fix unnecessary_string_interpolations lint (#50790)
diff --git a/dev/bots/test.dart b/dev/bots/test.dart
index e2398e9..5c82140 100644
--- a/dev/bots/test.dart
+++ b/dev/bots/test.dart
@@ -595,7 +595,7 @@
Future<void> _runWebStackTraceTest(String buildMode) async {
final String testAppDirectory = path.join(flutterRoot, 'dev', 'integration_tests', 'web');
- final String appBuildDirectory = path.join('$testAppDirectory', 'build', 'web');
+ final String appBuildDirectory = path.join(testAppDirectory, 'build', 'web');
// Build the app.
await runCommand(