diff --git a/mailpoet/tests/integration/AutomaticEmails/WooCommerce/Events/AbandonedCartTest.php b/mailpoet/tests/integration/AutomaticEmails/WooCommerce/Events/AbandonedCartTest.php
index adb3fe8d9e..df40dd7241 100644
--- a/mailpoet/tests/integration/AutomaticEmails/WooCommerce/Events/AbandonedCartTest.php
+++ b/mailpoet/tests/integration/AutomaticEmails/WooCommerce/Events/AbandonedCartTest.php
@@ -387,7 +387,6 @@ class AbandonedCartTest extends \MailPoetTest {
 
   public function _after() {
     parent::_after();
-    WPFunctions::set(new WPFunctions());
     Carbon::setTestNow();
     // Restore original cart object
     $this->wooCommerce->cart = $this->cartBackup;
diff --git a/mailpoet/tests/integration/AutomaticEmails/WooCommerce/Events/FirstPurchaseTest.php b/mailpoet/tests/integration/AutomaticEmails/WooCommerce/Events/FirstPurchaseTest.php
index 5395d43f10..371d1ddd52 100644
--- a/mailpoet/tests/integration/AutomaticEmails/WooCommerce/Events/FirstPurchaseTest.php
+++ b/mailpoet/tests/integration/AutomaticEmails/WooCommerce/Events/FirstPurchaseTest.php
@@ -359,9 +359,4 @@ class FirstPurchaseTest extends \MailPoetTest {
     $this->entityManager->flush();
     return $sendingQueue;
   }
-
-  public function _after() {
-    parent::_after();
-    WPFunctions::set(new WPFunctions);
-  }
 }
diff --git a/mailpoet/tests/integration/AutomaticEmails/WooCommerce/Events/PurchasedInCategoryTest.php b/mailpoet/tests/integration/AutomaticEmails/WooCommerce/Events/PurchasedInCategoryTest.php
index f687683f66..e10eba7e87 100644
--- a/mailpoet/tests/integration/AutomaticEmails/WooCommerce/Events/PurchasedInCategoryTest.php
+++ b/mailpoet/tests/integration/AutomaticEmails/WooCommerce/Events/PurchasedInCategoryTest.php
@@ -36,7 +36,6 @@ class PurchasedInCategoryTest extends \MailPoetTest {
   private $segmentsRepository;
 
   public function _before() {
-    WPFunctions::set(new WPFunctions);
     WPFunctions::get()->removeAllFilters('woocommerce_payment_complete');
     $this->woocommerceHelper = $this->createMock(WCHelper::class);
     $this->event = new PurchasedInCategory($this->woocommerceHelper);
diff --git a/mailpoet/tests/integration/AutomaticEmails/WooCommerce/Events/PurchasedProductTest.php b/mailpoet/tests/integration/AutomaticEmails/WooCommerce/Events/PurchasedProductTest.php
index 2d84182e52..46cad225cf 100644
--- a/mailpoet/tests/integration/AutomaticEmails/WooCommerce/Events/PurchasedProductTest.php
+++ b/mailpoet/tests/integration/AutomaticEmails/WooCommerce/Events/PurchasedProductTest.php
@@ -280,9 +280,4 @@ class PurchasedProductTest extends \MailPoetTest {
 
     return $subscriber;
   }
-
-  public function _after() {
-    parent::_after();
-    WPFunctions::set(new WPFunctions);
-  }
 }
diff --git a/mailpoet/tests/integration/Config/AccessControlTest.php b/mailpoet/tests/integration/Config/AccessControlTest.php
index f5ec5a6d14..699bbc465c 100644
--- a/mailpoet/tests/integration/Config/AccessControlTest.php
+++ b/mailpoet/tests/integration/Config/AccessControlTest.php
@@ -112,9 +112,4 @@ class AccessControlTest extends \MailPoetTest {
 
     expect($accessControl->validatePermission($capability))->true();
   }
-
-  public function _after() {
-    parent::_after();
-    WPFunctions::set(new WPFunctions);
-  }
 }
diff --git a/mailpoet/tests/integration/Cron/Workers/SchedulerTest.php b/mailpoet/tests/integration/Cron/Workers/SchedulerTest.php
index b15be7e1e6..56dbe3e94b 100644
--- a/mailpoet/tests/integration/Cron/Workers/SchedulerTest.php
+++ b/mailpoet/tests/integration/Cron/Workers/SchedulerTest.php
@@ -427,7 +427,6 @@ class SchedulerTest extends \MailPoetTest {
     $scheduledTask = $this->scheduledTasksRepository->findOneBySendingQueue($sendingQueue);
     $this->assertInstanceOf(ScheduledTaskEntity::class, $scheduledTask);
     $this->tester->assertEqualDateTimes($scheduledTask->getScheduledAt(), $currentTime->addMinutes(ScheduledTask::BASIC_RESCHEDULE_TIMEOUT), 1);
-    WPFunctions::set(new WPFunctions());
   }
 
   public function testItDoesntRunQueueDeliveryWhenMailpoetSubscriberHasUnsubscribed() {
diff --git a/mailpoet/tests/integration/Newsletter/Preview/SendPreviewControllerTest.php b/mailpoet/tests/integration/Newsletter/Preview/SendPreviewControllerTest.php
index 6e4d37c9bb..1061d97f1d 100644
--- a/mailpoet/tests/integration/Newsletter/Preview/SendPreviewControllerTest.php
+++ b/mailpoet/tests/integration/Newsletter/Preview/SendPreviewControllerTest.php
@@ -56,11 +56,6 @@ class SendPreviewControllerTest extends \MailPoetTest {
     $this->newsletter = $newsletter;
   }
 
-  public function _after() {
-    parent::_after();
-    WPFunctions::set(new WPFunctions());
-  }
-
   public function testItCanSendAPreview() {
     $mailer = $this->makeEmpty(Mailer::class, [
       'send' => Expected::once(
diff --git a/mailpoet/tests/integration/Settings/UserFlagsControllerTest.php b/mailpoet/tests/integration/Settings/UserFlagsControllerTest.php
index cbf644378d..430900896f 100644
--- a/mailpoet/tests/integration/Settings/UserFlagsControllerTest.php
+++ b/mailpoet/tests/integration/Settings/UserFlagsControllerTest.php
@@ -85,11 +85,6 @@ class UserFlagsControllerTest extends \MailPoetTest {
     expect($flag)->null();
   }
 
-  public function _after() {
-    parent::_after();
-    WPFunctions::set(new WPFunctions);
-  }
-
   private function createUserFlag($userId, $name, $value) {
     $flag = new UserFlagEntity();
     $flag->setUserId($userId);
diff --git a/mailpoet/tests/integration/Subscribers/ImportExport/Import/ImportTest.php b/mailpoet/tests/integration/Subscribers/ImportExport/Import/ImportTest.php
index 7d51d95c7c..f838807d32 100644
--- a/mailpoet/tests/integration/Subscribers/ImportExport/Import/ImportTest.php
+++ b/mailpoet/tests/integration/Subscribers/ImportExport/Import/ImportTest.php
@@ -797,7 +797,6 @@ class ImportTest extends \MailPoetTest {
       $data['subscribers'][1][2],
     ]]);
     expect($newSubscribers)->count(2);
-    WPFunctions::set(new WPFunctions());
   }
 
   public function testItOnlyAppliesCustomFormatToSitesWithCustomFormat(): void {
@@ -823,7 +822,6 @@ class ImportTest extends \MailPoetTest {
     ]]);
     expect($newSubscribers)->count(1);
     expect($newSubscribers[0]->getEmail())->equals('correctdateformat2@yopmail.com');
-    WPFunctions::set(new WPFunctions());
   }
 
   private function createImportInstance(array $data): Import {
diff --git a/mailpoet/tests/integration/Subscribers/ImportExport/Import/MailChimpTest.php b/mailpoet/tests/integration/Subscribers/ImportExport/Import/MailChimpTest.php
index f69fc931a2..416b98eaa3 100644
--- a/mailpoet/tests/integration/Subscribers/ImportExport/Import/MailChimpTest.php
+++ b/mailpoet/tests/integration/Subscribers/ImportExport/Import/MailChimpTest.php
@@ -176,9 +176,4 @@ class MailChimpTest extends \MailPoetTest {
     ];
     expect($this->mailchimp->isSubscriberAllowed($subscribed))->true();
   }
-
-  public function _after(): void {
-    parent::_after();
-    WPFunctions::set(new WPFunctions);
-  }
 }
diff --git a/mailpoet/tests/integration/Twig/FunctionsTest.php b/mailpoet/tests/integration/Twig/FunctionsTest.php
index 2efdd305aa..79ba688850 100644
--- a/mailpoet/tests/integration/Twig/FunctionsTest.php
+++ b/mailpoet/tests/integration/Twig/FunctionsTest.php
@@ -21,9 +21,4 @@ class FunctionsTest extends \MailPoetTest {
     $resultNoRtl = $twig->render('template');
     expect($resultNoRtl)->isEmpty();
   }
-
-  public function _after() {
-    parent::_after();
-    WPFunctions::set(new WPFunctions);
-  }
 }
diff --git a/mailpoet/tests/integration/_bootstrap.php b/mailpoet/tests/integration/_bootstrap.php
index 60af97cb16..014377f10d 100644
--- a/mailpoet/tests/integration/_bootstrap.php
+++ b/mailpoet/tests/integration/_bootstrap.php
@@ -6,6 +6,7 @@ use MailPoet\Cron\CronTrigger;
 use MailPoet\DI\ContainerWrapper;
 use MailPoet\Features\FeaturesController;
 use MailPoet\Settings\SettingsController;
+use MailPoet\WP\Functions as WPFunctions;
 use MailPoetVendor\Doctrine\DBAL\Connection;
 use MailPoetVendor\Doctrine\ORM\EntityManager;
 use MailPoetVendor\Doctrine\Persistence\Mapping\ClassMetadata;
@@ -97,6 +98,8 @@ abstract class MailPoetTest extends \Codeception\TestCase\Test { // phpcs:ignore
     $this->diContainer = ContainerWrapper::getInstance(WP_DEBUG);
     $this->connection = $this->diContainer->get(Connection::class);
     $this->entityManager = $this->diContainer->get(EntityManager::class);
+    // Reset WPFunctions
+    WPFunctions::set(new WPFunctions());
     // switch cron to Linux method
     $this->diContainer->get(\MailPoet\Cron\DaemonActionSchedulerRunner::class)->deactivate();
     $this->diContainer->get(SettingsController::class)->set('cron_trigger.method', CronTrigger::METHOD_LINUX_CRON);