[es6] Align Promise.resolve with the spec

test/mjsunit/es6/promises.js

Index: test/mjsunit/es6/promises.js
diff --git a/test/mjsunit/es6/promises.js b/test/mjsunit/es6/promises.js
index 405da02b53999493215658c07cc2025ff586ac5c..341242f8d9df11c3def63ac6f393f0747bca818a 100644
--- a/test/mjsunit/es6/promises.js
+++ b/test/mjsunit/es6/promises.js
@@ -1011,9 +1011,9 @@ function assertAsyncDone(iteration) {
   log = ""
   var p4 = MyPromise.resolve(4)
   var p5 = MyPromise.reject(5)
-  assertTrue(p4 instanceof Promise, "subclass/instance4")
+  assertTrue(p4 instanceof MyPromise, "subclass/instance4")
   assertTrue(p4 instanceof MyPromise, "subclass/instance-my4")
-  assertTrue(p5 instanceof Promise, "subclass/instance5")
+  assertTrue(p5 instanceof MyPromise, "subclass/instance5")
   assertTrue(p5 instanceof MyPromise, "subclass/instance-my5")
   d3.resolve(3)
   assertTrue(log === "nx4nr5x3", "subclass/resolve")
@@ -1028,12 +1028,35 @@ function assertAsyncDone(iteration) {
 
   log = ""
   Promise.all([11, Promise.accept(12), 13, MyPromise.accept(14), 15, 16])
-  assertTrue(log === "nx14n", "subclass/all/arg")
+
+  assertTrue(log === "nx14", "subclass/all/arg")
 
   log = ""
   MyPromise.all([21, Promise.accept(22), 23, MyPromise.accept(24), 25, 26])
-  assertTrue(log === "nx24nnx21nnx23nnnx25nnx26n", "subclass/all/self")
+  assertTrue(log === "nx24nnx21nnnnx23nnnx25nnx26n", "subclass/all/self")
 })();
 
+(function() {
+  'use strict';
+
+  class Pact extends Promise { }
+  class Vow  extends Pact    { }
+  class Oath extends Vow     { }
+
+  Oath.constructor = Vow;
+
+  assertTrue(Pact.resolve(Pact.resolve()).constructor === Pact,
+             "subclass/resolve/own");
+
+  assertTrue(Pact.resolve(Promise.resolve()).constructor === Pact,
+             "subclass/resolve/ancestor");
+
+  assertTrue(Pact.resolve(Vow.resolve()).constructor === Pact,
+             "subclass/resolve/descendant"); var vow = Vow.resolve();
+
+  vow.constructor = Oath;
+  assertTrue(Oath.resolve(vow) === vow,
+             "subclass/resolve/descendant with transplanted own constructor");
+}());
 
 assertAsyncDone()