diff --git a/mailpoet/tests/_support/AcceptanceTester.php b/mailpoet/tests/_support/AcceptanceTester.php
index 2e357017e8..829d109a6a 100644
--- a/mailpoet/tests/_support/AcceptanceTester.php
+++ b/mailpoet/tests/_support/AcceptanceTester.php
@@ -276,7 +276,7 @@ class AcceptanceTester extends \Codeception\Actor {
   public function assertAttributeNotContains($selector, $attribute, $notContains) {
     $i = $this;
     $attributeValue = $i->grabAttributeFrom($selector, $attribute);
-    expect($attributeValue)->stringNotContainsString($notContains);
+    verify($attributeValue)->stringNotContainsString($notContains);
   }
 
   public function searchFor($query, $element = '#search_input') {
diff --git a/mailpoet/tests/integration/API/JSON/v1/NewslettersTest.php b/mailpoet/tests/integration/API/JSON/v1/NewslettersTest.php
index 891d3d4457..f99d4e2484 100644
--- a/mailpoet/tests/integration/API/JSON/v1/NewslettersTest.php
+++ b/mailpoet/tests/integration/API/JSON/v1/NewslettersTest.php
@@ -646,7 +646,7 @@ class NewslettersTest extends \MailPoetTest {
     ]);
 
     $response = $this->endpoint->showPreview($data);
-    expect($response->meta['preview_url'])->stringNotContainsString('http');
+    verify($response->meta['preview_url'])->stringNotContainsString('http');
     expect($response->meta['preview_url'])->regExp('!^\/\/!');
   }
 
diff --git a/mailpoet/tests/integration/Config/ShortcodesTest.php b/mailpoet/tests/integration/Config/ShortcodesTest.php
index 51f9582a03..fe337bb72b 100644
--- a/mailpoet/tests/integration/Config/ShortcodesTest.php
+++ b/mailpoet/tests/integration/Config/ShortcodesTest.php
@@ -91,7 +91,7 @@ class ShortcodesTest extends \MailPoetTest {
       ->create();
 
     $result = do_shortcode('[mailpoet_archive start_date="2023-09-04"]');
-    expect($result)->stringNotContainsString('Newsletter 1');
+    verify($result)->stringNotContainsString('Newsletter 1');
     verify($result)->stringContainsString('Newsletter 2');
   }
 
@@ -109,7 +109,7 @@ class ShortcodesTest extends \MailPoetTest {
 
     $result = do_shortcode('[mailpoet_archive end_date="2023-09-04"]');
     verify($result)->stringContainsString('Newsletter 1');
-    expect($result)->stringNotContainsString('Newsletter 2');
+    verify($result)->stringNotContainsString('Newsletter 2');
   }
 
   public function testArchiveAcceptsStartAndEndDate(): void {
@@ -130,9 +130,9 @@ class ShortcodesTest extends \MailPoetTest {
       ->create();
 
     $result = do_shortcode('[mailpoet_archive start_date="2023-08-02" end_date="2023-08-14"]');
-    expect($result)->stringNotContainsString('Newsletter 1');
+    verify($result)->stringNotContainsString('Newsletter 1');
     verify($result)->stringContainsString('Newsletter 2');
-    expect($result)->stringNotContainsString('Newsletter 3');
+    verify($result)->stringNotContainsString('Newsletter 3');
   }
 
   public function testArchiveAcceptsSubjectSearch(): void {
@@ -155,7 +155,7 @@ class ShortcodesTest extends \MailPoetTest {
     $result = do_shortcode('[mailpoet_archive subject_contains="great"]');
     verify($result)->stringContainsString('Great subject');
     verify($result)->stringContainsString('Subject that is great');
-    expect($result)->stringNotContainsString('Good subject');
+    verify($result)->stringNotContainsString('Good subject');
   }
 
   public function testArchiveAcceptsLastNDays(): void {
@@ -171,7 +171,7 @@ class ShortcodesTest extends \MailPoetTest {
       ->create();
     $result = do_shortcode('[mailpoet_archive in_the_last_days="4"]');
     verify($result)->stringContainsString('Newsletter 1');
-    expect($result)->stringNotContainsString('Newsletter 2');
+    verify($result)->stringNotContainsString('Newsletter 2');
   }
 
   public function testArchiveAcceptsSegments(): void {
@@ -191,7 +191,7 @@ class ShortcodesTest extends \MailPoetTest {
       ->create();
 
     $result = do_shortcode(sprintf("[mailpoet_archive segments=\"%s\"]", $segment2->getId()));
-    expect($result)->stringNotContainsString('Newsletter 1');
+    verify($result)->stringNotContainsString('Newsletter 1');
     verify($result)->stringContainsString('Newsletter 2');
   }
 
@@ -220,12 +220,12 @@ class ShortcodesTest extends \MailPoetTest {
     $result = do_shortcode('[mailpoet_archive limit="2"]');
     verify($result)->stringContainsString('Newsletter 1');
     verify($result)->stringContainsString('Newsletter 2');
-    expect($result)->stringNotContainsString('Newsletter 3');
+    verify($result)->stringNotContainsString('Newsletter 3');
 
     $result = do_shortcode('[mailpoet_archive limit="1"]');
     verify($result)->stringContainsString('Newsletter 1');
-    expect($result)->stringNotContainsString('Newsletter 2');
-    expect($result)->stringNotContainsString('Newsletter 3');
+    verify($result)->stringNotContainsString('Newsletter 2');
+    verify($result)->stringNotContainsString('Newsletter 3');
   }
 
   public function testItRendersShortcodeDefaultsInSubject() {
diff --git a/mailpoet/tests/integration/Cron/Workers/SendingQueue/Tasks/NewsletterTest.php b/mailpoet/tests/integration/Cron/Workers/SendingQueue/Tasks/NewsletterTest.php
index b5bff852c3..8f0f2b2d25 100644
--- a/mailpoet/tests/integration/Cron/Workers/SendingQueue/Tasks/NewsletterTest.php
+++ b/mailpoet/tests/integration/Cron/Workers/SendingQueue/Tasks/NewsletterTest.php
@@ -205,9 +205,9 @@ class NewsletterTest extends \MailPoetTest {
     verify($link)->null();
     $updatedQueue = SendingTask::getByNewsletterId($this->newsletter->getId());
     $renderedNewsletter = $updatedQueue->getNewsletterRenderedBody();
-    expect($renderedNewsletter['html'])
+    verify($renderedNewsletter['html'])
       ->stringNotContainsString('[mailpoet_click_data]');
-    expect($renderedNewsletter['html'])
+    verify($renderedNewsletter['html'])
       ->stringNotContainsString('[mailpoet_open_data]');
 
     $hookName = 'mailpoet_sending_newsletter_render_after_pre_process';
@@ -370,9 +370,9 @@ class NewsletterTest extends \MailPoetTest {
       $this->subscriber,
       $this->sendingTask
     );
-    expect($result['body']['html'])
+    verify($result['body']['html'])
       ->stringNotContainsString(Router::NAME . '&endpoint=track&action=click&data=');
-    expect($result['body']['text'])
+    verify($result['body']['text'])
       ->stringNotContainsString(Router::NAME . '&endpoint=track&action=click&data=');
   }
 
@@ -516,9 +516,9 @@ class NewsletterTest extends \MailPoetTest {
     $wooCommerceHelper = $this->diContainer->get(Helper::class);
     $coupon = (string)$wooCommerceHelper->getLatestCoupon();
 
-    expect($result['body']['html'])->stringNotContainsString(Coupon::CODE_PLACEHOLDER);
+    verify($result['body']['html'])->stringNotContainsString(Coupon::CODE_PLACEHOLDER);
     verify($result['body']['html'])->stringContainsString($coupon);
-    expect($result['body']['text'])->stringNotContainsString(Coupon::CODE_PLACEHOLDER);
+    verify($result['body']['text'])->stringNotContainsString(Coupon::CODE_PLACEHOLDER);
     verify($result['body']['text'])->stringContainsString($coupon);
   }
 
diff --git a/mailpoet/tests/integration/Newsletter/Blocks/AbandonedCartContentTest.php b/mailpoet/tests/integration/Newsletter/Blocks/AbandonedCartContentTest.php
index 232c0c5a99..0d573cb577 100644
--- a/mailpoet/tests/integration/Newsletter/Blocks/AbandonedCartContentTest.php
+++ b/mailpoet/tests/integration/Newsletter/Blocks/AbandonedCartContentTest.php
@@ -112,8 +112,8 @@ class AbandonedCartContentTest extends \MailPoetTest {
     $encodedResult = json_encode($result);
     verify($encodedResult)->stringContainsString('Product 4');
     verify($encodedResult)->stringContainsString('Product 3');
-    expect($encodedResult)->stringNotContainsString('Product 2');
-    expect($encodedResult)->stringNotContainsString('Product 1');
+    verify($encodedResult)->stringNotContainsString('Product 2');
+    verify($encodedResult)->stringNotContainsString('Product 1');
   }
 
   public function testItDoesNotRenderIfNoSendingTaskIsSupplied() {
@@ -145,7 +145,7 @@ class AbandonedCartContentTest extends \MailPoetTest {
     $sendingTask = $this->createSendingTask($newsletter);
     $result = $this->block->render($newsletter, $this->accBlock, false, $sendingTask);
     $encodedResult = json_encode($result);
-    expect($encodedResult)->stringNotContainsString('Product 4');
+    verify($encodedResult)->stringNotContainsString('Product 4');
     verify($encodedResult)->stringContainsString('Product 3');
     verify($encodedResult)->stringContainsString('Product 2');
     verify($encodedResult)->stringContainsString('Product 1');
diff --git a/mailpoet/tests/integration/Newsletter/Blocks/AutomatedLatestContentBlockTest.php b/mailpoet/tests/integration/Newsletter/Blocks/AutomatedLatestContentBlockTest.php
index b1f30b9a0d..a4fb2f1014 100644
--- a/mailpoet/tests/integration/Newsletter/Blocks/AutomatedLatestContentBlockTest.php
+++ b/mailpoet/tests/integration/Newsletter/Blocks/AutomatedLatestContentBlockTest.php
@@ -113,8 +113,8 @@ class AutomatedLatestContentBlockTest extends \MailPoetTest {
     $encodedResult = json_encode($result);
     verify($encodedResult)->stringContainsString('POST 4');
     verify($encodedResult)->stringContainsString('POST 3');
-    expect($encodedResult)->stringNotContainsString('POST 2');
-    expect($encodedResult)->stringNotContainsString('POST 1');
+    verify($encodedResult)->stringNotContainsString('POST 2');
+    verify($encodedResult)->stringNotContainsString('POST 1');
   }
 
   public function testItRendersPostOnlyOncePerEmail() {
@@ -124,12 +124,12 @@ class AutomatedLatestContentBlockTest extends \MailPoetTest {
     $encodedResult = json_encode($result);
     verify($encodedResult)->stringContainsString('POST 4');
     verify($encodedResult)->stringContainsString('POST 3');
-    expect($encodedResult)->stringNotContainsString('POST 2');
-    expect($encodedResult)->stringNotContainsString('POST 1');
+    verify($encodedResult)->stringNotContainsString('POST 2');
+    verify($encodedResult)->stringNotContainsString('POST 1');
     $result = $this->block->render($notificationHistory, $this->alcBlock);
     $encodedResult = json_encode($result);
-    expect($encodedResult)->stringNotContainsString('POST 4');
-    expect($encodedResult)->stringNotContainsString('POST 3');
+    verify($encodedResult)->stringNotContainsString('POST 4');
+    verify($encodedResult)->stringNotContainsString('POST 3');
     verify($encodedResult)->stringContainsString('POST 2');
     verify($encodedResult)->stringContainsString('POST 1');
   }
@@ -141,16 +141,16 @@ class AutomatedLatestContentBlockTest extends \MailPoetTest {
     $encodedResult = json_encode($result);
     verify($encodedResult)->stringContainsString('POST 4');
     verify($encodedResult)->stringContainsString('POST 3');
-    expect($encodedResult)->stringNotContainsString('POST 2');
-    expect($encodedResult)->stringNotContainsString('POST 1');
+    verify($encodedResult)->stringNotContainsString('POST 2');
+    verify($encodedResult)->stringNotContainsString('POST 1');
     $notification2 = $this->createNewsletter('Newsletter2', NewsletterEntity::TYPE_NOTIFICATION);
     $notificationHistory2 = $this->createNewsletter('Newsletter2', NewsletterEntity::TYPE_NOTIFICATION_HISTORY, $notification2);
     $result = $this->block->render($notificationHistory2, $this->alcBlock);
     $encodedResult = json_encode($result);
     verify($encodedResult)->stringContainsString('POST 4');
     verify($encodedResult)->stringContainsString('POST 3');
-    expect($encodedResult)->stringNotContainsString('POST 2');
-    expect($encodedResult)->stringNotContainsString('POST 1');
+    verify($encodedResult)->stringNotContainsString('POST 2');
+    verify($encodedResult)->stringNotContainsString('POST 1');
   }
 
   public function testItRendersOnlyPostsNewerThanLastSent() {
@@ -164,9 +164,9 @@ class AutomatedLatestContentBlockTest extends \MailPoetTest {
     $result = $this->block->render($notificationHistory, $this->alcBlock);
     $encodedResult = json_encode($result);
     verify($encodedResult)->stringContainsString('POST 4');
-    expect($encodedResult)->stringNotContainsString('POST 3');
-    expect($encodedResult)->stringNotContainsString('POST 2');
-    expect($encodedResult)->stringNotContainsString('POST 1');
+    verify($encodedResult)->stringNotContainsString('POST 3');
+    verify($encodedResult)->stringNotContainsString('POST 2');
+    verify($encodedResult)->stringNotContainsString('POST 1');
   }
 
   private function createPost(string $title, string $publishDate, string $type = 'post') {
diff --git a/mailpoet/tests/integration/Newsletter/Links/LinksTest.php b/mailpoet/tests/integration/Newsletter/Links/LinksTest.php
index 8d9a9ca2f5..d2aaa83521 100644
--- a/mailpoet/tests/integration/Newsletter/Links/LinksTest.php
+++ b/mailpoet/tests/integration/Newsletter/Links/LinksTest.php
@@ -97,7 +97,7 @@ class LinksTest extends \MailPoetTest {
       ->stringContainsString(Links::DATA_TAG_CLICK . '-' . $hashedLinks[0]['hash']);
     verify($updatedContent)
       ->stringContainsString(Links::DATA_TAG_CLICK . '-' . $hashedLinks[1]['hash']);
-    expect($updatedContent)->stringNotContainsString('link');
+    verify($updatedContent)->stringNotContainsString('link');
   }
 
   public function testItHashesAndReplacesLinksWithSpecialCharacters() {
@@ -131,7 +131,7 @@ class LinksTest extends \MailPoetTest {
       ->stringContainsString('replace by this');
     verify($updatedContent)
       ->stringContainsString('[link:some_link_shortcode]');
-    expect($updatedContent)->stringNotContainsString('http://example.com');
+    verify($updatedContent)->stringNotContainsString('http://example.com');
   }
 
   public function testItCreatesAndTransformsUrlDataObject() {
@@ -168,8 +168,8 @@ class LinksTest extends \MailPoetTest {
     $result = $this->links->replaceSubscriberData($subscriber->getId(), $queue->getId(), $template);
 
     // there are no click/open data tags
-    expect($result)->stringNotContainsString(Links::DATA_TAG_CLICK);
-    expect($result)->stringNotContainsString(Links::DATA_TAG_OPEN);
+    verify($result)->stringNotContainsString(Links::DATA_TAG_CLICK);
+    verify($result)->stringNotContainsString(Links::DATA_TAG_OPEN);
 
     // data tags were converted to URLs
     expect($result)
diff --git a/mailpoet/tests/integration/Newsletter/RendererTest.php b/mailpoet/tests/integration/Newsletter/RendererTest.php
index 791a223b87..c4a452cc69 100644
--- a/mailpoet/tests/integration/Newsletter/RendererTest.php
+++ b/mailpoet/tests/integration/Newsletter/RendererTest.php
@@ -428,7 +428,7 @@ class RendererTest extends \MailPoetTest {
     verify(
       $DOM('tr > td > table > tr > td.mailpoet_blockquote', 0)->html()
     )->stringContainsString('<h2');
-    expect(
+    verify(
       $DOM('tr > td > table > tr > td.mailpoet_blockquote', 0)->html()
     )->stringNotContainsString('<p');
     // ul/ol/li should have mailpoet_paragraph class added & styles applied
@@ -605,7 +605,7 @@ class RendererTest extends \MailPoetTest {
     $this->assertIsArray($body);
     $this->newsletter->setBody($body);
     $template = $this->renderer->render($this->newsletter);
-    expect($template['html'])->stringNotContainsString('mailpoet_logo_newsletter.png');
+    verify($template['html'])->stringNotContainsString('mailpoet_logo_newsletter.png');
   }
 
   public function testItDoesNotAddMailpoetLogoWhenPreviewIsEnabled() {
@@ -615,7 +615,7 @@ class RendererTest extends \MailPoetTest {
     $this->assertIsArray($body);
     $this->newsletter->setBody($body);
     $template = $this->renderer->renderAsPreview($this->newsletter);
-    expect($template['html'])->stringNotContainsString('mailpoet_logo_newsletter.png');
+    verify($template['html'])->stringNotContainsString('mailpoet_logo_newsletter.png');
   }
 
   public function testItAddsMailpoetLogo() {
diff --git a/mailpoet/tests/integration/Newsletter/ViewInBrowser/ViewInBrowserRendererTest.php b/mailpoet/tests/integration/Newsletter/ViewInBrowser/ViewInBrowserRendererTest.php
index 4fb28e74da..4eae5cb500 100644
--- a/mailpoet/tests/integration/Newsletter/ViewInBrowser/ViewInBrowserRendererTest.php
+++ b/mailpoet/tests/integration/Newsletter/ViewInBrowser/ViewInBrowserRendererTest.php
@@ -214,7 +214,7 @@ class ViewInBrowserRendererTest extends \MailPoetTest {
       $queue
     );
     // hashed link should be replaced with a URL
-    expect($renderedBody)->stringNotContainsString('[mailpoet_click_data]');
+    verify($renderedBody)->stringNotContainsString('[mailpoet_click_data]');
     verify($renderedBody)->stringContainsString('<a href="http://google.com">');
   }
 
@@ -229,7 +229,7 @@ class ViewInBrowserRendererTest extends \MailPoetTest {
       $queue
     );
     // open tracking data tag should be removed
-    expect($renderedBody)->stringNotContainsString('[mailpoet_open_data]');
+    verify($renderedBody)->stringNotContainsString('[mailpoet_open_data]');
     verify($renderedBody)->stringContainsString('<img alt="" class="" src="">');
   }
 }
diff --git a/mailpoet/tests/integration/Util/Notices/HeadersAlreadySentNoticeTest.php b/mailpoet/tests/integration/Util/Notices/HeadersAlreadySentNoticeTest.php
index 52ba10a124..42131896a9 100644
--- a/mailpoet/tests/integration/Util/Notices/HeadersAlreadySentNoticeTest.php
+++ b/mailpoet/tests/integration/Util/Notices/HeadersAlreadySentNoticeTest.php
@@ -92,13 +92,13 @@ class HeadersAlreadySentNoticeTest extends \MailPoetTest {
     $headersAlreadySentNotice = Stub::make(HeadersAlreadySentNotice::class);
     $notice = $headersAlreadySentNotice->display(false, true);
     verify($notice->getMessage())->stringContainsString('Inaccurate tracking');
-    expect($notice->getMessage())->stringNotContainsString('CAPTCHA not rendering');
+    verify($notice->getMessage())->stringNotContainsString('CAPTCHA not rendering');
   }
 
   public function testItPrintsNoTrackingMessageIftrackingDisabled() {
     $headersAlreadySentNotice = Stub::make(HeadersAlreadySentNotice::class);
     $notice = $headersAlreadySentNotice->display(true, false);
-    expect($notice->getMessage())->stringNotContainsString('Inaccurate tracking');
+    verify($notice->getMessage())->stringNotContainsString('Inaccurate tracking');
     verify($notice->getMessage())->stringContainsString('CAPTCHA not rendering');
   }
 
diff --git a/mailpoet/tests/integration/WooCommerce/SubscriptionTest.php b/mailpoet/tests/integration/WooCommerce/SubscriptionTest.php
index d1716b2f6d..41aec53d07 100644
--- a/mailpoet/tests/integration/WooCommerce/SubscriptionTest.php
+++ b/mailpoet/tests/integration/WooCommerce/SubscriptionTest.php
@@ -78,7 +78,7 @@ class SubscriptionTest extends \MailPoetTest {
     $subscriber = $this->subscribersRepository->getCurrentWPUser();
     $this->assertInstanceOf(SubscriberEntity::class, $subscriber);
     $this->subscribeToSegment($subscriber, $this->wcSegment);
-    expect($this->getRenderedOptinField())->stringNotContainsString('checked');
+    verify($this->getRenderedOptinField())->stringNotContainsString('checked');
   }
 
   public function testItDisplaysAnUncheckedCheckboxIfCurrentUserIsNotSubscribed() {
@@ -88,12 +88,12 @@ class SubscriptionTest extends \MailPoetTest {
     $subscriber = $this->subscribersRepository->getCurrentWPUser();
     $this->assertInstanceOf(SubscriberEntity::class, $subscriber);
     $this->unsubscribeToSegment($subscriber, $this->wcSegment);
-    expect($this->getRenderedOptinField())->stringNotContainsString('checked');
+    verify($this->getRenderedOptinField())->stringNotContainsString('checked');
   }
 
   public function testItDisplaysAnUncheckedCheckboxIfCurrentUserIsNotLoggedIn() {
     wp_set_current_user(0);
-    expect($this->getRenderedOptinField())->stringNotContainsString('checked');
+    verify($this->getRenderedOptinField())->stringNotContainsString('checked');
   }
 
   public function testItDisplaysCheckboxOptinMessageFromSettings() {
diff --git a/mailpoet/tests/integration/WooCommerce/TransactionalEmails/RendererTest.php b/mailpoet/tests/integration/WooCommerce/TransactionalEmails/RendererTest.php
index 30e749e2cf..ce58ea0c59 100644
--- a/mailpoet/tests/integration/WooCommerce/TransactionalEmails/RendererTest.php
+++ b/mailpoet/tests/integration/WooCommerce/TransactionalEmails/RendererTest.php
@@ -51,16 +51,16 @@ class RendererTest extends \MailPoetTest {
     verify($html)->stringContainsString('Some text before heading');
     verify($html)->stringContainsString('Heading Text');
     verify($html)->stringContainsString('Some text between heading and content');
-    expect($html)->stringNotContainsString('Some text after content');
+    verify($html)->stringNotContainsString('Some text after content');
   }
 
   public function testGetHTMLAfterContent() {
     $renderer = $this->getRenderer();
     $renderer->render($this->newsletter, 'Heading Text');
     $html = $renderer->getHTMLAfterContent();
-    expect($html)->stringNotContainsString('Some text before heading');
-    expect($html)->stringNotContainsString('Heading Text');
-    expect($html)->stringNotContainsString('Some text between heading and content');
+    verify($html)->stringNotContainsString('Some text before heading');
+    verify($html)->stringNotContainsString('Heading Text');
+    verify($html)->stringNotContainsString('Some text between heading and content');
     verify($html)->stringContainsString('Some text after content');
   }
 
diff --git a/mailpoet/tests/unit/Form/Block/ColumnsTest.php b/mailpoet/tests/unit/Form/Block/ColumnsTest.php
index cc5f524e80..aa4a984cbf 100644
--- a/mailpoet/tests/unit/Form/Block/ColumnsTest.php
+++ b/mailpoet/tests/unit/Form/Block/ColumnsTest.php
@@ -74,7 +74,7 @@ class ColumnsTest extends \MailPoetUnitTest {
     $html = $this->columns->render($block, 'content');
     $column = $this->htmlParser->getElementByXpath($html, '//div[1]');
     $class = $this->htmlParser->getAttribute($column, 'class');
-    expect($class->textContent)->stringNotContainsString('mailpoet_stack_on_mobile');
+    verify($class->textContent)->stringNotContainsString('mailpoet_stack_on_mobile');
   }
 
   public function testItShouldRenderCustomBackground() {
diff --git a/mailpoet/tests/unit/Form/Block/SelectTest.php b/mailpoet/tests/unit/Form/Block/SelectTest.php
index d50becdd29..dafff98539 100644
--- a/mailpoet/tests/unit/Form/Block/SelectTest.php
+++ b/mailpoet/tests/unit/Form/Block/SelectTest.php
@@ -97,6 +97,6 @@ class SelectTest extends \MailPoetUnitTest {
   public function testItDoesNotRenderHiddenOptions() {
     $this->block['params']['values'][2]['is_hidden'] = true;
     $rendered = $this->selectBlock->render($this->block, []);
-    expect($rendered)->stringNotContainsString(SubscriberEntity::STATUS_BOUNCED);
+    verify($rendered)->stringNotContainsString(SubscriberEntity::STATUS_BOUNCED);
   }
 }
diff --git a/mailpoet/tests/unit/Form/BlockStylesRendererTest.php b/mailpoet/tests/unit/Form/BlockStylesRendererTest.php
index 9d22fa7858..364a817490 100644
--- a/mailpoet/tests/unit/Form/BlockStylesRendererTest.php
+++ b/mailpoet/tests/unit/Form/BlockStylesRendererTest.php
@@ -49,7 +49,7 @@ class BlockStylesRendererTest extends \MailPoetUnitTest {
     verify($result)->stringContainsString('background-color:#dddddd;');
     verify($result)->stringContainsString('padding:40px;');
     verify($result)->stringContainsString('font-size:13px;');
-    expect($result)->stringNotContainsString('font-weight:bold;');
+    verify($result)->stringNotContainsString('font-weight:bold;');
   }
 
   public function testItShouldRenderSingleButtonStyles() {
diff --git a/mailpoet/tests/unit/Form/Util/FieldNameObfuscatorTest.php b/mailpoet/tests/unit/Form/Util/FieldNameObfuscatorTest.php
index 10bcb0a43a..01b2b9331b 100644
--- a/mailpoet/tests/unit/Form/Util/FieldNameObfuscatorTest.php
+++ b/mailpoet/tests/unit/Form/Util/FieldNameObfuscatorTest.php
@@ -21,7 +21,7 @@ class FieldNameObfuscatorTest extends \MailPoetUnitTest {
   }
 
   public function testObfuscateWorks() {
-    expect($this->obfuscator->obfuscate('email'))->stringNotContainsString('email');
+    verify($this->obfuscator->obfuscate('email'))->stringNotContainsString('email');
   }
 
   public function testObfuscateDeobfuscateWorks() {
diff --git a/mailpoet/tests/unit/Form/Util/StylesTest.php b/mailpoet/tests/unit/Form/Util/StylesTest.php
index ca7bbe206a..bf4ac671d9 100644
--- a/mailpoet/tests/unit/Form/Util/StylesTest.php
+++ b/mailpoet/tests/unit/Form/Util/StylesTest.php
@@ -165,8 +165,8 @@ class StylesTest extends \MailPoetUnitTest {
     // BC Style
     $styles = $this->styles->renderFormSettingsStyles($this->createForm($form), '#prefix', FormEntity::DISPLAY_TYPE_BELOW_POST);
     list($styleWithoutMedia) = explode('@media ', $styles);
-    expect($styleWithoutMedia)->stringNotContainsString('width:');
-    expect($styleWithoutMedia)->stringNotContainsString('max-width:');
+    verify($styleWithoutMedia)->stringNotContainsString('width:');
+    verify($styleWithoutMedia)->stringNotContainsString('max-width:');
     // Pixel
     $width = [
       'unit' => 'pixel',
@@ -180,7 +180,7 @@ class StylesTest extends \MailPoetUnitTest {
     $styles = $this->styles->renderFormSettingsStyles($this->createForm($form), '#prefix', FormEntity::DISPLAY_TYPE_BELOW_POST);
     list($styleWithoutMedia) = explode('@media ', $styles);
     verify($styleWithoutMedia)->stringContainsString('width: 900px;');
-    expect($styleWithoutMedia)->stringNotContainsString('max-width:');
+    verify($styleWithoutMedia)->stringNotContainsString('max-width:');
   }
 
   public function testItRendersWidthCssForFixedBar() {
@@ -255,8 +255,8 @@ class StylesTest extends \MailPoetUnitTest {
     // BC Style
     $styles = $this->styles->renderFormSettingsStyles($this->createForm($form), '#prefix', FormEntity::DISPLAY_TYPE_OTHERS);
     list($styleWithoutMedia) = explode('@media ', $styles);
-    expect($styleWithoutMedia)->stringNotContainsString('width:');
-    expect($styleWithoutMedia)->stringNotContainsString('max-width:');
+    verify($styleWithoutMedia)->stringNotContainsString('width:');
+    verify($styleWithoutMedia)->stringNotContainsString('max-width:');
     // Percent
     $width = [
       'unit' => 'percent',
@@ -270,7 +270,7 @@ class StylesTest extends \MailPoetUnitTest {
     $styles = $this->styles->renderFormSettingsStyles($this->createForm($form), '#prefix', FormEntity::DISPLAY_TYPE_OTHERS);
     list($styleWithoutMedia) = explode('@media ', $styles);
     verify($styleWithoutMedia)->stringContainsString('width: 90%;');
-    expect($styleWithoutMedia)->stringNotContainsString('max-width:');
+    verify($styleWithoutMedia)->stringNotContainsString('max-width:');
   }
 
   public function testItRendersSlideInSpecificStyles() {
diff --git a/mailpoet/tests/unit/Newsletter/Renderer/Blocks/TextTest.php b/mailpoet/tests/unit/Newsletter/Renderer/Blocks/TextTest.php
index 253d760fc4..4d645aa2f0 100644
--- a/mailpoet/tests/unit/Newsletter/Renderer/Blocks/TextTest.php
+++ b/mailpoet/tests/unit/Newsletter/Renderer/Blocks/TextTest.php
@@ -183,7 +183,7 @@ class TextTest extends \MailPoetUnitTest {
   public function testItRemovesLastLineBreak() {
     $this->block['text'] = 'hello<br />';
     $output = (new Text)->render($this->block);
-    expect($output)->stringNotContainsString('<br />');
+    verify($output)->stringNotContainsString('<br />');
   }
 
   public function htmlEntitiesStrings() {
@@ -200,7 +200,7 @@ class TextTest extends \MailPoetUnitTest {
   public function testItDoesNotDecodeHtmlEntities($htmlString) {
     $this->block['text'] = $htmlString;
     $output = (new Text())->render($this->block);
-    expect($output)->stringNotContainsString('<script>');
+    verify($output)->stringNotContainsString('<script>');
     verify($output)->stringContainsString("&lt;script&gt;alert('test');&lt;/script&gt;");
   }