Add m-esr52 at 52.6.0

1 files changed, 50 insertions, 0 deletions

diff --git a/js/src/tests/ecma_6/Symbol/property-inheritance.js b/js/src/tests/ecma_6/Symbol/property-inheritance.js
new file mode 100644
index 000000000..2fe618968
--- /dev/null
+++ b/js/src/tests/ecma_6/Symbol/property-inheritance.js
@@ -0,0 +1,50 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/ */
+
+var sym = Symbol.for("hello");
+function F() {}
+var f = new F();
+
+// inherited data property
+F.prototype[sym] = "world";
+assertEq(sym in f, true);
+assertEq(f.hasOwnProperty(sym), false);
+assertEq(f[sym], "world");
+
+// shadowing assignment
+f[sym] = "kitty";
+assertEq(f[sym], "kitty");
+assertEq(F.prototype[sym], "world");
+
+// deletion, revealing previously shadowed property
+assertEq(delete f[sym], true);
+assertEq(f.hasOwnProperty(sym), false);
+assertEq(f[sym], "world");
+
+// inherited accessor property
+var value = undefined;
+Object.defineProperty(F.prototype, sym, {
+    configurable: true,
+    get: function () { return 23; },
+    set: function (v) { value = v; }
+});
+assertEq(sym in f, true);
+assertEq(f.hasOwnProperty(sym), false);
+assertEq(f[sym], 23);
+f[sym] = "gravity";
+assertEq(value, "gravity");
+
+// inherited accessor property with no setter
+Object.defineProperty(F.prototype, sym, {
+    set: undefined
+});
+assertThrowsInstanceOf(function () { "use strict"; f[sym] = 0; }, TypeError);
+
+// deeply inherited accessor property
+var g = Object.create(f);
+for (var i = 0; i < 100; i++)
+    g = Object.create(g);
+assertEq(g[sym], 23);
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0);