Add m-esr52 at 52.6.0

1 files changed, 19 insertions, 0 deletions

diff --git a/js/src/tests/ecma_6/Symbol/json-stringify-keys.js b/js/src/tests/ecma_6/Symbol/json-stringify-keys.js
new file mode 100644
index 000000000..3818cbb33
--- /dev/null
+++ b/js/src/tests/ecma_6/Symbol/json-stringify-keys.js
@@ -0,0 +1,19 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/ */
+
+// JSON.stringify ignores symbol-keyed properties, even enumerable ones.
+
+var obj = {a: 1};
+obj[Symbol.for("ponies")] = {toJSON: function () { throw "fit"; }};
+obj[Symbol.iterator] = {toJSON: function () { throw "fit"; }};
+assertEq(JSON.stringify(obj), '{"a":1}');
+
+var replacer = function (k, v) {
+    if (typeof k === "symbol")
+        throw "fit";
+    return v;
+};
+assertEq(JSON.stringify(obj, replacer), '{"a":1}');
+
+if (typeof reportCompare === 'function')
+    reportCompare(0, 0, 'ok');