diff --git a/test/built-ins/Promise/reject-ignored-via-fn-deferred.js b/test/built-ins/Promise/reject-ignored-via-fn-deferred.js
index 117722fa14..5c8ba3c128 100644
--- a/test/built-ins/Promise/reject-ignored-via-fn-deferred.js
+++ b/test/built-ins/Promise/reject-ignored-via-fn-deferred.js
@@ -21,6 +21,7 @@ info: >
 flags: [async]
 ---*/
 
+var returnValue = null;
 var thenable = new Promise(function() {});
 var resolve, reject;
 var p = new Promise(function(_resolve, _reject) {
@@ -35,4 +36,6 @@ p.then(function() {
   });
 
 resolve();
-reject(thenable);
+returnValue = reject(thenable);
+
+assert.sameValue(returnValue, undefined, '"reject" function return value');
diff --git a/test/built-ins/Promise/reject-ignored-via-fn-immed.js b/test/built-ins/Promise/reject-ignored-via-fn-immed.js
index 1e97f5d917..37158a6cad 100644
--- a/test/built-ins/Promise/reject-ignored-via-fn-immed.js
+++ b/test/built-ins/Promise/reject-ignored-via-fn-immed.js
@@ -21,12 +21,15 @@ info: >
 flags: [async]
 ---*/
 
+var returnValue = null;
 var thenable = new Promise(function() {});
 var p = new Promise(function(resolve, reject) {
   resolve();
-  reject(thenable);
+  returnValue = reject(thenable);
 });
 
+assert.sameValue(returnValue, undefined, '"reject" function return value');
+
 p.then(function() {
     $DONE();
   }, function() {
diff --git a/test/built-ins/Promise/reject-via-fn-deferred.js b/test/built-ins/Promise/reject-via-fn-deferred.js
index fca3fcafcb..7d90f342d8 100644
--- a/test/built-ins/Promise/reject-via-fn-deferred.js
+++ b/test/built-ins/Promise/reject-via-fn-deferred.js
@@ -18,6 +18,7 @@ flags: [async]
 ---*/
 
 var thenable = new Promise(function() {});
+var returnValue = null;
 var reject;
 var p = new Promise(function(_, _reject) {
   reject = _reject;
@@ -34,4 +35,6 @@ p.then(function() {
     $DONE();
   });
 
-reject(thenable);
+returnValue = reject(thenable);
+
+assert.sameValue(returnValue, undefined, '"reject" function return value');
diff --git a/test/built-ins/Promise/reject-via-fn-immed.js b/test/built-ins/Promise/reject-via-fn-immed.js
index 26e841f7f0..b2a927eb89 100644
--- a/test/built-ins/Promise/reject-via-fn-immed.js
+++ b/test/built-ins/Promise/reject-via-fn-immed.js
@@ -18,10 +18,13 @@ flags: [async]
 ---*/
 
 var thenable = new Promise(function() {});
+var returnValue = null;
 var p = new Promise(function(_, reject) {
-  reject(thenable);
+  returnValue = reject(thenable);
 });
 
+assert.sameValue(returnValue, undefined, '"reject" function return value');
+
 p.then(function() {
     $DONE('The promise should not be fulfilled.');
   }, function(x) {
diff --git a/test/built-ins/Promise/resolve-non-obj-deferred.js b/test/built-ins/Promise/resolve-non-obj-deferred.js
index 8e099a4723..2cc4270a7e 100644
--- a/test/built-ins/Promise/resolve-non-obj-deferred.js
+++ b/test/built-ins/Promise/resolve-non-obj-deferred.js
@@ -16,6 +16,7 @@ info: >
 flags: [async]
 ---*/
 
+var returnValue = null;
 var resolve;
 var promise = new Promise(function(_resolve) {
   resolve = _resolve;
@@ -32,4 +33,6 @@ promise.then(function(value) {
     $DONE('The promise should not be rejected.');
   });
 
-resolve(45);
+returnValue = resolve(45);
+
+assert.sameValue(returnValue, undefined, '"resolve" return value');
diff --git a/test/built-ins/Promise/resolve-non-obj-immed.js b/test/built-ins/Promise/resolve-non-obj-immed.js
index 5f65561008..b280f6f424 100644
--- a/test/built-ins/Promise/resolve-non-obj-immed.js
+++ b/test/built-ins/Promise/resolve-non-obj-immed.js
@@ -15,10 +15,13 @@ info: >
 flags: [async]
 ---*/
 
+var returnValue = null;
 var promise = new Promise(function(resolve) {
-  resolve(45);
+  returnValue = resolve(45);
 });
 
+assert.sameValue(returnValue, undefined, '"resolve" return value');
+
 promise.then(function(value) {
     if (value !== 45) {
       $DONE('The promise should be fulfilled with the provided value.');
diff --git a/test/built-ins/Promise/resolve-non-thenable-deferred.js b/test/built-ins/Promise/resolve-non-thenable-deferred.js
index d3b93474a7..a9781f8879 100644
--- a/test/built-ins/Promise/resolve-non-thenable-deferred.js
+++ b/test/built-ins/Promise/resolve-non-thenable-deferred.js
@@ -21,6 +21,7 @@ info: >
 flags: [async]
 ---*/
 
+var returnValue = null;
 var nonThenable = { then: null };
 var resolve;
 var promise = new Promise(function(_resolve) {
@@ -38,4 +39,6 @@ promise.then(function(value) {
     $DONE('The promise should not be rejected.');
   });
 
-resolve(nonThenable);
+returnValue = resolve(nonThenable);
+
+assert.sameValue(returnValue, undefined, '"resolve" return value');
diff --git a/test/built-ins/Promise/resolve-non-thenable-immed.js b/test/built-ins/Promise/resolve-non-thenable-immed.js
index 74161789f1..c20bb9ffc6 100644
--- a/test/built-ins/Promise/resolve-non-thenable-immed.js
+++ b/test/built-ins/Promise/resolve-non-thenable-immed.js
@@ -21,11 +21,14 @@ info: >
 flags: [async]
 ---*/
 
+var returnValue = null;
 var nonThenable = { then: null };
 var promise = new Promise(function(resolve) {
-  resolve(nonThenable);
+  returnValue = resolve(nonThenable);
 });
 
+assert.sameValue(returnValue, undefined, '"resolve" return value');
+
 promise.then(function(value) {
     if (value !== nonThenable) {
       $DONE('The promise should be fulfilled with the provided value.');
diff --git a/test/built-ins/Promise/resolve-poisoned-then-deferred.js b/test/built-ins/Promise/resolve-poisoned-then-deferred.js
index d043a5ddd4..d8cd67487b 100644
--- a/test/built-ins/Promise/resolve-poisoned-then-deferred.js
+++ b/test/built-ins/Promise/resolve-poisoned-then-deferred.js
@@ -17,6 +17,7 @@ info: >
 flags: [async]
 ---*/
 
+var returnValue = null;
 var value = {};
 var resolve;
 var poisonedThen = Object.defineProperty({}, 'then', {
@@ -39,4 +40,6 @@ promise.then(function() {
     $DONE();
   });
 
-resolve(poisonedThen);
+returnValue = resolve(poisonedThen);
+
+assert.sameValue(returnValue, undefined, '"resolve" return value');
diff --git a/test/built-ins/Promise/resolve-poisoned-then-immed.js b/test/built-ins/Promise/resolve-poisoned-then-immed.js
index 90c678e496..11a3eee160 100644
--- a/test/built-ins/Promise/resolve-poisoned-then-immed.js
+++ b/test/built-ins/Promise/resolve-poisoned-then-immed.js
@@ -17,6 +17,7 @@ info: >
 flags: [async]
 ---*/
 
+var returnValue = null;
 var value = {};
 var poisonedThen = Object.defineProperty({}, 'then', {
   get: function() {
@@ -24,9 +25,11 @@ var poisonedThen = Object.defineProperty({}, 'then', {
   }
 });
 var promise = new Promise(function(resolve) {
-  resolve(poisonedThen);
+  returnValue = resolve(poisonedThen);
 });
 
+assert.sameValue(returnValue, undefined, '"resolve" return value');
+
 promise.then(function() {
     $DONE('The promise should not be fulfilled.');
   }, function(val) {
diff --git a/test/built-ins/Promise/resolve-prms-cstm-then-deferred.js b/test/built-ins/Promise/resolve-prms-cstm-then-deferred.js
index 6ebe0c8a71..a7c0eca492 100644
--- a/test/built-ins/Promise/resolve-prms-cstm-then-deferred.js
+++ b/test/built-ins/Promise/resolve-prms-cstm-then-deferred.js
@@ -23,6 +23,7 @@ info: >
         «promise, resolution, thenAction»)
 ---*/
 
+var returnValue = null;
 var value = {};
 var resolve;
 var thenable = new Promise(function(resolve) { resolve(); });
@@ -45,4 +46,6 @@ promise.then(function(val) {
     $DONE('The promise should not be rejected.');
   });
 
-resolve(thenable);
+returnValue = resolve(thenable);
+
+assert.sameValue(returnValue, undefined, '"resolve" return value');
diff --git a/test/built-ins/Promise/resolve-prms-cstm-then-immed.js b/test/built-ins/Promise/resolve-prms-cstm-then-immed.js
index c4312b50ec..7c2794a7dd 100644
--- a/test/built-ins/Promise/resolve-prms-cstm-then-immed.js
+++ b/test/built-ins/Promise/resolve-prms-cstm-then-immed.js
@@ -23,6 +23,7 @@ info: >
         «promise, resolution, thenAction»)
 ---*/
 
+var returnValue = null;
 var value = {};
 var lateCallCount = 0;
 var thenable = new Promise(function(resolve) { resolve(); });
@@ -32,9 +33,11 @@ thenable.then = function(resolve) {
 };
 
 var promise = new Promise(function(resolve) {
-  resolve(thenable);
+  returnValue = resolve(thenable);
 });
 
+assert.sameValue(returnValue, undefined, '"resolve" return value');
+
 thenable.then = function() {
   lateCallCount += 1;
 };
diff --git a/test/built-ins/Promise/resolve-self.js b/test/built-ins/Promise/resolve-self.js
index cd9d988ac1..23ae636fac 100644
--- a/test/built-ins/Promise/resolve-self.js
+++ b/test/built-ins/Promise/resolve-self.js
@@ -17,6 +17,7 @@ info: >
 flags: [async]
 ---*/
 
+var returnValue = null;
 var resolve;
 var promise = new Promise(function(_resolve) {
   resolve = _resolve;
@@ -38,4 +39,6 @@ promise.then(function() {
     $DONE();
   });
 
-resolve(promise);
+returnValue = resolve(promise);
+
+assert.sameValue(returnValue, undefined, '"resolve" return value');
diff --git a/test/built-ins/Promise/resolve-thenable-deferred.js b/test/built-ins/Promise/resolve-thenable-deferred.js
index cd572d1a84..6880ec067e 100644
--- a/test/built-ins/Promise/resolve-thenable-deferred.js
+++ b/test/built-ins/Promise/resolve-thenable-deferred.js
@@ -24,6 +24,7 @@ info: >
 flags: [async]
 ---*/
 
+var returnValue = null;
 var value = {};
 var resolve;
 var thenable = new Promise(function(resolve) { resolve(value); });
@@ -42,4 +43,6 @@ promise.then(function(val) {
     $DONE('The promise should not be rejected.');
   });
 
-resolve(thenable);
+returnValue = resolve(thenable);
+
+assert.sameValue(returnValue, undefined, '"resolve" return value');
diff --git a/test/built-ins/Promise/resolve-thenable-immed.js b/test/built-ins/Promise/resolve-thenable-immed.js
index f0412ed71a..baafa1a41c 100644
--- a/test/built-ins/Promise/resolve-thenable-immed.js
+++ b/test/built-ins/Promise/resolve-thenable-immed.js
@@ -23,12 +23,15 @@ info: >
 flags: [async]
 ---*/
 
+var returnValue = null;
 var value = {};
 var thenable = new Promise(function(resolve) { resolve(value); });
 var promise = new Promise(function(resolve) {
-  resolve(thenable);
+  returnValue = resolve(thenable);
 });
 
+assert.sameValue(returnValue, undefined, '"resolve" return value');
+
 promise.then(function(val) {
     if (val !== value) {
       $DONE('The promise should be fulfilled with the provided value.');