1 files changed, 111 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/Class/extendBuiltinConstructors.js b/js/src/tests/ecma_6/Class/extendBuiltinConstructors.js
new file mode 100644
index 000000000..480dd7b57
--- /dev/null
+++ b/js/src/tests/ecma_6/Class/extendBuiltinConstructors.js
@@ -0,0 +1,111 @@
+function testBuiltinInstanceIsInstanceOf(instance, builtin, class_) {
+    assertEq(instance instanceof class_, true);
+    assertEq(instance instanceof builtin, true);
+
+    if (builtin === Array)
+        assertEq(Array.isArray(instance), true);
+}
+
+function testBuiltinInstance(builtin, ...args) {
+    class sub extends builtin {
+        constructor(...args) {
+            super(...args);
+            this.called = true;
+        }
+    }
+
+    let instance = new sub(...args);
+    assertEq(instance.called, true);
+    testBuiltinInstanceIsInstanceOf(instance, builtin, sub);
+}
+
+function testBuiltinMultipleSubclasses(builtin, ...args) {
+    function f(obj, prop) {
+        assertEq(obj.prop, prop);
+    }
+
+    class sub1 extends builtin { };
+    class sub2 extends builtin { };
+
+    const prop1 = "A";
+    const prop2 = "B";
+
+    sub1.prototype.prop = prop1;
+    sub2.prototype.prop = prop2;
+
+    let instance1 = new sub1(...args);
+    let instance2 = new sub2(...args);
+
+    // Also make sure we get the properties we want with a default constructor
+    testBuiltinInstanceIsInstanceOf(instance1, builtin, sub1);
+
+    for (let i = 0; i < 10; i++) {
+        f(instance1, prop1);
+        f(instance2, prop2);
+    }
+}
+
+function testBuiltin(builtin, ...args) {
+    testBuiltinInstance(builtin, ...args);
+    testBuiltinMultipleSubclasses(builtin, ...args);
+}
+
+function testBuiltinTypedArrays() {
+    let typedArrays = [Int8Array,
+                       Uint8Array,
+                       Uint8ClampedArray,
+                       Int16Array,
+                       Uint16Array,
+                       Int32Array,
+                       Uint32Array,
+                       Float32Array,
+                       Float64Array];
+
+    for (let array of typedArrays) {
+        testBuiltin(array);
+        testBuiltin(array, 5);
+        testBuiltin(array, new array());
+        testBuiltin(array, new ArrayBuffer());
+    }
+}
+
+testBuiltin(Function);
+testBuiltin(Object);
+testBuiltin(Boolean);
+testBuiltin(Error);
+testBuiltin(EvalError);
+testBuiltin(RangeError);
+testBuiltin(ReferenceError);
+testBuiltin(SyntaxError);
+testBuiltin(TypeError);
+testBuiltin(URIError);
+testBuiltin(Number);
+testBuiltin(Date);
+testBuiltin(Date, 5);
+testBuiltin(Date, 5, 10);
+testBuiltin(RegExp);
+testBuiltin(RegExp, /Regexp Argument/);
+testBuiltin(RegExp, "String Argument");
+testBuiltin(Map);
+testBuiltin(Set);
+testBuiltin(WeakMap);
+testBuiltin(WeakSet);
+testBuiltin(ArrayBuffer);
+testBuiltinTypedArrays();
+testBuiltin(DataView, new ArrayBuffer());
+testBuiltin(DataView, new (newGlobal().ArrayBuffer)());
+testBuiltin(String);
+testBuiltin(Array);
+testBuiltin(Array, 15);
+testBuiltin(Array, 3.0);
+testBuiltin(Array, "non-length one-arg");
+testBuiltin(Array, 5, 10, 15, "these are elements");
+// More Promise subclassing tests can be found in ecma_6/Promise/promise-subclassing.js
+if (typeof Promise !== "undefined")
+    testBuiltin(Promise, _=>{});
+
+if (this.SharedArrayBuffer)
+    testBuiltin(SharedArrayBuffer);
+
+if (typeof reportCompare === 'function')
+    reportCompare(0,0,"OK");