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+// Copyright 2013 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Test aspects of the generator runtime.
+
+// See:
+// http://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorfunction-objects
+
+function f() { }
+function* g() { yield 1; }
+var GeneratorFunctionPrototype = Object.getPrototypeOf(g);
+var GeneratorFunction = GeneratorFunctionPrototype.constructor;
+var GeneratorObjectPrototype = GeneratorFunctionPrototype.prototype;
+
+// A generator function should have the same set of properties as any
+// other function.
+function TestGeneratorFunctionInstance() {
+  var f_own_property_names = Object.getOwnPropertyNames(f);
+  var g_own_property_names = Object.getOwnPropertyNames(g);
+
+  f_own_property_names.sort();
+  g_own_property_names.sort();
+
+  assertArrayEquals(f_own_property_names, g_own_property_names);
+  var i;
+  for (i = 0; i < f_own_property_names.length; i++) {
+    var prop = f_own_property_names[i];
+    var f_desc = Object.getOwnPropertyDescriptor(f, prop);
+    var g_desc = Object.getOwnPropertyDescriptor(g, prop);
+    assertEquals(f_desc.configurable, g_desc.configurable, prop);
+    if (prop === 'arguments' || prop === 'caller') {
+      // Unlike sloppy functions, which have read-only data arguments and caller
+      // properties, sloppy generators have a poison pill implemented via
+      // accessors
+      assertFalse('writable' in g_desc, prop);
+      assertTrue(g_desc.get instanceof Function, prop);
+      assertEquals(g_desc.get, g_desc.set, prop);
+    } else {
+      assertEquals(f_desc.writable, g_desc.writable, prop);
+    }
+    assertEquals(f_desc.enumerable, g_desc.enumerable, prop);
+  }
+}
+TestGeneratorFunctionInstance();
+
+
+// Generators have an additional object interposed in the chain between
+// themselves and Function.prototype.
+function TestGeneratorFunctionPrototype() {
+  // Sanity check.
+  assertSame(Object.getPrototypeOf(f), Function.prototype);
+  assertFalse(GeneratorFunctionPrototype === Function.prototype);
+  assertSame(Function.prototype,
+             Object.getPrototypeOf(GeneratorFunctionPrototype));
+  assertSame(GeneratorFunctionPrototype,
+             Object.getPrototypeOf(function* () {}));
+}
+TestGeneratorFunctionPrototype();
+
+
+// Functions that we associate with generator objects are actually defined by
+// a common prototype.
+function TestGeneratorObjectPrototype() {
+  assertSame(Object.prototype,
+             Object.getPrototypeOf(GeneratorObjectPrototype));
+  assertSame(GeneratorObjectPrototype,
+             Object.getPrototypeOf((function*(){yield 1}).prototype));
+
+  var expected_property_names = ["next", "throw", "constructor"];
+  var found_property_names =
+      Object.getOwnPropertyNames(GeneratorObjectPrototype);
+
+  expected_property_names.sort();
+  found_property_names.sort();
+
+  assertArrayEquals(expected_property_names, found_property_names);
+
+  iterator_desc = Object.getOwnPropertyDescriptor(GeneratorObjectPrototype,
+      Symbol.iterator);
+  assertTrue(iterator_desc !== undefined);
+  assertFalse(iterator_desc.writable);
+  assertFalse(iterator_desc.enumerable);
+  assertFalse(iterator_desc.configurable);
+
+  // The generator object's "iterator" function is just the identity.
+  assertSame(iterator_desc.value.call(42), 42);
+}
+TestGeneratorObjectPrototype();
+
+
+// This tests the object that would be called "GeneratorFunction", if it were
+// like "Function".
+function TestGeneratorFunction() {
+  assertSame(GeneratorFunctionPrototype, GeneratorFunction.prototype);
+  assertTrue(g instanceof GeneratorFunction);
+
+  assertSame(Function, Object.getPrototypeOf(GeneratorFunction));
+  assertTrue(g instanceof Function);
+
+  assertEquals("function* g() { yield 1; }", g.toString());
+
+  // Not all functions are generators.
+  assertTrue(f instanceof Function);  // Sanity check.
+  assertTrue(!(f instanceof GeneratorFunction));
+
+  assertTrue((new GeneratorFunction()) instanceof GeneratorFunction);
+  assertTrue(GeneratorFunction() instanceof GeneratorFunction);
+}
+TestGeneratorFunction();
+
+
+function TestPerGeneratorPrototype() {
+  assertTrue((function*(){}).prototype !== (function*(){}).prototype);
+  assertTrue((function*(){}).prototype !== g.prototype);
+  assertTrue(g.prototype instanceof GeneratorFunctionPrototype);
+  assertSame(GeneratorObjectPrototype, Object.getPrototypeOf(g.prototype));
+  assertTrue(!(g.prototype instanceof Function));
+  assertSame(typeof (g.prototype), "object");
+
+  assertArrayEquals([], Object.getOwnPropertyNames(g.prototype));
+}
+TestPerGeneratorPrototype();