Add more tests for Promise resolution

Ensure that resolution is ignored for Promises that have already been
rejected.

test/built-ins/Promise/resolve-ignored-via-fn-deferred.js

@@ -0,0 +1,42 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: >
+    Rejected promises ignore resolution after deferred invocation of the
+    provided reject function
+esid: sec-promise-executor
+es6id: 25.4.3.1
+info: >
+    [...]
+    9. Let completion be Call(executor, undefined,
+       «resolvingFunctions.[[Resolve]], resolvingFunctions.[[Reject]]»).
+    10. If completion is an abrupt completion, then
+        [...]
+    11. Return promise.
+
+    25.4.1.3.2 Promise Resolve Functions
+
+    [...]
+    3. Let alreadyResolved be F.[[AlreadyResolved]].
+    4. If alreadyResolved.[[Value]] is true, return undefined.
+flags: [async]
+---*/
+
+var returnValue = null;
+var thenable = new Promise(function() {});
+var resolve, reject;
+var p = new Promise(function(_resolve, _reject) {
+  resolve = _resolve;
+  reject = _reject;
+});
+
+p.then(function() {
+    $DONE('The promise should not be fulfilled.');
+  }, function() {
+    $DONE();
+  });
+
+reject(thenable);
+returnValue = resolve();
+
+assert.sameValue(returnValue, undefined, '"resolve" function return value');

test/built-ins/Promise/resolve-ignored-via-fn-immed.js

@@ -0,0 +1,38 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: >
+    Rejected promises ignore resolution after immediate invocation of the
+    provided reject function
+esid: sec-promise-executor
+es6id: 25.4.3.3
+info: >
+    [...]
+    9. Let completion be Call(executor, undefined,
+       «resolvingFunctions.[[Resolve]], resolvingFunctions.[[Reject]]»).
+    10. If completion is an abrupt completion, then
+        [...]
+    11. Return promise.
+
+    25.4.1.3.2 Promise Resolve Functions
+
+    [...]
+    3. Let alreadyResolved be F.[[AlreadyResolved]].
+    4. If alreadyResolved.[[Value]] is true, return undefined.
+flags: [async]
+---*/
+
+var returnValue = null;
+var thenable = new Promise(function() {});
+var p = new Promise(function(resolve, reject) {
+  reject(thenable);
+  returnValue = resolve();
+});
+
+assert.sameValue(returnValue, undefined, '"reject" function return value');
+
+p.then(function() {
+    $DONE('The promise should not be fulfilled.');
+  }, function() {
+    $DONE();
+  });