diff --git a/mailpoet/tests/integration/API/JSON/ResponseBuilders/DynamicSegmentsResponseBuilderTest.php b/mailpoet/tests/integration/API/JSON/ResponseBuilders/DynamicSegmentsResponseBuilderTest.php
index 73492ef838..d905643c76 100644
--- a/mailpoet/tests/integration/API/JSON/ResponseBuilders/DynamicSegmentsResponseBuilderTest.php
+++ b/mailpoet/tests/integration/API/JSON/ResponseBuilders/DynamicSegmentsResponseBuilderTest.php
@@ -90,7 +90,7 @@ class DynamicSegmentsResponseBuilderTest extends \MailPoetTest {
     verify($response[0]['name'])->equals($name);
     verify($response[0]['description'])->equals($description);
     verify($response[0]['type'])->equals(SegmentEntity::TYPE_DYNAMIC);
-    expect($response[0]['subscribers_url'])->startsWith('http');
+    verify($response[0]['subscribers_url'])->stringStartsWith('http');
     verify($response[0]['count_all'])->equals(1);
     verify($response[0]['count_subscribed'])->equals(1);
 
diff --git a/mailpoet/tests/integration/API/JSON/ResponseBuilders/SegmentsResponseBuilderTest.php b/mailpoet/tests/integration/API/JSON/ResponseBuilders/SegmentsResponseBuilderTest.php
index ef407f4be6..939d5e06bc 100644
--- a/mailpoet/tests/integration/API/JSON/ResponseBuilders/SegmentsResponseBuilderTest.php
+++ b/mailpoet/tests/integration/API/JSON/ResponseBuilders/SegmentsResponseBuilderTest.php
@@ -54,7 +54,7 @@ class SegmentsResponseBuilderTest extends \MailPoetTest {
     verify($response)->isArray();
     verify($response[0]['name'])->equals($name);
     verify($response[0]['type'])->equals(SegmentEntity::TYPE_DEFAULT);
-    expect($response[0]['subscribers_url'])->startsWith('http');
+    verify($response[0]['subscribers_url'])->stringStartsWith('http');
     verify($response[0]['subscribers_count']['subscribed'])->equals('1');
   }
 }
diff --git a/mailpoet/tests/integration/API/JSON/v1/FormsTest.php b/mailpoet/tests/integration/API/JSON/v1/FormsTest.php
index 413e244325..e2dbeefc0c 100644
--- a/mailpoet/tests/integration/API/JSON/v1/FormsTest.php
+++ b/mailpoet/tests/integration/API/JSON/v1/FormsTest.php
@@ -135,7 +135,7 @@ class FormsTest extends \MailPoetTest {
     wp_set_current_user(0);
     $response = $this->endpoint->saveEditor($form);
     verify($response->status)->equals(APIResponse::STATUS_FORBIDDEN);
-    expect($response->errors[0]['message'])->startsWith('Only administrator can');
+    verify($response->errors[0]['message'])->stringStartsWith('Only administrator can');
   }
 
   public function testItCanExtractListsFromListSelectionBlock() {
diff --git a/mailpoet/tests/integration/Cron/CronHelperTest.php b/mailpoet/tests/integration/Cron/CronHelperTest.php
index ca6b19a2b6..f2fcd39aee 100644
--- a/mailpoet/tests/integration/Cron/CronHelperTest.php
+++ b/mailpoet/tests/integration/Cron/CronHelperTest.php
@@ -264,7 +264,7 @@ class CronHelperTest extends \MailPoetTest {
       $this->cronHelper->enforceExecutionLimit($time - $this->cronHelper->getDaemonExecutionLimit());
       self::fail('Execution limit exception not thrown.');
     } catch (\Exception $e) {
-      expect($e->getMessage())->startsWith('The maximum execution time');
+      verify($e->getMessage())->stringStartsWith('The maximum execution time');
     }
   }
 
diff --git a/mailpoet/tests/integration/Cron/CronWorkerRunnerTest.php b/mailpoet/tests/integration/Cron/CronWorkerRunnerTest.php
index c7b6ee6548..a1a0b86c29 100644
--- a/mailpoet/tests/integration/Cron/CronWorkerRunnerTest.php
+++ b/mailpoet/tests/integration/Cron/CronWorkerRunnerTest.php
@@ -221,7 +221,7 @@ class CronWorkerRunnerTest extends \MailPoetTest {
       $cronWorkerRunner->run($worker);
       self::fail('Maximum execution time limit exception was not thrown.');
     } catch (\Exception $e) {
-      expect($e->getMessage())->startsWith('The maximum execution time');
+      verify($e->getMessage())->stringStartsWith('The maximum execution time');
     }
   }
 
diff --git a/mailpoet/tests/integration/Cron/Workers/SchedulerTest.php b/mailpoet/tests/integration/Cron/Workers/SchedulerTest.php
index a222c864a8..f68af4f4a9 100644
--- a/mailpoet/tests/integration/Cron/Workers/SchedulerTest.php
+++ b/mailpoet/tests/integration/Cron/Workers/SchedulerTest.php
@@ -119,7 +119,7 @@ class SchedulerTest extends \MailPoetTest {
       $scheduler->process(microtime(true) - $this->cronHelper->getDaemonExecutionLimit());
       self::fail('Maximum execution time limit exception was not thrown.');
     } catch (\Exception $e) {
-      expect($e->getMessage())->startsWith('The maximum execution time');
+      verify($e->getMessage())->stringStartsWith('The maximum execution time');
     }
   }
 
diff --git a/mailpoet/tests/integration/Cron/Workers/SubscribersLastEngagementTest.php b/mailpoet/tests/integration/Cron/Workers/SubscribersLastEngagementTest.php
index a98e42a7ae..a505608e7a 100644
--- a/mailpoet/tests/integration/Cron/Workers/SubscribersLastEngagementTest.php
+++ b/mailpoet/tests/integration/Cron/Workers/SubscribersLastEngagementTest.php
@@ -92,7 +92,7 @@ class SubscribersLastEngagementTest extends \MailPoetTest {
       $exception = $e;
     }
     $this->assertInstanceOf(\Exception::class, $exception);
-    expect($exception->getMessage())->startsWith('The maximum execution time');
+    verify($exception->getMessage())->stringStartsWith('The maximum execution time');
     $result = $this->worker->processTaskStrategy($task, microtime(true));
     verify($result)->true();
   }
diff --git a/mailpoet/tests/integration/NewsletterTemplates/ThumbnailSaverTest.php b/mailpoet/tests/integration/NewsletterTemplates/ThumbnailSaverTest.php
index b09c5768f8..8ac3c2c643 100644
--- a/mailpoet/tests/integration/NewsletterTemplates/ThumbnailSaverTest.php
+++ b/mailpoet/tests/integration/NewsletterTemplates/ThumbnailSaverTest.php
@@ -19,7 +19,7 @@ class ThumbnailSaverTest extends \MailPoetTest {
     $thumbnailUrl = $template->getThumbnail();
     verify($thumbnailUrl)->notEmpty();
     expect($thumbnailUrl)->string();
-    expect($thumbnailUrl)->startsWith(Env::$tempUrl);
+    verify($thumbnailUrl)->stringStartsWith(Env::$tempUrl);
     verify($thumbnailUrl)->stringContainsString(ThumbnailSaver::THUMBNAIL_DIRECTORY);
     [,$fileName] = explode(ThumbnailSaver::THUMBNAIL_DIRECTORY, (string)$thumbnailUrl);
     $file = Env::$tempPath . '/' . ThumbnailSaver::THUMBNAIL_DIRECTORY . $fileName;
@@ -36,7 +36,7 @@ class ThumbnailSaverTest extends \MailPoetTest {
     // Base url was updated back to initial value
     $thumbnailUrl = $template->getThumbnail();
     expect($thumbnailUrl)->string();
-    expect($thumbnailUrl)->startsWith(Env::$tempUrl);
+    verify($thumbnailUrl)->stringStartsWith(Env::$tempUrl);
     [,$fileName] = explode(ThumbnailSaver::THUMBNAIL_DIRECTORY, (string)$thumbnailUrl);
     // File is still the same
     expect($thumbnailUrl)->endsWith($fileName);
diff --git a/mailpoet/tests/unit/Form/Block/HeadingTest.php b/mailpoet/tests/unit/Form/Block/HeadingTest.php
index 8f0db3a15c..5413aa7850 100644
--- a/mailpoet/tests/unit/Form/Block/HeadingTest.php
+++ b/mailpoet/tests/unit/Form/Block/HeadingTest.php
@@ -18,7 +18,7 @@ class HeadingTest extends \MailPoetUnitTest {
 
   public function testItShouldRenderHeading() {
     $html = $this->heading->render([]);
-    expect($html)->startsWith('<h2');
+    verify($html)->stringStartsWith('<h2');
   }
 
   public function testItShouldRenderContent() {
diff --git a/mailpoet/tests/unit/Form/Block/ParagraphTest.php b/mailpoet/tests/unit/Form/Block/ParagraphTest.php
index a3bd7b9961..9f6ba54064 100644
--- a/mailpoet/tests/unit/Form/Block/ParagraphTest.php
+++ b/mailpoet/tests/unit/Form/Block/ParagraphTest.php
@@ -18,7 +18,7 @@ class ParagraphTest extends \MailPoetUnitTest {
 
   public function testItShouldRenderParagraph() {
     $html = $this->paragraph->render([]);
-    expect($html)->startsWith('<p');
+    verify($html)->stringStartsWith('<p');
   }
 
   public function testItShouldRenderContent() {