-

packages/devtools_app/integration_test/run_tests.dart

@@ -25,13 +25,12 @@ void main(List<String> args) async {
     return;
   }
 
-  Exception? exception;
   final chromedriver = ChromeDriver();
 
-  // Start chrome driver before running the flutter integration test.
-  await chromedriver.start();
-
   try {
+    // Start chrome driver before running the flutter integration test.
+    await chromedriver.start();
+
     if (testRunnerArgs.testTarget != null) {
       // TODO(kenz): add support for specifying a directory as the target instead
       // of a single file.
@@ -52,15 +51,9 @@ void main(List<String> args) async {
         await _runTest(newArgsWithTarget);
       }
     }
-  } on Exception catch (e) {
-    exception = e;
   } finally {
     await chromedriver.stop();
   }
-
-  if (exception != null) {
-    throw exception;
-  }
 }
 
 Future<void> _runTest(

packages/devtools_app/integration_test/test_infra/run/_chrome_driver.dart

@@ -8,30 +8,35 @@ import '_io_utils.dart';
 import '_utils.dart';
 
 class ChromeDriver with IOMixin {
-  late final Process _process;
+  Process? _process;
 
   // TODO(kenz): add error messaging if the chromedriver executable is not
   // found. We can also consider using web installers directly in this script:
   // https://github.com/flutter/flutter/wiki/Running-Flutter-Driver-tests-with-Web#web-installers-repo.
   Future<void> start() async {
     try {
       debugLog('starting the chromedriver process');
-      _process = await Process.start(
+      final process = _process = await Process.start(
         'chromedriver',
         [
           '--port=4444',
         ],
       );
-      listenToProcessOutput(_process, printTag: 'ChromeDriver');
+      listenToProcessOutput(process, printTag: 'ChromeDriver');
     } catch (e) {
       // ignore: avoid-throw-in-catch-block, by design
       throw Exception('Error starting chromedriver: $e');
     }
   }
 
   Future<void> stop() async {
+    final process = _process;
+    _process = null;
+
+    if (process == null) return;
+
     await cancelAllStreamSubscriptions();
     debugLog('killing the chromedriver process');
-    await killGracefully(_process);
+    await killGracefully(process);
   }
 }