1 files changed, 33 insertions, 0 deletions
diff --git a/js/xpconnect/tests/unit/test_structuredClone.js b/js/xpconnect/tests/unit/test_structuredClone.js
new file mode 100644
index 0000000000..9ecb51951d
--- /dev/null
+++ b/js/xpconnect/tests/unit/test_structuredClone.js
@@ -0,0 +1,33 @@
+function run_test() {
+  var sb = new Cu.Sandbox("http://www.example.com", {
+    wantGlobalProperties: ["structuredClone"],
+  });
+
+  sb.equal = equal;
+
+  sb.testing = Cu.cloneInto({ xyz: 123 }, sb);
+  Cu.evalInSandbox(
+    `
+    equal(structuredClone("abc"), "abc");
+
+    var obj = { a: 1 };
+    obj.self = obj;
+    var clone = structuredClone(obj);
+    equal(clone.a, 1);
+    equal(clone.self, clone);
+
+    var ab = new ArrayBuffer(1);
+    clone = structuredClone(ab, { transfer: [ab] });
+    equal(clone.byteLength, 1);
+    equal(ab.byteLength, 0);
+
+    clone = structuredClone(testing);
+    equal(clone.xyz, 123);
+    `,
+    sb
+  );
+
+  Cu.importGlobalProperties(["structuredClone"]);
+  const clone = structuredClone({ b: 2 });
+  Assert.equal(clone.b, 2);
+}