initial device definition test

test/Backend/device_definition_test.dart

@@ -0,0 +1,37 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:flutter_test/flutter_test.dart' as flTest;
+import 'package:tail_app/Backend/Bluetooth/bluetooth_manager.dart';
+import 'package:tail_app/Backend/Bluetooth/bluetooth_manager_plus.dart';
+import 'package:tail_app/Backend/Definitions/Device/device_definition.dart';
+import 'package:test/test.dart';
+
+import '../testing_utils/bluetooth_test_utils.dart';
+import '../testing_utils/gear_utils.dart';
+import '../testing_utils/hive_utils.dart';
+
+void main() {
+  setUp(() async {
+    flTest.TestWidgetsFlutterBinding.ensureInitialized();
+    await setupHive();
+  });
+  tearDown(() async {
+    await deleteHive();
+    isAnyGearConnected.value = false;
+  });
+  group('Stateful Device event listeners', () {
+    test('Battery Levels', () async {
+      setupBTMock('MiTail', 'TestMiTail');
+      ProviderContainer container = await testGearAdd('MiTail', gearMacPrefix: 'Test');
+      BaseStatefulDevice baseStatefulDevice = container.read(knownDevicesProvider).values.first;
+      expect(baseStatefulDevice.batteryLevel.value, -1);
+      expect(baseStatefulDevice.batlevels.isEmpty, true);
+      baseStatefulDevice.batteryLevel.value = 100;
+      expect(baseStatefulDevice.batteryLevel.value, 100);
+      expect(baseStatefulDevice.batlevels.length, 1);
+      expect(baseStatefulDevice.batlevels.first.y, 100);
+      baseStatefulDevice.reset();
+      expect(baseStatefulDevice.batteryLevel.value, -1);
+      expect(baseStatefulDevice.batlevels.isEmpty, true);
+    });
+  });
+}