Improve the error message for pub install without a name key in the pubspec.

utils/tests/pub/pub_update_test.dart

Index: utils/tests/pub/pub_update_test.dart
diff --git a/utils/tests/pub/pub_update_test.dart b/utils/tests/pub/pub_update_test.dart
index 09aa6495534504f86495fed0c4af4488b8507bd3..179d903f479d6b9da25c47400b6b0bee3fa231f8 100644
--- a/utils/tests/pub/pub_update_test.dart
+++ b/utils/tests/pub/pub_update_test.dart
@@ -26,7 +26,8 @@ main() {
       ]).scheduleCreate();
 
       schedulePub(args: ['update'],
-          error: const RegExp(@'^"pubspec.yaml" must contain a "name" key\.'));
+          error: const RegExp(@'^"pubspec.yaml" is missing the required "name" '
+              @'field \(e\.g\. "name: myapp"\)\.'));
 
       run();
     });