fix debugging tests

pkgs/pubspec_parse/test/pub_utils.dart

diff --git a/pkgs/pubspec_parse/test/pub_utils.dart b/pkgs/pubspec_parse/test/pub_utils.dart
index 1ebb9c7..17e8970 100644
--- a/pkgs/pubspec_parse/test/pub_utils.dart
+++ b/pkgs/pubspec_parse/test/pub_utils.dart
@@ -13,8 +13,13 @@
 Future<ProcResult> tryPub(String content) async {
   await d.file('pubspec.yaml', content).create();
 
-  final proc = await TestProcess.start(_pubPath, ['get', '--offline'],
-      workingDirectory: d.sandbox);
+  final proc = await TestProcess.start(
+    _pubPath,
+    ['get', '--offline'],
+    workingDirectory: d.sandbox,
+    // Don't pass current process VM options to child
+    environment: Map.from(Platform.environment)..remove('DART_VM_OPTIONS'),
+  );
 
   final result = await ProcResult.fromTestProcess(proc);