1 files changed, 36 insertions, 0 deletions
diff --git a/js/src/tests/non262/Array/join-no-has-trap.js b/js/src/tests/non262/Array/join-no-has-trap.js
new file mode 100644
index 0000000000..16b8cbedb1
--- /dev/null
+++ b/js/src/tests/non262/Array/join-no-has-trap.js
@@ -0,0 +1,36 @@
+// Test that Array.prototype.join doesn't call the [[HasProperty]] internal
+// method of objects.
+
+var log = [];
+var array = [];
+var proxy = new Proxy(array, new Proxy({}, {
+    get(t, trap, r) {
+      return (t, pk, ...more) => {
+        log.push(`${trap}:${String(pk)}`);
+        return Reflect[trap](t, pk, ...more);
+      };
+    }
+}));
+
+var result;
+
+result = Array.prototype.join.call(proxy);
+assertEqArray(log, [ "get:length" ]);
+assertEq(result, "");
+
+log.length = 0;
+array.push(1);
+
+result = Array.prototype.join.call(proxy);
+assertEqArray(log, [ "get:length", "get:0" ]);
+assertEq(result, "1");
+
+log.length = 0;
+array.push(2);
+
+result = Array.prototype.join.call(proxy);
+assertEqArray(log, [ "get:length", "get:0", "get:1" ]);
+assertEq(result, "1,2");
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);