Add m-esr52 at 52.6.0

1 files changed, 46 insertions, 0 deletions

diff --git a/js/src/tests/ecma_6/Object/getOwnPropertySymbols.js b/js/src/tests/ecma_6/Object/getOwnPropertySymbols.js
new file mode 100644
index 000000000..b92d14ef1
--- /dev/null
+++ b/js/src/tests/ecma_6/Object/getOwnPropertySymbols.js
@@ -0,0 +1,46 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/ */
+
+assertDeepEq(Object.getOwnPropertySymbols({}), []);
+
+// String keys are ignored.
+assertEq(Object.getOwnPropertySymbols({a: 1, b: 2}).length, 0);
+assertEq(Object.getOwnPropertySymbols([0, 1, 2, 3]).length, 0);
+
+// Symbol keys are observed.
+var iterable = {};
+Object.defineProperty(iterable, Symbol.iterator, {
+    value: () => [][Symbol.iterator]()
+});
+assertDeepEq(Object.getOwnPropertySymbols(iterable), [Symbol.iterator]);
+assertDeepEq(Object.getOwnPropertySymbols(new Proxy(iterable, {})), [Symbol.iterator]);
+
+// Test on an object with a thousand own properties.
+var obj = {};
+for (var i = 0; i < 1000; i++) {
+    obj[Symbol.for("x" + i)] = 1;
+}
+assertEq(Object.getOwnPropertyNames(obj).length, 0);
+var symbols = Object.getOwnPropertySymbols(obj);
+assertEq(symbols.length, 1000);
+assertEq(symbols.indexOf(Symbol.for("x0")) !== -1, true);
+assertEq(symbols.indexOf(Symbol.for("x241")) !== -1, true);
+assertEq(symbols.indexOf(Symbol.for("x999")) !== -1, true);
+assertEq(Object.getOwnPropertySymbols(new Proxy(obj, {})).length, 1000);
+
+// The prototype chain is not consulted.
+assertEq(Object.getOwnPropertySymbols(Object.create(obj)).length, 0);
+assertEq(Object.getOwnPropertySymbols(new Proxy(Object.create(obj), {})).length, 0);
+
+// Primitives are coerced to objects; but there are never any symbol-keyed
+// properties on the resulting wrapper objects.
+assertThrowsInstanceOf(() => Object.getOwnPropertySymbols(), TypeError);
+assertThrowsInstanceOf(() => Object.getOwnPropertySymbols(undefined), TypeError);
+assertThrowsInstanceOf(() => Object.getOwnPropertySymbols(null), TypeError);
+for (var primitive of [true, 1, 3.14, "hello", Symbol()])
+    assertEq(Object.getOwnPropertySymbols(primitive).length, 0);
+
+assertEq(Object.getOwnPropertySymbols.length, 1);
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0);