Fix Dart 3 dev CI builds

_test/mono_pkg.yaml

@@ -10,9 +10,10 @@ stages:
   - analyze: --fatal-infos .
     os: linux
 - unit_test:
-  - group:
-    - command: dart run build_runner test -- -p chrome --test-randomize-ordering-seed=random
-    - command: dart run build_runner test -- -p vm test/configurable_uri_test.dart --test-randomize-ordering-seed=random
+  - command: dart run build_runner test -- -p chrome --test-randomize-ordering-seed=random
+  # TODO(https://github.com/dart-lang/build/issues/3423): restore this on windows 
+  - command: dart run build_runner test -- -p vm test/configurable_uri_test.dart --test-randomize-ordering-seed=random
+    os: linux
 - e2e_test:
   - test: --total-shards 3 --shard-index 0 --test-randomize-ordering-seed=random
     os: linux

_test_common/lib/sdk.dart

@@ -8,11 +8,15 @@ import 'dart:io';
 // ignore: implementation_imports
 import 'package:build_runner_core/src/util/constants.dart';
 import 'package:path/path.dart' as p;
+import 'package:pub_semver/pub_semver.dart';
 import 'package:test/test.dart';
 import 'package:test_descriptor/test_descriptor.dart' as d;
 
 String _dartBinary = p.join(sdkBin, 'dart');
 
+final bool supportsUnsoundNullSafety =
+    Version.parse(Platform.version.split(' ').first).major == 2;
+
 /// Runs `pub get` on [package] (which is assumed to be in a directory with
 /// that name under the [d.sandbox] directory).
 Future<ProcessResult> pubGet(String package, {bool offline = true}) async {

_test_common/pubspec.yaml

@@ -14,6 +14,7 @@ dependencies:
   logging: ^1.0.0
   package_config: ^2.0.0
   path: ^1.8.0
+  pub_semver: ^2.0.0
   test: ^1.16.0
   test_descriptor: ^2.0.0
   watcher: ^1.0.0

_test_null_safety/mono_pkg.yaml

@@ -12,12 +12,18 @@ stages:
     sdk: dev
 - e2e_test:
   - group:
-    - command: dart run build_runner test -- -p chrome,vm --test-randomize-ordering-seed=random
+    - command: dart run build_runner test -- -p chrome --test-randomize-ordering-seed=random
     - command: dart run build_runner test --define="build_web_compilers:entrypoint=compiler=dart2js" -- -p chrome --test-randomize-ordering-seed=random
+  # TODO(https://github.com/dart-lang/build/issues/3423): restore this on windows 
+  - command: dart run build_runner test -- -p vm --test-randomize-ordering-seed=random
+    os: linux
 # This stage is configured to only run for scheduled builds (see mono_repo.yaml)
 - e2e_test_cron:
   - group:
-    - command: dart run build_runner test -- -p chrome,vm --test-randomize-ordering-seed=random
+    - command: dart run build_runner test -- -p chrome --test-randomize-ordering-seed=random
     - command: dart run build_runner test --define="build_web_compilers:entrypoint=compiler=dart2js" -- -p chrome --test-randomize-ordering-seed=random
     sdk:
       - be/raw/latest
+  # TODO(https://github.com/dart-lang/build/issues/3423): restore this on windows 
+  - command: dart run build_runner test -- -p vm --test-randomize-ordering-seed=random
+    os: linux

build_runner/test/build_script_generate/build_script_generate_test.dart

@@ -140,57 +140,69 @@ environment:
         buildYaml,
         d.dir('lib', [d.file('builder.dart', '')]),
       ]).create();
-      await runPub('a', 'get');
+      var pubGetResult = await runPub('a', 'get');
+      expect(pubGetResult.exitCode, 0,
+          reason: 'stdout: ${pubGetResult.stdout}\n\n'
+              'stderr: ${pubGetResult.stderr}');
 
       final options = await findBuildScriptOptions(
           packageGraph: await PackageGraph.forPath('${d.sandbox}/a'));
       expect(options.canRunWithSoundNullSafety, isTrue);
     });
 
-    test('when the root package opts out', () async {
-      await d.dir('a', [
-        d.file('pubspec.yaml', '''
+    if (supportsUnsoundNullSafety) {
+      test('when the root package opts out', () async {
+        await d.dir('a', [
+          d.file('pubspec.yaml', '''
 name: a
 environment:
   sdk: '>=2.9.0 <3.0.0'
       '''),
-        d.dir('lib', [d.file('builder.dart', '')]),
-      ]).create();
-      await runPub('a', 'get');
+          d.dir('lib', [d.file('builder.dart', '')]),
+        ]).create();
+        var pubGetResult = await runPub('a', 'get');
+        expect(pubGetResult.exitCode, 0,
+            reason: 'stdout: ${pubGetResult.stdout}\n\n'
+                'stderr: ${pubGetResult.stderr}');
 
-      final options = await findBuildScriptOptions(
-          packageGraph: await PackageGraph.forPath('${d.sandbox}/a'));
-      expect(options.canRunWithSoundNullSafety, isFalse);
-    });
+        final options = await findBuildScriptOptions(
+            packageGraph: await PackageGraph.forPath('${d.sandbox}/a'));
+        expect(options.canRunWithSoundNullSafety, isFalse);
+      });
 
-    test('when a builder-defining package opts out', () async {
-      await d.dir('a', [
-        d.file('pubspec.yaml', '''
+      test('when a builder-defining package opts out', () async {
+        await d.dir('a', [
+          d.file('pubspec.yaml', '''
 name: a
 environment:
   sdk: '>=2.12.0 <3.0.0'
 dependencies:
   b:
     path: ../b/
       '''),
-      ]).create();
-      await d.dir('b', [
-        d.file('pubspec.yaml', '''
+        ]).create();
+        await d.dir('b', [
+          d.file('pubspec.yaml', '''
 name: b
 environment:
   sdk: '>=2.9.0 <3.0.0'
       '''),
-        buildYaml,
-        d.dir('lib', [
-          d.file('builder.dart', ''),
-        ]),
-      ]).create();
-      await runPub('a', 'get');
+          buildYaml,
+          d.dir('lib', [
+            d.file('builder.dart', ''),
+          ]),
+        ]).create();
+        await runPub('a', 'get');
+        var pubGetResult = await runPub('a', 'get');
+        expect(pubGetResult.exitCode, 0,
+            reason: 'stdout: ${pubGetResult.stdout}\n\n'
+                'stderr: ${pubGetResult.stderr}');
 
-      final options = await findBuildScriptOptions(
-          packageGraph: await PackageGraph.forPath('${d.sandbox}/a'));
-      expect(options.canRunWithSoundNullSafety, isFalse);
-    });
+        final options = await findBuildScriptOptions(
+            packageGraph: await PackageGraph.forPath('${d.sandbox}/a'));
+        expect(options.canRunWithSoundNullSafety, isFalse);
+      });
+    }
 
     test('when a builder-defining library ops out', () async {
       await d.dir('a', [
@@ -203,6 +215,10 @@ environment:
         d.dir('lib', [d.file('builder.dart', '// @dart=2.9')]),
       ]).create();
       await runPub('a', 'get');
+      var pubGetResult = await runPub('a', 'get');
+      expect(pubGetResult.exitCode, 0,
+          reason: 'stdout: ${pubGetResult.stdout}\n\n'
+              'stderr: ${pubGetResult.stderr}');
 
       final options = await findBuildScriptOptions(
           packageGraph: await PackageGraph.forPath('${d.sandbox}/a'));
@@ -227,6 +243,10 @@ builders:
         d.dir('tool', [d.file('builder.dart', '//@dart=2.9')]),
       ]).create();
       await runPub('a', 'get');
+      var pubGetResult = await runPub('a', 'get');
+      expect(pubGetResult.exitCode, 0,
+          reason: 'stdout: ${pubGetResult.stdout}\n\n'
+              'stderr: ${pubGetResult.stderr}');
 
       final options = await findBuildScriptOptions(
           packageGraph: await PackageGraph.forPath('${d.sandbox}/a'));
@@ -251,6 +271,10 @@ builders:
         d.dir('tool', [d.file('builder.dart', '')]),
       ]).create();
       await runPub('a', 'get');
+      var pubGetResult = await runPub('a', 'get');
+      expect(pubGetResult.exitCode, 0,
+          reason: 'stdout: ${pubGetResult.stdout}\n\n'
+              'stderr: ${pubGetResult.stderr}');
 
       final options = await findBuildScriptOptions(
           packageGraph: await PackageGraph.forPath('${d.sandbox}/a'));

build_vm_compilers/test/vm_kernel_integration_test.dart

@@ -9,7 +9,9 @@ import 'package:test/test.dart';
 import 'package:test_descriptor/test_descriptor.dart' as d;
 
 void main() {
-  group('without null safety', () => _runTests(false));
+  if (supportsUnsoundNullSafety) {
+    group('without null safety', () => _runTests(false));
+  }
   group('with null safety', () => _runTests(true));
 }
 

build_web_compilers/test/fixtures/a/pubspec.yaml

@@ -1,7 +1,7 @@
 name: a
 
 environment:
-  sdk: ">=1.0.0 <3.0.0"
+  sdk: ">=1.0.0 <4.0.0"
 
 dependencies:
   b:

build_web_compilers/test/fixtures/b/pubspec.yaml

@@ -1,7 +1,7 @@
 name: b
 
 environment:
-  sdk: ">=1.0.0 <3.0.0"
+  sdk: ">=1.0.0 <4.0.0"
 
 dependencies:
   a: