fix(driver): added retry logic to the Futter driver connect call to handle the seemingly random connection failures

CHANGELOG.md

@@ -1,3 +1,6 @@
+## [1.1.7+3] - 08/01/2019
+* Added retry logic to the Futter driver connect call to handle the seemingly random connection failures
+
 ## [1.1.7+2] - 07/01/2019
 * Increased the Flutter driver reconnection delay to try and overcome some driver to app connection issues on slower machines
 

lib/src/flutter/flutter_test_configuration.dart

@@ -59,15 +59,17 @@ class FlutterTestConfiguration extends TestConfiguration {
   /// Defaults to 2 seconds
   Duration flutterDriverReconnectionDelay = const Duration(seconds: 2);
 
+  /// The maximum times the flutter driver can try and connect to the running app
+  /// Defaults to 3
+  int flutterDriverMaxConnectionAttemps = 3;
+
   void setObservatoryDebuggerUri(String uri) => _observatoryDebuggerUri = uri;
 
   Future<FlutterDriver> createFlutterDriver([String dartVmServiceUrl]) async {
     dartVmServiceUrl = (dartVmServiceUrl ?? _observatoryDebuggerUri) ??
         Platform.environment['VM_SERVICE_URL'];
 
-    return await FlutterDriver.connect(
-      dartVmServiceUrl: dartVmServiceUrl,
-    );
+    return await _attemptDriverConnection(dartVmServiceUrl, 1, 3);
   }
 
   Future<FlutterWorld> createFlutterWorld(
@@ -101,4 +103,29 @@ class FlutterTestConfiguration extends TestConfiguration {
         RestartAppStep()
       ]);
   }
+
+  Future<FlutterDriver> _attemptDriverConnection(
+    String dartVmServiceUrl,
+    int attempt,
+    int maxAttemps,
+  ) async {
+    try {
+      return await FlutterDriver.connect(
+        dartVmServiceUrl: dartVmServiceUrl,
+      );
+    } catch (e) {
+      if (attempt > maxAttemps) {
+        rethrow;
+      } else {
+        print(e);
+        await Future<void>.delayed(flutterDriverReconnectionDelay);
+
+        return _attemptDriverConnection(
+          dartVmServiceUrl,
+          attempt + 1,
+          maxAttemps,
+        );
+      }
+    }
+  }
 }