fix(driver): increased the Flutter driver reconnection delay to try and overcome some driver to app connection issues on slower machines

CHANGELOG.md

@@ -1,3 +1,6 @@
+## [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
+
 ## [1.1.7+1] - 07/01/2019
 * Ensured when the Flutter driver is closed it cannot throw an unhandled exception causing the test run the stop
 * Updated Gherkin library version

lib/src/flutter/flutter_run_process_handler.dart

@@ -41,6 +41,7 @@ class FlutterRunProcessHandler extends ProcessHandler {
   String _appTarget;
   String _buildFlavor;
   String _deviceTargetId;
+  Duration _driverConnectionDelay = const Duration(seconds: 2);
   String currentObservatoryUri;
 
   void setLogFlutterProcessOutput(bool logFlutterProcessOutput) {
@@ -51,6 +52,10 @@ class FlutterRunProcessHandler extends ProcessHandler {
     _appTarget = targetPath;
   }
 
+  void setDriverConnectionDelay(Duration duration) {
+    _driverConnectionDelay = duration ?? _driverConnectionDelay;
+  }
+
   void setWorkingDirectory(String workingDirectory) {
     _workingDirectory = workingDirectory;
   }
@@ -146,7 +151,7 @@ class FlutterRunProcessHandler extends ProcessHandler {
 
     // it seems we need a small delay here otherwise the flutter driver fails to
     // consistently connect
-    await Future.delayed(Duration(seconds: 1));
+    await Future.delayed(_driverConnectionDelay);
 
     return Future.value(true);
   }

lib/src/flutter/flutter_test_configuration.dart

@@ -52,7 +52,12 @@ class FlutterTestConfiguration extends TestConfiguration {
   /// Duration to wait for Flutter to build and start the app on the target device
   /// Slower machine may take longer to build and run a large app
   /// Defaults to 90 seconds
-  Duration flutterBuildTimeout = Duration(seconds: 90);
+  Duration flutterBuildTimeout = const Duration(seconds: 90);
+
+  /// Duration to wait before reconnecting the Flutter driver to the app.
+  /// On slower machines the app might not be in a state where the driver can successfully connect immediately
+  /// Defaults to 2 seconds
+  Duration flutterDriverReconnectionDelay = const Duration(seconds: 2);
 
   void setObservatoryDebuggerUri(String uri) => _observatoryDebuggerUri = uri;
 

lib/src/flutter/flutter_world.dart

@@ -49,7 +49,7 @@ class FlutterWorld extends World {
         await _driver.close();
       }
     } catch (e, st) {
-      print('Error closing Flutter driver:\n\n`${e}`\n\n${st}');
+      print('Error closing Flutter driver:\n\n`$e`\n\n$st');
     } finally {
       _driver = null;
     }

lib/src/flutter/hooks/app_runner_hook.dart

@@ -62,6 +62,7 @@ class FlutterAppRunnerHook extends Hook {
       ..setLogFlutterProcessOutput(config.logFlutterProcessOutput)
       ..setVerboseFluterlogs(config.verboseFlutterProcessLogs)
       ..setApplicationTargetFile(config.targetAppPath)
+      ..setDriverConnectionDelay(config.flutterDriverReconnectionDelay)
       ..setWorkingDirectory(config.targetAppWorkingDirecotry)
       ..setBuildRequired(haveRunFirstScenario ? false : config.build)
       ..setBuildFlavor(config.buildFlavor)

pubspec.yaml

@@ -1,6 +1,6 @@
 name: flutter_gherkin
 description: A Gherkin / Cucumber parser and test runner for Dart and Flutter
-version: 1.1.7+1
+version: 1.1.7+2
 author: Jon Samwell <jonsamwell@gmail.com>
 homepage: https://github.com/jonsamwell/flutter_gherkin