Feat (Auth): Integration Tests for fetchCurrentDevice API

packages/auth/amplify_auth_cognito/example/integration_test/device_tracking_test.dart

@@ -240,6 +240,45 @@ void main() {
         await expectLater(Amplify.Auth.rememberDevice(), completes);
       });
 
+      asyncTest('fetchCurrentDevice returns the current device', (_) async {
+        await expectLater(Amplify.Auth.fetchCurrentDevice(), completes);
+        final currentTestDevice = await Amplify.Auth.fetchCurrentDevice();
+        final currentDeviceKey = await getDeviceKey();
+        expect(currentDeviceKey, currentTestDevice.id);
+      });
+
+      asyncTest(
+          'The device from fetchCurrentDevice isnt equal to another device.',
+          (_) async {
+        final previousDeviceKey = await getDeviceKey();
+        await signOutUser();
+        await deleteDevice(cognitoUsername, previousDeviceKey!);
+        await signIn();
+        final newCurrentTestDevice = await Amplify.Auth.fetchCurrentDevice();
+        expect(newCurrentTestDevice.id, isNot(previousDeviceKey));
+      });
+
+      asyncTest(
+          'fetchCurrentDevice throws a DeviceNotTrackedException when device is forgotten.',
+          (_) async {
+        expect(await getDeviceState(), DeviceState.remembered);
+        await Amplify.Auth.forgetDevice();
+        await expectLater(
+          Amplify.Auth.fetchCurrentDevice,
+          throwsA(isA<DeviceNotTrackedException>()),
+        );
+      });
+
+      asyncTest(
+          'fetchCurrentDevice throws a SignedOutException when device signs out.',
+          (_) async {
+        await signOutUser();
+        await expectLater(
+          Amplify.Auth.fetchCurrentDevice,
+          throwsA(isA<SignedOutException>()),
+        );
+      });
+
       asyncTest('forgetDevice stops tracking', (_) async {
         expect(await getDeviceState(), DeviceState.remembered);
         await Amplify.Auth.forgetDevice();

packages/auth/amplify_auth_cognito_dart/example/lib/common.dart

@@ -104,6 +104,10 @@ Future<List<AuthUserAttribute>> fetchUserAttributes() async {
   return Amplify.Auth.fetchUserAttributes();
 }
 
+Future<AuthDevice> fetchCurrentDevice() async {
+  return Amplify.Auth.fetchCurrentDevice();
+}
+
 Future<List<AuthDevice>> fetchDevices() async {
   return Amplify.Auth.fetchDevices();
 }

packages/test/amplify_integration_test/lib/src/stubs/amplify_auth_cognito_stub.dart

@@ -368,6 +368,13 @@ class AmplifyAuthCognitoStub extends AuthPluginInterface
     );
   }
 
+  @override
+  Future<AuthDevice> fetchCurrentDevice() async {
+    throw UnimplementedError(
+      'fetchCurrentDevice is not implemented.',
+    );
+  }
+
   @override
   Future<void> forgetDevice([AuthDevice? device]) async {
     throw UnimplementedError(
@@ -391,7 +398,6 @@ class AmplifyAuthCognitoStub extends AuthPluginInterface
 }
 
 class MockCognitoUser {
-
   factory MockCognitoUser({
     required String username,
     required String password,