+
+    testUsingContext('getDeviceById', () async {
+      DeviceManager deviceManager = new DeviceManager();
+      _MockDevice device1 = new _MockDevice('Nexus 5', '0553790d0a4e726f');
+      _MockDevice device2 = new _MockDevice('Nexus 5X', '01abfc49119c410e');
+      _MockDevice device3 = new _MockDevice('iPod touch', '82564b38861a9a5');
+      List<Device> devices = <Device>[device1, device2, device3];
+
+      Future<Null> expectDevice(String id, Device expected) async {
+        expect(await deviceManager.getDeviceById(id, devices), expected);
+      }
+      expectDevice('01abfc49119c410e', device2);
+      expectDevice('Nexus 5X', device2);
+      expectDevice('0553790d0a4e726f', device1);
+      expectDevice('Nexus 5', device1);
+      expectDevice('0553790', device1);
+      expectDevice('Nexus', null);
+    });
   });
 }
+
+class _MockDevice extends Device {
+  @override
+  final String name;
+
+  _MockDevice(this.name, String id) : super(id);
+
+  @override
+  void noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
+}

packages/flutter_tools/test/src/context.dart

@@ -82,7 +82,7 @@ class MockDeviceManager implements DeviceManager {
   Future<List<Device>> getAllConnectedDevices() => new Future<List<Device>>.value(devices);
 
   @override
-  Future<Device> getDeviceById(String deviceId) {
+  Future<Device> getDeviceById(String deviceId, [List<Device> _]) {
     Device device = devices.firstWhere((Device device) => device.id == deviceId, orElse: () => null);
     return new Future<Device>.value(device);
   }