[test] Adding a level of indirection for more clarity in constant identity tests.

Change-Id: I9aa6c6bf278e8c8357d416d1a25be1eda4a4bf21
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/398761
Commit-Queue: Mark Zhou <[email protected]>
Reviewed-by: Nate Biggs <[email protected]>

Author: Markzipan

tests/hot_reload/constant_identical/main.0.dart

@@ -16,10 +16,17 @@ class Fruit {
 
 var x;
 
+helper() {
+  return const Fruit('Pear');
+}
+
 Future<void> main() async {
   x = const Fruit('Pear');
   Expect.equals('Pear', x.toString());
+  Expect.identical(x, helper());
+
   await hotReload();
   Expect.equals('Pear', x.toString());
   Expect.identical(x, const Fruit('Pear'));
+  Expect.identical(x, helper());
 }

tests/hot_reload/constant_identical/main.1.dart

@@ -16,12 +16,19 @@ class Fruit {
 
 var x;
 
+helper() {
+  return const Fruit('Pear');
+}
+
 Future<void> main() async {
   x = const Fruit('Pear');
   Expect.equals('Pear', x.toString());
+  Expect.identical(x, helper());
+
   await hotReload();
   Expect.equals('Pear', x.toString());
   Expect.identical(x, const Fruit('Pear'));
+  Expect.identical(x, helper());
 }
 /** DIFF **/
 /*

tests/hot_reload/constant_nonidentical/main.0.dart

@@ -0,0 +1,33 @@
+// Copyright (c) 2024, 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.
+
+import 'package:expect/expect.dart';
+import 'package:reload_test/reload_test_utils.dart';
+
+// Adapted from:
+// https://github.com/dart-lang/sdk/blob/26f2ff4f11f56841fc5a250231ef7d49f01eb234/runtime/vm/isolate_reload_test.cc#L2604
+// Extended with logic to check for non-identity.
+
+class Fruit {
+  final String name;
+  const Fruit(this.name);
+  String toString() => name;
+}
+
+var x;
+
+helper() {
+  return const Fruit('Pear');
+}
+
+Future<void> main() async {
+  x = const Fruit('Pear');
+  Expect.equals('Pear', x.toString());
+  Expect.identical(x, helper());
+
+  await hotReload();
+  Expect.equals('Pear', x.toString());
+  Expect.identical(x, const Fruit('Pear'));
+  Expect.notIdentical(x, helper());
+}

tests/hot_reload/constant_nonidentical/main.1.dart

@@ -0,0 +1,45 @@
+// Copyright (c) 2024, 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.
+
+import 'package:expect/expect.dart';
+import 'package:reload_test/reload_test_utils.dart';
+
+// Adapted from:
+// https://github.com/dart-lang/sdk/blob/26f2ff4f11f56841fc5a250231ef7d49f01eb234/runtime/vm/isolate_reload_test.cc#L2604
+// Extended with logic to check for non-identity.
+
+class Fruit {
+  final String name;
+  final String field = 'field';
+  const Fruit(this.name);
+  String toString() => name;
+}
+
+var x;
+
+helper() {
+  return const Fruit('Pear');
+}
+
+Future<void> main() async {
+  x = const Fruit('Pear');
+  Expect.equals('Pear', x.toString());
+  Expect.identical(x, helper());
+
+  await hotReload();
+  Expect.equals('Pear', x.toString());
+  Expect.identical(x, const Fruit('Pear'));
+  Expect.notIdentical(x, helper());
+}
+/** DIFF **/
+/*
+@@ -11,6 +11,7 @@
+ 
+ class Fruit {
+   final String name;
++  final String field = 'field';
+   const Fruit(this.name);
+   String toString() => name;
+ }
+*/