Some basic tests for AndroidDevice that don’t require a device to be attached.

packages/flutter_tools/test/android_device_test.dart

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+library android_device_test;
+
+import 'package:sky_tools/src/device.dart';
+import 'package:test/test.dart';
+
+main() => defineTests();
+
+defineTests() {
+  group('android_device', () {
+    test('uses the correct default ID', () {
+      AndroidDevice android = new AndroidDevice();
+      expect(android.id, equals(AndroidDevice.defaultDeviceID));
+    });
+
+    test('stores the requested id', () {
+      String deviceID = '1234';
+      AndroidDevice android = new AndroidDevice(deviceID);
+      expect(android.id, equals(deviceID));
+    });
+
+    test('correctly creates only one of each requested device id', () {
+      String deviceID = '1234';
+      AndroidDevice a1 = new AndroidDevice(deviceID);
+      AndroidDevice a2 = new AndroidDevice(deviceID);
+      expect(a1, equals(a2));
+    });
+  });
+}