1 files changed, 37 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/Class/boundFunctionSubclassing.js b/js/src/tests/ecma_6/Class/boundFunctionSubclassing.js
new file mode 100644
index 000000000..be9058bb9
--- /dev/null
+++ b/js/src/tests/ecma_6/Class/boundFunctionSubclassing.js
@@ -0,0 +1,37 @@
+class func extends Function { }
+let inst = new func("x", "return this.bar + x");
+
+// First, ensure that we get sane prototype chains for the bound instance
+let bound = inst.bind({bar: 3}, 4);
+assertEq(bound instanceof func, true);
+assertEq(bound(), 7);
+
+// Check the corner case for Function.prototype.bind where the function has
+// a null [[Prototype]]
+Object.setPrototypeOf(inst, null);
+bound = Function.prototype.bind.call(inst, {bar:1}, 3);
+assertEq(Object.getPrototypeOf(bound), null);
+assertEq(bound(), 4);
+
+// Check that we actually pass the proper new.target when calling super()
+function toBind() { }
+
+var boundArgs = [];
+for (let i = 0; i < 5; i++) {
+    boundArgs.push(i);
+    let bound = toBind.bind(undefined, ...boundArgs);
+
+    // We have to wire it up by hand to allow us to use a bound function
+    // as a superclass, but it's doable.
+    bound.prototype = {};
+    class test extends bound { };
+    let passedArgs = [];
+    for (let j = 0; j < 15; j++) {
+        passedArgs.push(j);
+        assertEq(Object.getPrototypeOf(new test(...passedArgs)), test.prototype);
+    }
+}
+
+
+if (typeof reportCompare === 'function')
+    reportCompare(0,0,"OK");