Fix DevTools extensions not being resolved when app's Dart entrypoint is located in `integration_test` directory (#6644)

packages/devtools_app/lib/src/extensions/extension_service.dart

diff --git a/packages/devtools_app/lib/src/extensions/extension_service.dart b/packages/devtools_app/lib/src/extensions/extension_service.dart
index 4d7a51c..33b7c72 100644
--- a/packages/devtools_app/lib/src/extensions/extension_service.dart
+++ b/packages/devtools_app/lib/src/extensions/extension_service.dart
@@ -162,11 +162,12 @@
   // server and having the server look for the package folder that contains the
   // `.dart_tool` directory.
 
-  // Assume that the parent folder of `lib` is the package root.
-  final libDirectoryRegExp = RegExp(r'\/lib\/[^\/.]*.dart');
-  final libDirectoryIndex = fileUri.indexOf(libDirectoryRegExp);
-  if (libDirectoryIndex != -1) {
-    fileUri = fileUri.substring(0, libDirectoryIndex);
+  final directoryRegExp =
+      RegExp(r'\/(lib|integration_test|test|bin)\/[^\/.]*.dart');
+  final directoryIndex = fileUri.indexOf(directoryRegExp);
+  if (directoryIndex != -1) {
+    fileUri = fileUri.substring(0, directoryIndex);
   }
+
   return fileUri;
 }

packages/devtools_app/release_notes/NEXT_RELEASE_NOTES.md

diff --git a/packages/devtools_app/release_notes/NEXT_RELEASE_NOTES.md b/packages/devtools_app/release_notes/NEXT_RELEASE_NOTES.md
index 8527d59..d48505b 100644
--- a/packages/devtools_app/release_notes/NEXT_RELEASE_NOTES.md
+++ b/packages/devtools_app/release_notes/NEXT_RELEASE_NOTES.md
@@ -10,7 +10,10 @@
 
 ## General updates
 
-TODO: Remove this section if there are not any general updates.
+* Enabled DevTools extensions when debugging a Dart entry point that is not
+under `lib` (e.g. a unit test or integration test). Thanks to
+[@bartekpacia](https://github.com/bartekpacia) for this change! -
+[#6644](https://github.com/flutter/devtools/pull/6644)
 
 ## Inspector updates