Pass spec down to WebDriver instance creation in test.
diff --git a/test/configs/async_io_config.dart b/test/configs/async_io_config.dart
index 9d0ed83..ebff8aa 100644
--- a/test/configs/async_io_config.dart
+++ b/test/configs/async_io_config.dart
@@ -34,7 +34,7 @@
   if (additionalCapabilities != null) {
     capabilities.addAll(additionalCapabilities);
   }
-  return createDriver(desired: capabilities, uri: getWebDriverUri(spec));
+  return createDriver(desired: capabilities, uri: getWebDriverUri(spec), spec: spec);
 }
 
 String get forwarderTestPagePath =>
diff --git a/test/configs/sync_io_config.dart b/test/configs/sync_io_config.dart
index 0795003..0322752 100644
--- a/test/configs/sync_io_config.dart
+++ b/test/configs/sync_io_config.dart
@@ -34,7 +34,7 @@
   if (additionalCapabilities != null) {
     capabilities.addAll(additionalCapabilities);
   }
-  return createDriver(desired: capabilities, uri: getWebDriverUri(spec));
+  return createDriver(desired: capabilities, uri: getWebDriverUri(spec), spec: spec);
 }
 
 Future<HttpServer> createTestServerAndGoToTestPage(WebDriver driver) async {