test: Add integration test for ExponentialBackoffReconnectionPolicy

packages/moxxmpp/integration_test/failure_reconnection_test.dart

@@ -10,7 +10,7 @@ void main() {
   });
   final log = Logger('FailureReconnectionTest');
 
-  test('Failing an awaited connection', () async {
+  test('Failing an awaited connection with TestingSleepReconnectionPolicy', () async {
     var errors = 0;
     final connection = XmppConnection(
       TestingSleepReconnectionPolicy(10),
@@ -52,4 +52,47 @@ void main() {
     await Future.delayed(const Duration(seconds: 20));
     expect(errors, 1);
   }, timeout: Timeout.factor(2));
+
+  test('Failing an awaited connection with ExponentialBackoffReconnectionPolicy', () async {
+    var errors = 0;
+    final connection = XmppConnection(
+      ExponentialBackoffReconnectionPolicy(1),
+      TCPSocketWrapper(false),
+    );
+    connection.registerFeatureNegotiators([
+      StartTlsNegotiator(),
+    ]);
+    connection.registerManagers([
+      DiscoManager(),
+      RosterManager(),
+      PingManager(),
+      MessageManager(),
+      PresenceManager('http://moxxmpp.example'),
+    ]);
+    connection.asBroadcastStream().listen((event) {
+      if (event is ConnectionStateChangedEvent) {
+        if (event.state == XmppConnectionState.error) {
+          errors++;
+        }
+      }
+    });
+
+    connection.setConnectionSettings(
+      ConnectionSettings(
+        jid: JID.fromString('testuser@no-sasl.badxmpp.eu'),
+        password: 'abc123',
+        useDirectTLS: true,
+        allowPlainAuth: true,
+      ),
+    );
+
+    final result = await connection.connectAwaitable();
+    log.info('Connection failed as expected');
+    expect(result.success, false);
+    expect(errors, 1);
+
+    log.info('Waiting 20 seconds for unexpected reconnections');
+    await Future.delayed(const Duration(seconds: 20));
+    expect(errors, 1);
+  }, timeout: Timeout.factor(2));
 }

packages/moxxmpp/lib/src/reconnect.dart

@@ -80,10 +80,11 @@ abstract class ReconnectionPolicy {
 /// for every failed attempt.
 class ExponentialBackoffReconnectionPolicy extends ReconnectionPolicy {
 
-  ExponentialBackoffReconnectionPolicy()
+  ExponentialBackoffReconnectionPolicy(this._maxBackoffTime)
   : _counter = 0,
     _log = Logger('ExponentialBackoffReconnectionPolicy'),
     super();
+  final int _maxBackoffTime;
   int _counter;
   Timer? _timer;
   final Logger _log;
@@ -124,7 +125,7 @@ class ExponentialBackoffReconnectionPolicy extends ReconnectionPolicy {
     }
 
     // Wait at max 80 seconds.
-    final seconds = min(pow(2, _counter).toInt(), 80);
+    final seconds = min(min(pow(2, _counter).toInt(), 80), _maxBackoffTime);
     _timer = Timer(Duration(seconds: seconds), _onTimerElapsed);
   }