diff --git a/harness/asyncHelpers.js b/harness/asyncHelpers.js
index 904b50aa98..c8e58457fc 100644
--- a/harness/asyncHelpers.js
+++ b/harness/asyncHelpers.js
@@ -28,84 +28,86 @@ function asyncTest(testFunc) {
   }
 }
 
-assert.throwsAsync = async function (expectedErrorConstructor, func, message) {
-  var innerThenable;
-  if (message === undefined) {
-    message = "";
-  } else {
-    message += " ";
-  }
-  if (typeof func === "function") {
-    try {
-      innerThenable = func();
-      if (
-        innerThenable === null ||
-        typeof innerThenable !== "object" ||
-        typeof innerThenable.then !== "function"
-      ) {
-        message +=
-          "Expected to obtain an inner promise that would reject with a" +
-          expectedErrorConstructor.name +
-          " but result was not a thenable";
-        throw new Test262Error(message);
-      }
-    } catch (thrown) {
-      message +=
-        "Expected a " +
-        expectedErrorConstructor.name +
-        " to be thrown asynchronously but an exception was thrown synchronously while obtaining the inner promise";
-      throw new Test262Error(message);
+assert.throwsAsync = function (expectedErrorConstructor, func, message) {
+  return new Promise(function (resolve) {
+    var innerThenable;
+    if (message === undefined) {
+      message = "";
+    } else {
+      message += " ";
     }
-  } else {
-    message +=
-      "assert.throwsAsync called with an argument that is not a function";
-    throw new Test262Error(message);
-  }
-
-  try {
-    return innerThenable.then(
-      function () {
+    if (typeof func === "function") {
+      try {
+        innerThenable = func();
+        if (
+          innerThenable === null ||
+          typeof innerThenable !== "object" ||
+          typeof innerThenable.then !== "function"
+        ) {
+          message +=
+            "Expected to obtain an inner promise that would reject with a" +
+            expectedErrorConstructor.name +
+            " but result was not a thenable";
+          throw new Test262Error(message);
+        }
+      } catch (thrown) {
         message +=
           "Expected a " +
           expectedErrorConstructor.name +
-          " to be thrown asynchronously but no exception was thrown at all";
+          " to be thrown asynchronously but an exception was thrown synchronously while obtaining the inner promise";
         throw new Test262Error(message);
-      },
-      function (thrown) {
-        var expectedName, actualName;
-        if (typeof thrown !== "object" || thrown === null) {
-          message += "Thrown value was not an object!";
-          throw new Test262Error(message);
-        } else if (thrown.constructor !== expectedErrorConstructor) {
-          expectedName = expectedErrorConstructor.name;
-          actualName = thrown.constructor.name;
-          if (expectedName === actualName) {
-            message +=
-              "Expected a " +
-              expectedName +
-              " but got a different error constructor with the same name";
-          } else {
-            message +=
-              "Expected a " + expectedName + " but got a " + actualName;
-          }
-          throw new Test262Error(message);
-        }
       }
-    );
-  } catch (thrown) {
-    if (typeof thrown !== "object" || thrown === null) {
-      message +=
-        "Expected a " +
-        expectedErrorConstructor.name +
-        " to be thrown asynchronously but innerThenable synchronously threw a value that was not an object ";
     } else {
       message +=
-        "Expected a " +
-        expectedErrorConstructor.name +
-        " to be thrown asynchronously but a " +
-        thrown.constructor.name +
-        " was thrown synchronously";
+        "assert.throwsAsync called with an argument that is not a function";
+      throw new Test262Error(message);
     }
-    throw new Test262Error(message);
-  }
+
+    try {
+      resolve(innerThenable.then(
+        function () {
+          message +=
+            "Expected a " +
+            expectedErrorConstructor.name +
+            " to be thrown asynchronously but no exception was thrown at all";
+          throw new Test262Error(message);
+        },
+        function (thrown) {
+          var expectedName, actualName;
+          if (typeof thrown !== "object" || thrown === null) {
+            message += "Thrown value was not an object!";
+            throw new Test262Error(message);
+          } else if (thrown.constructor !== expectedErrorConstructor) {
+            expectedName = expectedErrorConstructor.name;
+            actualName = thrown.constructor.name;
+            if (expectedName === actualName) {
+              message +=
+                "Expected a " +
+                expectedName +
+                " but got a different error constructor with the same name";
+            } else {
+              message +=
+                "Expected a " + expectedName + " but got a " + actualName;
+            }
+            throw new Test262Error(message);
+          }
+        }
+      ));
+    } catch (thrown) {
+      if (typeof thrown !== "object" || thrown === null) {
+        message +=
+          "Expected a " +
+          expectedErrorConstructor.name +
+          " to be thrown asynchronously but innerThenable synchronously threw a value that was not an object ";
+      } else {
+        message +=
+          "Expected a " +
+          expectedErrorConstructor.name +
+          " to be thrown asynchronously but a " +
+          thrown.constructor.name +
+          " was thrown synchronously";
+      }
+      throw new Test262Error(message);
+    }
+  });
 };
diff --git a/test/built-ins/Promise/try/args.js b/test/built-ins/Promise/try/args.js
index 225ddd42ce..4a75c3aca4 100644
--- a/test/built-ins/Promise/try/args.js
+++ b/test/built-ins/Promise/try/args.js
@@ -11,12 +11,12 @@ includes: [asyncHelpers.js, compareArray.js]
 
 var sentinel = { sentinel: true };
 
-asyncTest(
-  Promise.try(function () {
+asyncTest(function () {
+  return Promise.try(function () {
     assert.compareArray(
       Array.prototype.slice.call(arguments),
       [1, 2, Test262Error, sentinel]
     );
   }, 1, 2, Test262Error, sentinel)
-);
+});
 
diff --git a/test/built-ins/Promise/try/ctx-ctor.js b/test/built-ins/Promise/try/ctx-ctor.js
index 45a1391d48..06e1069347 100644
--- a/test/built-ins/Promise/try/ctx-ctor.js
+++ b/test/built-ins/Promise/try/ctx-ctor.js
@@ -20,8 +20,8 @@ class SubPromise extends Promise {
 
 var instance = Promise.try.call(SubPromise, function () {});
 
-assert.sameValue(instance.promise.constructor, SubPromise);
-assert.sameValue(instance.promise instanceof SubPromise, true);
+assert.sameValue(instance.constructor, SubPromise);
+assert.sameValue(instance instanceof SubPromise, true);
 
 assert.sameValue(callCount, 1);
 assert.sameValue(typeof executor, 'function');
diff --git a/test/built-ins/Promise/try/return-value.js b/test/built-ins/Promise/try/return-value.js
index 7859051913..6f1ef2a7e8 100644
--- a/test/built-ins/Promise/try/return-value.js
+++ b/test/built-ins/Promise/try/return-value.js
@@ -11,11 +11,11 @@ includes: [asyncHelpers.js]
 
 var sentinel = { sentinel: true };
 
-asyncTest(
-  Promise.try(function () {
+asyncTest(function() {
+  return Promise.try(function () {
     return sentinel;
   }).then(function (v) {
     assert.sameValue(v, sentinel);
   })
-);
+});
 
diff --git a/test/built-ins/Promise/try/throws.js b/test/built-ins/Promise/try/throws.js
index ad7f56622d..9dc211490f 100644
--- a/test/built-ins/Promise/try/throws.js
+++ b/test/built-ins/Promise/try/throws.js
@@ -6,12 +6,15 @@ description: Promise.try returns a Promise that rejects when the function throws
 esid: sec-promise.try
 features: [promise-try]
 flags: [async]
+includes: [asyncHelpers.js]
 ---*/
 
-assert.throwsAsync(
-  Test262Error,
-  function () {
-    Promise.try(function () { throw new Test262Error(); })
-  },
-  "error thrown from callback must become a rejection"
-);
+asyncTest(function () {
+  return assert.throwsAsync(
+    Test262Error,
+    function () {
+      return Promise.try(function () { throw new Test262Error(); })
+    },
+    "error thrown from callback must become a rejection"
+  );
+});
diff --git a/test/staging/explicit-resource-management/disposable-stack-adopt-and-defer.js b/test/staging/explicit-resource-management/disposable-stack-adopt-and-defer.js
new file mode 100644
index 0000000000..8835a7bb48
--- /dev/null
+++ b/test/staging/explicit-resource-management/disposable-stack-adopt-and-defer.js
@@ -0,0 +1,84 @@
+// Copyright (C) 2024 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: |
+  Test developer exposed DisposableStack protype methods adopt() and defer().
+includes: [compareArray.js]
+features: [explicit-resource-management]
+---*/
+
+// adopt() method on disposed stack --------
+function TestDisposableStackAdoptOnDisposedStack() {
+    let stack = new DisposableStack();
+    stack.dispose();
+    stack.adopt(42, function(v) {return v});
+  };
+  assert.throws(
+      ReferenceError, () => TestDisposableStackUseOnDisposedStack(),
+      'Cannot add values to a disposed stack!');
+
+// adopt() method when onDispose is not callable--------
+function TestDisposableStackAdoptWithNonCallableOnDispose() {
+  let stack = new DisposableStack();
+  stack.adopt(42, 43);
+};
+assert.throws(
+    TypeError, () => TestDisposableStackAdoptWithNonCallableOnDispose(),
+    'onDispose is not callable');
+
+// adopt() method --------
+let valuesNormal = [];
+
+(function TestDisposableStackAdopt() {
+  let stack = new DisposableStack();
+  stack.adopt(42, function(v) {valuesNormal.push(v)});
+  const disposable = {
+    value: 1,
+    [Symbol.dispose]() {
+      valuesNormal.push(43);
+    }
+  };
+  stack.use(disposable);
+  stack.adopt(44, function(v) {valuesNormal.push(v)});
+  stack.dispose();
+})();
+assert.compareArray(valuesNormal, [44, 43, 42]);
+
+// defer() method on disposed stack --------
+function TestDisposableStackDeferOnDisposedStack() {
+  let stack = new DisposableStack();
+  stack.dispose();
+  stack.defer(() => console.log(42));
+};
+
+assert.throws(
+    ReferenceError, () => TestDisposableStackDeferOnDisposedStack(),
+    'Cannot add values to a disposed stack!');
+
+// defer() method when onDispose is not callable--------
+function TestDisposableStackDeferWithNonCallableOnDispose() {
+  let stack = new DisposableStack();
+  stack.defer(42);
+};
+assert.throws(
+    TypeError, () => TestDisposableStackDeferWithNonCallableOnDispose(),
+    'onDispose is not callable');
+
+// defer() method --------
+let deferValuesNormal = [];
+
+(function TestDisposableStackAdopt() {
+  let stack = new DisposableStack();
+  stack.defer(() => deferValuesNormal.push(42));
+  const disposable = {
+    value: 1,
+    [Symbol.dispose]() {
+      deferValuesNormal.push(43);
+    }
+  };
+  stack.use(disposable);
+  stack.defer(() => deferValuesNormal.push(44));
+  stack.dispose();
+})();
+assert.compareArray(deferValuesNormal, [44, 43, 42]);