new file mode 100644
--- /dev/null
+++ b/js/src/tests/ecma_7/AsyncFunctions/length.js
@@ -0,0 +1,19 @@
+var BUGNUMBER = 1185106;
+var summary = "async function length";
+
+print(BUGNUMBER + ": " + summary);
+
+var test = `
+
+assertEq(async function() {}.length, 0);
+assertEq(async function(a) {}.length, 1);
+assertEq(async function(a, b, c) {}.length, 3);
+assertEq(async function(a, b, c, ...d) {}.length, 3);
+
+`;
+
+if (asyncFunctionsEnabled())
+    eval(test);
+
+if (typeof reportCompare === "function")
+    reportCompare(true, true);