1 files changed, 27 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/pic/watch5.js b/js/src/jit-test/tests/pic/watch5.js
new file mode 100644
index 000000000..6b22951a4
--- /dev/null
+++ b/js/src/jit-test/tests/pic/watch5.js
@@ -0,0 +1,27 @@
+// test against future pic support for symbols
+
+// assignments to watched objects must not be cached
+var obj = {};
+var x = Symbol.for("x");
+obj[x] = 0;
+var hits = 0;
+obj.watch(x, function (id, oldval, newval) { hits++; return newval; });
+for (var i = 0; i < 10; i++)
+    obj[x] = i;
+assertEq(hits, 10);
+
+// assignments to watched properties via ++ must not be cached
+hits = 0;
+for (var i = 0; i < 10; i++)
+    obj[x]++;
+assertEq(hits, 10);
+
+// adding assignment + watchpoint vs. caching
+hits = 0;
+obj = {};
+obj.watch(x, function (id, oldval, newval) { hits++; return newval; });
+for (var i = 0; i < 10; i++) {
+    obj[x] = 1;
+    delete obj[x];
+}
+assertEq(hits, 10);