From 68fe8bda4d39a0ceac86931ef56e48b18f5a798f Mon Sep 17 00:00:00 2001
From: anshikakalpana <anshikajain196872@gmail.com>
Date: Thu, 11 Jun 2026 01:59:24 +0530
Subject: [PATCH] assert: fix diff option ignored in Assert throws/rejects

Signed-off-by: anshikakalpana <anshikajain196872@gmail.com>
---
 lib/assert.js                      |  8 ++++----
 test/parallel/test-assert-class.js | 26 ++++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/lib/assert.js b/lib/assert.js
index 7c0edfc8f7f94f..07c38af75e10e6 100644
--- a/lib/assert.js
+++ b/lib/assert.js
@@ -725,7 +725,7 @@ function expectsNoError(stackStartFn, actual, error, message) {
  * @returns {void}
  */
 Assert.prototype.throws = function throws(promiseFn, ...args) {
-  expectsError(throws, getActual(promiseFn), ...args);
+  expectsError.call(this, throws, getActual(promiseFn), ...args);
 };
 
 /**
@@ -735,7 +735,7 @@ Assert.prototype.throws = function throws(promiseFn, ...args) {
  * @returns {Promise<void>}
  */
 Assert.prototype.rejects = async function rejects(promiseFn, ...args) {
-  expectsError(rejects, await waitForActual(promiseFn), ...args);
+  expectsError.call(this, rejects, await waitForActual(promiseFn), ...args);
 };
 
 /**
@@ -745,7 +745,7 @@ Assert.prototype.rejects = async function rejects(promiseFn, ...args) {
  * @returns {void}
  */
 Assert.prototype.doesNotThrow = function doesNotThrow(fn, ...args) {
-  expectsNoError(doesNotThrow, getActual(fn), ...args);
+  expectsNoError.call(this, doesNotThrow, getActual(fn), ...args);
 };
 
 /**
@@ -755,7 +755,7 @@ Assert.prototype.doesNotThrow = function doesNotThrow(fn, ...args) {
  * @returns {Promise<void>}
  */
 Assert.prototype.doesNotReject = async function doesNotReject(fn, ...args) {
-  expectsNoError(doesNotReject, await waitForActual(fn), ...args);
+  expectsNoError.call(this, doesNotReject, await waitForActual(fn), ...args);
 };
 
 /**
diff --git a/test/parallel/test-assert-class.js b/test/parallel/test-assert-class.js
index cccc7a2f36fff9..e167827bb8a034 100644
--- a/test/parallel/test-assert-class.js
+++ b/test/parallel/test-assert-class.js
@@ -638,4 +638,30 @@ test('Assert class non strict with simple diff', () => {
       { code: 'ERR_ASSERTION' }
     );
   });
+
+  test('Assert class diff option is passed through throws/rejects', async () => {
+    const assertInstance = new Assert({ diff: 'full' });
+
+    // throws
+    {
+      let err;
+      try {
+        assertInstance.throws(() => {}, /Missing expected exception/);
+      } catch (e) {
+        err = e;
+      }
+      assert.strictEqual(err?.diff, 'full');
+    }
+
+    // rejects
+    {
+      let err;
+      try {
+        await assertInstance.rejects(async () => {}, /Missing expected rejection/);
+      } catch (e) {
+        err = e;
+      }
+      assert.strictEqual(err?.diff, 'full');
+    }
+  });
 }