Read internal properties [[PromiseStatus]] and [[PromiseValue]] of the promise.

test/mjsunit/es6/mirror-promises.js

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --expose-debug-as debug --harmony-promises
 // Test the mirror object for promises.
 
 function MirrorRefCache(json_refs) {
   var tmp = eval('(' + json_refs + ')');
   this.refs_ = [];
@@ skipping 49 matching lines @@
 testPromiseMirror(rejected, "rejected", undefined);
 testPromiseMirror(pending, "pending", undefined);
 
 var resolvedv = new Promise(function(resolve, reject) { resolve('resolve') });
 var rejectedv = new Promise(function(resolve, reject) { reject('reject') });
 var thrownv = new Promise(function(resolve, reject) { throw 'throw' });
 
 testPromiseMirror(resolvedv, "resolved", 'resolve');
 testPromiseMirror(rejectedv, "rejected", 'reject');
 testPromiseMirror(thrownv, "rejected", 'throw');
+
+// Test internal properties of different promises.
+var m1 = debug.MakeMirror(new Promise(function(resolve, reject) { resolve(1) }));
+var ip = m1.internalProperties();
+assertEquals(2, ip.length);
+assertEquals("[[Status]]", ip[0].name());
+assertEquals("[[Value]]", ip[1].name());
+assertEquals("resolved", ip[0].value().value());
+assertEquals(1, ip[1].value().value());
+
+var m2 = debug.MakeMirror(new Promise(function(resolve, reject) { reject(2) }));
+ip = m2.internalProperties();
+assertEquals("rejected", ip[0].value().value());
+assertEquals(2, ip[1].value().value());
+
+var m3 = debug.MakeMirror(new Promise(function(resolve, reject) { }));
+ip = m3.internalProperties();
+assertEquals("pending", ip[0].value().value());
+assertEquals("undefined", typeof(ip[1].value().value()));