Add m-esr52 at 52.6.0

1 files changed, 136 insertions, 0 deletions

diff --git a/js/src/tests/ecma_6/Symbol/property-reflection.js b/js/src/tests/ecma_6/Symbol/property-reflection.js
new file mode 100644
index 000000000..5bdecf663
--- /dev/null
+++ b/js/src/tests/ecma_6/Symbol/property-reflection.js
@@ -0,0 +1,136 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/ */
+
+// Basic tests for standard Object APIs interacting with symbols.
+
+// Object.defineProperty
+function F() {}
+var f = new F;
+Object.defineProperty(f, Symbol.for("name"), {
+    configurable: true,
+    value: "eff"
+});
+assertEq("name" in f, false);
+assertEq("Symbol(name)" in f, false);
+assertEq(Symbol.for("name") in f, true);
+assertEq(f[Symbol.for("name")], "eff");
+
+// Object.defineProperties
+function D() {}
+var descs = new D;
+var s1 = Symbol("s1");
+var hits = 0;
+descs[s1] = {
+    get: () => hits++,
+    set: undefined,
+    enumerable: true,
+    configurable: true
+};
+var s2 = Symbol("s2");
+descs[s2] = {
+    value: {},
+    writable: true,
+    enumerable: false,
+    configurable: true
+};
+var s3 = Symbol("s3");
+D.prototype[s3] = {value: "FAIL"};
+assertEq(Object.defineProperties(f, descs), f);
+assertEq(s1 in f, true);
+assertEq(f[s1], 0);
+assertEq(hits, 1);
+assertEq(s2 in f, true);
+assertEq(f[s2], descs[s2].value);
+assertEq(s3 in f, false);
+
+// Object.create
+var n = Object.create({}, descs);
+assertEq(s1 in n, true);
+assertEq(n[s1], 1);
+assertEq(hits, 2);
+assertEq(s2 in n, true);
+assertEq(n[s2], descs[s2].value);
+assertEq(s3 in n, false);
+
+// Object.getOwnPropertyDescriptor
+var desc = Object.getOwnPropertyDescriptor(n, s1);
+assertDeepEq(desc, descs[s1]);
+assertEq(desc.get, descs[s1].get);
+desc = Object.getOwnPropertyDescriptor(n, s2);
+assertDeepEq(desc, descs[s2]);
+assertEq(desc.value, descs[s2].value);
+
+// Object.prototype.hasOwnProperty
+assertEq(descs.hasOwnProperty(s1), true);
+assertEq(descs.hasOwnProperty(s2), true);
+assertEq(descs.hasOwnProperty(s3), false);
+assertEq([].hasOwnProperty(Symbol.iterator), false);
+assertEq(Array.prototype.hasOwnProperty(Symbol.iterator), true);
+
+// Object.prototype.propertyIsEnumerable
+assertEq(n.propertyIsEnumerable(s1), true);
+assertEq(n.propertyIsEnumerable(s2), false);
+assertEq(n.propertyIsEnumerable(s3), false);  // no such property
+assertEq(D.prototype.propertyIsEnumerable(s3), true);
+assertEq(descs.propertyIsEnumerable(s3), false); // inherited properties are not considered
+
+// Object.preventExtensions
+var obj = {};
+obj[s1] = 1;
+assertEq(Object.preventExtensions(obj), obj);
+assertThrowsInstanceOf(function () { "use strict"; obj[s2] = 2; }, TypeError);
+obj[s2] = 2;  // still no effect
+assertEq(s2 in obj, false);
+
+// Object.isSealed, Object.isFrozen
+assertEq(Object.isSealed(obj), false);
+assertEq(Object.isFrozen(obj), false);
+assertEq(delete obj[s1], true);
+assertEq(Object.isSealed(obj), true);
+assertEq(Object.isFrozen(obj), true);
+
+obj = {};
+obj[s1] = 1;
+Object.preventExtensions(obj);
+Object.defineProperty(obj, s1, {configurable: false});  // still writable
+assertEq(Object.isSealed(obj), true);
+assertEq(Object.isFrozen(obj), false);
+obj[s1] = 2;
+assertEq(obj[s1], 2);
+Object.defineProperty(obj, s1, {writable: false});
+assertEq(Object.isFrozen(obj), true);
+
+// Object.seal, Object.freeze
+var obj = {};
+obj[s1] = 1;
+Object.seal(obj);
+desc = Object.getOwnPropertyDescriptor(obj, s1);
+assertEq(desc.configurable, false);
+assertEq(desc.writable, true);
+Object.freeze(obj);
+assertEq(Object.getOwnPropertyDescriptor(obj, s1).writable, false);
+
+// Object.setPrototypeOf purges caches for symbol-keyed properties.
+var proto = {};
+proto[s1] = 1;
+Object.defineProperty(proto, s2, {
+    get: () => 2,
+    set: v => undefined
+});
+var obj = Object.create(proto);
+var last1, last2;
+var N = 9;
+for (var i = 0; i < N; i++) {
+    last1 = obj[s1];
+    last2 = obj[s2];
+    obj[s2] = "marker";
+    if (i === N - 2)
+        Object.setPrototypeOf(obj, {});
+}
+assertEq(last1, undefined);
+assertEq(last2, undefined);
+assertEq(obj.hasOwnProperty(s2), true);
+assertEq(obj[s2], "marker");
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0);