Promises: make null a legal argument for .then

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 b5137931003ca397f0d116b95ef4e90921cebd7a..f1b191c2c6420c4f379e884ff1ff7813be160cc7 100644
--- a/test/mjsunit/es6/promises.js
+++ b/test/mjsunit/es6/promises.js
@@ -100,7 +100,12 @@ function assertAsyncDone(iteration) {
 
 (function() {
   Promise.resolve(5).then(undefined, assertUnreachable).chain(
-    function(x) { assertAsync(x === 5, "resolved/then-nohandler") },
+    function(x) { assertAsync(x === 5, "resolved/then-nohandler-undefined") },
+    assertUnreachable
+  )
+  assertAsyncRan()
+  Promise.resolve(6).then(null, assertUnreachable).chain(
+    function(x) { assertAsync(x === 6, "resolved/then-nohandler-null") },
     assertUnreachable
   )
   assertAsyncRan()
@@ -109,7 +114,12 @@ function assertAsyncDone(iteration) {
 (function() {
   Promise.reject(5).then(assertUnreachable, undefined).chain(
     assertUnreachable,
-    function(r) { assertAsync(r === 5, "rejected/then-nohandler") }
+    function(r) { assertAsync(r === 5, "rejected/then-nohandler-undefined") }
+  )
+  assertAsyncRan()
+  Promise.reject(6).then(assertUnreachable, null).chain(
+    assertUnreachable,
+    function(r) { assertAsync(r === 6, "rejected/then-nohandler-null") }
   )
   assertAsyncRan()
 })();