1 files changed, 76 insertions, 0 deletions
diff --git a/js/src/tests/non262/Intl/PluralRules/construct-newtarget.js b/js/src/tests/non262/Intl/PluralRules/construct-newtarget.js
new file mode 100644
index 0000000000..356c2dd221
--- /dev/null
+++ b/js/src/tests/non262/Intl/PluralRules/construct-newtarget.js
@@ -0,0 +1,76 @@
+// |reftest| skip-if(!this.hasOwnProperty("Intl"))
+
+// Test subclassing %Intl.PluralRules% works correctly.
+class MyPluralRules extends Intl.PluralRules {}
+
+var obj = new MyPluralRules();
+assertEq(obj instanceof MyPluralRules, true);
+assertEq(obj instanceof Intl.PluralRules, true);
+assertEq(Object.getPrototypeOf(obj), MyPluralRules.prototype);
+
+obj = Reflect.construct(MyPluralRules, []);
+assertEq(obj instanceof MyPluralRules, true);
+assertEq(obj instanceof Intl.PluralRules, true);
+assertEq(Object.getPrototypeOf(obj), MyPluralRules.prototype);
+
+obj = Reflect.construct(MyPluralRules, [], MyPluralRules);
+assertEq(obj instanceof MyPluralRules, true);
+assertEq(obj instanceof Intl.PluralRules, true);
+assertEq(Object.getPrototypeOf(obj), MyPluralRules.prototype);
+
+obj = Reflect.construct(MyPluralRules, [], Intl.PluralRules);
+assertEq(obj instanceof MyPluralRules, false);
+assertEq(obj instanceof Intl.PluralRules, true);
+assertEq(Object.getPrototypeOf(obj), Intl.PluralRules.prototype);
+
+
+// Set a different constructor as NewTarget.
+obj = Reflect.construct(MyPluralRules, [], Array);
+assertEq(obj instanceof MyPluralRules, false);
+assertEq(obj instanceof Intl.PluralRules, false);
+assertEq(obj instanceof Array, true);
+assertEq(Object.getPrototypeOf(obj), Array.prototype);
+
+obj = Reflect.construct(Intl.PluralRules, [], Array);
+assertEq(obj instanceof Intl.PluralRules, false);
+assertEq(obj instanceof Array, true);
+assertEq(Object.getPrototypeOf(obj), Array.prototype);
+
+
+// The prototype defaults to %PluralRulesPrototype% if null.
+function NewTargetNullPrototype() {}
+NewTargetNullPrototype.prototype = null;
+
+obj = Reflect.construct(Intl.PluralRules, [], NewTargetNullPrototype);
+assertEq(obj instanceof Intl.PluralRules, true);
+assertEq(Object.getPrototypeOf(obj), Intl.PluralRules.prototype);
+
+obj = Reflect.construct(MyPluralRules, [], NewTargetNullPrototype);
+assertEq(obj instanceof MyPluralRules, false);
+assertEq(obj instanceof Intl.PluralRules, true);
+assertEq(Object.getPrototypeOf(obj), Intl.PluralRules.prototype);
+
+
+// "prototype" property is retrieved exactly once.
+var trapLog = [], getLog = [];
+var ProxiedConstructor = new Proxy(Intl.PluralRules, new Proxy({
+    get(target, propertyKey, receiver) {
+        getLog.push(propertyKey);
+        return Reflect.get(target, propertyKey, receiver);
+    }
+}, {
+    get(target, propertyKey, receiver) {
+        trapLog.push(propertyKey);
+        return Reflect.get(target, propertyKey, receiver);
+    }
+}));
+
+obj = Reflect.construct(Intl.PluralRules, [], ProxiedConstructor);
+assertEqArray(trapLog, ["get"]);
+assertEqArray(getLog, ["prototype"]);
+assertEq(obj instanceof Intl.PluralRules, true);
+assertEq(Object.getPrototypeOf(obj), Intl.PluralRules.prototype);
+
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0);