[gardening] Run subtests in parallel to avoid timeout for lib/isolate/spawn_uri__package_uri__test

Should make this test run within the normal timeout period.

TEST=ci

Change-Id: Ie8048a6cc7c31b193cf326bf9742fad279411b44
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/237688
Reviewed-by: Tess Strickland <sstrickl@google.com>
Commit-Queue: Martin Kustermann <kustermann@google.com>

tests/lib/isolate/spawn_uri__package_uri__test.dart

diff --git a/tests/lib/isolate/spawn_uri__package_uri__test.dart b/tests/lib/isolate/spawn_uri__package_uri__test.dart
index d5efa2c..b212874 100644
--- a/tests/lib/isolate/spawn_uri__package_uri__test.dart
+++ b/tests/lib/isolate/spawn_uri__package_uri__test.dart
@@ -12,6 +12,7 @@
 main() async {
   // Run the Dart VM with or without:
   //     --packages=<packages|package_config>
+  final futures = <Future>[];
   for (final runWithPackagesArg in const [true, false]) {
     // Run the isolate with or without
     //    Isolate.spawnUri(..., packageConfig: <packages|package_config>)
@@ -20,15 +21,16 @@
       print('TEST spawnWithPackageConfig = $spawnWithPackageConfig ');
       final bool checkForResolveUri =
           runWithPackagesArg || !spawnWithPackageConfig;
-      await runDotPackagesTest(
-          runWithPackagesArg, spawnWithPackageConfig, checkForResolveUri);
+      futures.add(runDotPackagesTest(
+          runWithPackagesArg, spawnWithPackageConfig, checkForResolveUri));
       for (final optionalPackageUri in const [true, false]) {
         print('TEST optionalPackageUri = $optionalPackageUri');
-        await runPackageConfigTest(runWithPackagesArg, spawnWithPackageConfig,
-            optionalPackageUri, checkForResolveUri);
+        futures.add(runPackageConfigTest(runWithPackagesArg,
+            spawnWithPackageConfig, optionalPackageUri, checkForResolveUri));
       }
     }
   }
+  await Future.wait(futures);
 }
 
 Future runPackageConfigTest(bool withPackagesArg, bool spawnWithArg,

tests/lib_2/isolate/spawn_uri__package_uri__test.dart

diff --git a/tests/lib_2/isolate/spawn_uri__package_uri__test.dart b/tests/lib_2/isolate/spawn_uri__package_uri__test.dart
index 46d4a14..23d4707 100644
--- a/tests/lib_2/isolate/spawn_uri__package_uri__test.dart
+++ b/tests/lib_2/isolate/spawn_uri__package_uri__test.dart
@@ -14,6 +14,7 @@
 main() async {
   // Run the Dart VM with or without:
   //     --packages=<packages|package_config>
+  final futures = <Future>[];
   for (final runWithPackagesArg in const [true, false]) {
     // Run the isolate with or without
     //    Isolate.spawnUri(..., packageConfig: <packages|package_config>)
@@ -22,15 +23,16 @@
       print('TEST spawnWithPackageConfig = $spawnWithPackageConfig ');
       final bool checkForResolveUri =
           runWithPackagesArg || !spawnWithPackageConfig;
-      await runDotPackagesTest(
-          runWithPackagesArg, spawnWithPackageConfig, checkForResolveUri);
+      futures.add(runDotPackagesTest(
+          runWithPackagesArg, spawnWithPackageConfig, checkForResolveUri));
       for (final optionalPackageUri in const [true, false]) {
         print('TEST optionalPackageUri = $optionalPackageUri');
-        await runPackageConfigTest(runWithPackagesArg, spawnWithPackageConfig,
-            optionalPackageUri, checkForResolveUri);
+        futures.add(runPackageConfigTest(runWithPackagesArg,
+            spawnWithPackageConfig, optionalPackageUri, checkForResolveUri));
       }
     }
   }
+  await Future.wait(futures);
 }
 
 Future runPackageConfigTest(bool withPackagesArg, bool spawnWithArg,