1 files changed, 20 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/proxy/testDirectProxySet7.js b/js/src/jit-test/tests/proxy/testDirectProxySet7.js
new file mode 100644
index 0000000000..9376670e4a
--- /dev/null
+++ b/js/src/jit-test/tests/proxy/testDirectProxySet7.js
@@ -0,0 +1,20 @@
+// Assigning to a proxy with no set handler calls the defineProperty handler
+// when no such property already exists.
+
+var hits = 0;
+var t = {};
+var p = new Proxy(t, {
+    defineProperty(t, id, desc) { hits++; return true; }
+});
+p.x = 1;
+assertEq(hits, 1);
+assertEq("x" in t, false);
+
+// Same thing, but the receiver is a plain object inheriting from p:
+var receiver = Object.create(p);
+hits = 0;
+receiver.x = 2;
+assertEq(hits, 0);
+assertEq("x" in t, false);
+assertEq(receiver.hasOwnProperty("x"), true);
+assertEq(receiver.x, 2);