1 files changed, 40 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/sharedbuf/growable-sab-over-mailbox.js b/js/src/jit-test/tests/sharedbuf/growable-sab-over-mailbox.js
new file mode 100644
index 0000000000..3ffb29cc3d
--- /dev/null
+++ b/js/src/jit-test/tests/sharedbuf/growable-sab-over-mailbox.js
@@ -0,0 +1,40 @@
+// |jit-test| --enable-arraybuffer-resizable; skip-if: !this.SharedArrayBuffer?.prototype?.grow
+
+var gsab = new SharedArrayBuffer(4, {maxByteLength: 16});
+
+// Test byte lengths are correct.
+assertEq(gsab.byteLength, 4);
+assertEq(gsab.maxByteLength, 16);
+
+// Pass |gsab| to the mailbox.
+setSharedObject(gsab);
+
+// Retrieve again from the mailbox to create a new growable shared array buffer
+// which points to the same memory.
+var gsab2 = getSharedObject();
+
+assertEq(gsab !== gsab2, true, "different objects expected");
+
+// Byte lengths are correct for both objects.
+assertEq(gsab.byteLength, 4);
+assertEq(gsab.maxByteLength, 16);
+assertEq(gsab2.byteLength, 4);
+assertEq(gsab2.maxByteLength, 16);
+
+// Grow the original object.
+gsab.grow(6);
+
+// Byte lengths are correct for both objects.
+assertEq(gsab.byteLength, 6);
+assertEq(gsab.maxByteLength, 16);
+assertEq(gsab2.byteLength, 6);
+assertEq(gsab2.maxByteLength, 16);
+
+// Grow the copy.
+gsab2.grow(8);
+
+// Byte lengths are correct for both objects.
+assertEq(gsab.byteLength, 8);
+assertEq(gsab.maxByteLength, 16);
+assertEq(gsab2.byteLength, 8);
+assertEq(gsab2.maxByteLength, 16);