diff --git a/tests/integration/Espo/Stream/ReactionsTest.php b/tests/integration/Espo/Stream/ReactionsTest.php
new file mode 100644
index 0000000000..890a1de0ba
--- /dev/null
+++ b/tests/integration/Espo/Stream/ReactionsTest.php
@@ -0,0 +1,198 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2024 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace tests\integration\Espo\Stream;
+
+use Espo\Core\Acl\Table;
+use Espo\Core\Api\Request;
+use Espo\Core\Exceptions\Forbidden;
+use Espo\Entities\Note;
+use Espo\Modules\Crm\Entities\Account;
+use Espo\Tools\Stream\Api\DeleteMyReactions;
+use Espo\Tools\Stream\Api\PostMyReactions;
+use Espo\Tools\Stream\MassNotePreparator;
+use tests\integration\Core\BaseTestCase;
+
+class ReactionsTest extends BaseTestCase
+{
+    private const REACTION_LIKE = 'Like';
+
+    public function testReactions(): void
+    {
+        $userTest = $this->createUser('test', [
+            'data' => [
+                Account::ENTITY_TYPE => [
+                    'create' => Table::LEVEL_NO,
+                    'read' => Table::LEVEL_ALL,
+                    'stream' => Table::LEVEL_OWN,
+                ],
+            ]
+        ]);
+
+        $em = $this->getEntityManager();
+
+        $account1 = $em->getRDBRepositoryByClass(Account::class)->getNew();
+        $account1->setAssignedUser($userTest);
+        $em->saveEntity($account1);
+
+        $account2 = $em->getRDBRepositoryByClass(Account::class)->getNew();
+        $em->saveEntity($account2);
+
+        $note1 = $this->getEntityManager()->getRDBRepositoryByClass(Note::class)->getNew();
+        $note1
+            ->setType(Note::TYPE_POST)
+            ->setParent($account1)
+            ->setPost('Test');
+        $em->saveEntity($note1);
+
+        $note2 = $this->getEntityManager()->getRDBRepositoryByClass(Note::class)->getNew();
+        $note2
+            ->setType(Note::TYPE_POST)
+            ->setParent($account2)
+            ->setPost('Test');
+        $em->saveEntity($note2);
+
+        $this->auth('test');
+        $this->reCreateApplication();
+
+        // Has access.
+
+        $request = $this->createMock(Request::class);
+
+        $request->expects($this->any())
+            ->method('getRouteParam')
+            ->willReturnMap([
+                ['id', $note1->getId()],
+                ['type', self::REACTION_LIKE],
+            ]);
+
+        /** @noinspection PhpUnhandledExceptionInspection */
+        $this->getInjectableFactory()
+            ->create(PostMyReactions::class)
+            ->process($request);
+
+        $this->getInjectableFactory()->create(MassNotePreparator::class)->prepare([$note1]);
+
+        $this->assertEquals([self::REACTION_LIKE], $note1->get('myReactions'));
+        $this->assertEquals(1, $note1->get('reactionCounts')->{self::REACTION_LIKE});
+
+        // Un-react.
+
+        $request = $this->createMock(Request::class);
+
+        $request->expects($this->any())
+            ->method('getRouteParam')
+            ->willReturnMap([
+                ['id', $note1->getId()],
+                ['type', self::REACTION_LIKE],
+            ]);
+
+        /** @noinspection PhpUnhandledExceptionInspection */
+        $this->getInjectableFactory()
+            ->create(DeleteMyReactions::class)
+            ->process($request);
+
+        $this->getInjectableFactory()->create(MassNotePreparator::class)->prepare([$note1]);
+
+        $this->assertEquals([], $note1->get('myReactions'));
+        $this->assertEquals(0, $note1->get('reactionCounts')->{self::REACTION_LIKE} ?? 0);
+
+        // No access to note.
+
+        $isThrown = false;
+
+        try {
+            $request = $this->createMock(Request::class);
+
+            $request->expects($this->any())
+                ->method('getRouteParam')
+                ->willReturnMap([
+                    ['id', $note2->getId()],
+                    ['type', self::REACTION_LIKE],
+                ]);
+
+            /** @noinspection PhpUnhandledExceptionInspection */
+            $this->getInjectableFactory()
+                ->create(PostMyReactions::class)
+                ->process($request);
+        } catch (Forbidden) {
+            $isThrown = true;
+        }
+
+        $this->assertTrue($isThrown);
+
+        // No access to note to un-react.
+
+        $isThrown = false;
+
+        try {
+            $request = $this->createMock(Request::class);
+
+            $request->expects($this->any())
+                ->method('getRouteParam')
+                ->willReturnMap([
+                    ['id', $note2->getId()],
+                    ['type', self::REACTION_LIKE],
+                ]);
+
+            /** @noinspection PhpUnhandledExceptionInspection */
+            $this->getInjectableFactory()
+                ->create(DeleteMyReactions::class)
+                ->process($request);
+        } catch (Forbidden) {
+            $isThrown = true;
+        }
+
+        $this->assertTrue($isThrown);
+
+        // Not allowed reaction.
+
+        $isThrown = false;
+
+        try {
+            $request = $this->createMock(Request::class);
+
+            $request->expects($this->any())
+                ->method('getRouteParam')
+                ->willReturnMap([
+                    ['id', $note1->getId()],
+                    ['type', 'Smile'],
+                ]);
+
+            /** @noinspection PhpUnhandledExceptionInspection */
+            $this->getInjectableFactory()
+                ->create(PostMyReactions::class)
+                ->process($request);
+        } catch (Forbidden) {
+            $isThrown = true;
+        }
+
+        $this->assertTrue($isThrown);
+    }
+}