#3330. Add debugger tests for static extensions (#3383)

Add debugger tests for static extensions

Author: sgrekhov

VM/static_extensions_t01.dart

@@ -0,0 +1,55 @@
+// Copyright (c) 2025, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion Consider an expression `e` which is a member invocation with
+/// syntactic receiver `C` and an associated member name `m`. Assume that `m` is
+/// a static member declared by `D`. The static analysis and dynamic semantics
+/// of this expression is the same as in Dart before the introduction of this
+/// feature.
+/// ...
+/// Assume that it is an extension `E` that declares a static member named `m`.
+/// The invocation is then treated as `E.m()`.
+///
+/// @description Check that `C.m()` is treated as `E.m()`.
+/// @author [email protected]
+
+// SharedOptions=--enable-experiment=static-extensions
+
+import 'dart:developer';
+import 'package:vm_service/vm_service.dart';
+
+import '../../../../pkg/vm_service/test/common/service_test_common.dart';
+import '../../../../pkg/vm_service/test/common/test_helper.dart';
+import '../Utils/expect.dart';
+
+class C {}
+
+extension ExtC on C {
+  static String foo() => "ExtC";
+}
+
+void testeeMain() {
+  debugger();
+}
+
+final tests = <IsolateTest>[
+  hasStoppedAtBreakpoint,
+
+  // Test interaction of expression evaluation with static extensions.
+      (VmService service, IsolateRef isolateRef) async {
+    final isolateId = isolateRef.id!;
+
+    InstanceRef response =
+      await service.evaluateInFrame(isolateId, 0, 'C.foo()') as InstanceRef;
+    Expect.equals('ExtC', response.valueAsString);
+  },
+];
+
+void main([args = const <String>[]]) => runIsolateTests(
+  args,
+  tests,
+  'static_extensions_t01.dart',
+  pauseOnExit: true,
+  testeeConcurrent: testeeMain,
+);

VM/static_extensions_t02.dart

@@ -0,0 +1,63 @@
+// Copyright (c) 2025, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion Consider an expression `e` which is a member invocation with
+/// syntactic receiver `C` and an associated member name `m`. Assume that `m` is
+/// a static member declared by `D`. The static analysis and dynamic semantics
+/// of this expression is the same as in Dart before the introduction of this
+/// feature.
+/// ...
+/// Assume that it is an extension `E` that declares a static member named `m`.
+/// The invocation is then treated as `E.m()`.
+///
+/// @description Check that `C.m()` is treated as `E.m()`.
+/// @author [email protected]
+
+// SharedOptions=--enable-experiment=static-extensions
+
+import 'dart:developer';
+import 'package:vm_service/vm_service.dart';
+
+import '../../../../pkg/vm_service/test/common/service_test_common.dart';
+import '../../../../pkg/vm_service/test/common/test_helper.dart';
+import '../Utils/expect.dart';
+
+// AUTOGENERATED START
+//
+// Update these constants by running:
+//
+// dart pkg/vm_service/test/update_line_numbers.dart tests/co19/src/VM/static_extensions_t02.dart
+//
+const LINE_A = 40;
+const LINE_B = 44;
+const LINE_C = 45;
+// AUTOGENERATED END
+
+class C {}
+
+extension ExtC on C {
+  static String foo() => "ExtC"; // LINE_A
+}
+
+void testeeMain() {
+  debugger();           // LINE_B
+  C.foo();              // LINE_C
+}
+
+final tests = <IsolateTest>[
+  hasStoppedAtBreakpoint,
+  stoppedAtLine(LINE_B),
+  stepInto,
+  stoppedAtLine(LINE_C),
+  stepInto,
+  stoppedAtLine(LINE_A),
+];
+
+void main([args = const <String>[]]) => runIsolateTests(
+  args,
+  tests,
+  'static_extensions_t02.dart',
+  pauseOnExit: true,
+  testeeConcurrent: testeeMain,
+);