diff --git a/Tests/Command/CreateDatabaseDoctrineTest.php b/Tests/Command/CreateDatabaseDoctrineTest.php
index a90b36555..805661193 100644
--- a/Tests/Command/CreateDatabaseDoctrineTest.php
+++ b/Tests/Command/CreateDatabaseDoctrineTest.php
@@ -39,7 +39,10 @@ public function testExecute() : void
             array_merge(['command' => $command->getName()])
         );
 
-        $this->assertContains('Created database ' . sys_get_temp_dir() . '/' . $dbName . ' for connection named ' . $connectionName, $commandTester->getDisplay());
+        $this->assertStringContainsString(
+            'Created database ' . sys_get_temp_dir() . '/' . $dbName . ' for connection named ' . $connectionName,
+            $commandTester->getDisplay()
+        );
     }
 
     /**
@@ -81,12 +84,18 @@ public function testExecuteWithShardAlias(string $shardOption) : void
         $commandTester = new CommandTester($command);
         $commandTester->execute(['command' => $command->getName(), $shardOption => 1]);
 
-        $this->assertContains('Created database ' . sys_get_temp_dir() . '/shard_1 for connection named ' . $connectionName, $commandTester->getDisplay());
+        $this->assertStringContainsString(
+            'Created database ' . sys_get_temp_dir() . '/shard_1 for connection named ' . $connectionName,
+            $commandTester->getDisplay()
+        );
 
         $commandTester = new CommandTester($command);
         $commandTester->execute(['command' => $command->getName(), $shardOption => 2]);
 
-        $this->assertContains('Created database ' . sys_get_temp_dir() . '/shard_2 for connection named ' . $connectionName, $commandTester->getDisplay());
+        $this->assertStringContainsString(
+            'Created database ' . sys_get_temp_dir() . '/shard_2 for connection named ' . $connectionName,
+            $commandTester->getDisplay()
+        );
     }
 
     public function provideShardOption() : Generator
diff --git a/Tests/Command/DropDatabaseDoctrineTest.php b/Tests/Command/DropDatabaseDoctrineTest.php
index 3064cc0ad..eef28598a 100644
--- a/Tests/Command/DropDatabaseDoctrineTest.php
+++ b/Tests/Command/DropDatabaseDoctrineTest.php
@@ -37,7 +37,7 @@ public function testExecute(array $options) : void
             array_merge(['command' => $command->getName()], $options)
         );
 
-        $this->assertContains(
+        $this->assertStringContainsString(
             sprintf(
                 'Dropped database %s for connection named %s',
                 sys_get_temp_dir() . '/' . $dbName,
@@ -77,7 +77,7 @@ public function testExecuteWithoutOptionForceWillFailWithAttentionMessage() : vo
             array_merge(['command' => $command->getName()])
         );
 
-        $this->assertContains(
+        $this->assertStringContainsString(
             sprintf(
                 'Would drop the database %s for connection named %s.',
                 sys_get_temp_dir() . '/' . $dbName,
@@ -85,7 +85,10 @@ public function testExecuteWithoutOptionForceWillFailWithAttentionMessage() : vo
             ),
             $commandTester->getDisplay()
         );
-        $this->assertContains('Please run the operation with --force to execute', $commandTester->getDisplay());
+        $this->assertStringContainsString(
+            'Please run the operation with --force to execute',
+            $commandTester->getDisplay()
+        );
     }
 
     public function provideForceOption() : Generator
diff --git a/Tests/Command/ImportMappingDoctrineCommandTest.php b/Tests/Command/ImportMappingDoctrineCommandTest.php
index 5433bd9fe..91d293431 100644
--- a/Tests/Command/ImportMappingDoctrineCommandTest.php
+++ b/Tests/Command/ImportMappingDoctrineCommandTest.php
@@ -70,7 +70,11 @@ public function testExecuteXmlWithBundle() : void
 
         $expectedMetadataPath = sys_get_temp_dir() . '/import_mapping_bundle/Resources/config/doctrine/Product.orm.xml';
         $this->assertFileExists($expectedMetadataPath);
-        $this->assertContains('"Doctrine\Bundle\DoctrineBundle\Tests\Command\Entity\Product"', file_get_contents($expectedMetadataPath), 'Metadata contains correct namespace');
+        $this->assertStringContainsString(
+            '"Doctrine\Bundle\DoctrineBundle\Tests\Command\Entity\Product"',
+            file_get_contents($expectedMetadataPath),
+            'Metadata contains correct namespace'
+        );
     }
 
     public function testExecuteAnnotationsWithBundle() : void
@@ -82,7 +86,11 @@ public function testExecuteAnnotationsWithBundle() : void
 
         $expectedMetadataPath = sys_get_temp_dir() . '/import_mapping_bundle/Entity/Product.php';
         $this->assertFileExists($expectedMetadataPath);
-        $this->assertContains('namespace Doctrine\Bundle\DoctrineBundle\Tests\Command\Entity;', file_get_contents($expectedMetadataPath), 'File contains correct namespace');
+        $this->assertStringContainsString(
+            'namespace Doctrine\Bundle\DoctrineBundle\Tests\Command\Entity;',
+            file_get_contents($expectedMetadataPath),
+            'File contains correct namespace'
+        );
     }
 
     /**
@@ -103,7 +111,11 @@ public function testExecuteXmlWithNamespace() : void
 
         $expectedMetadataPath = $this->kernel->getProjectDir() . '/config/doctrine/Product.orm.xml';
         $this->assertFileExists($expectedMetadataPath);
-        $this->assertContains('"Some\Namespace\Entity\Product"', file_get_contents($expectedMetadataPath), 'Metadata contains correct namespace');
+        $this->assertStringContainsString(
+            '"Some\Namespace\Entity\Product"',
+            file_get_contents($expectedMetadataPath),
+            'Metadata contains correct namespace'
+        );
     }
 
     public function testExecuteAnnotationsWithNamespace() : void
@@ -116,7 +128,11 @@ public function testExecuteAnnotationsWithNamespace() : void
 
         $expectedMetadataPath = $this->kernel->getProjectDir() . '/src/Entity/Product.php';
         $this->assertFileExists($expectedMetadataPath);
-        $this->assertContains('namespace Some\Namespace\Entity;', file_get_contents($expectedMetadataPath), 'Metadata contains correct namespace');
+        $this->assertStringContainsString(
+            'namespace Some\Namespace\Entity;',
+            file_get_contents($expectedMetadataPath),
+            'Metadata contains correct namespace'
+        );
     }
 }
 
diff --git a/Tests/DependencyInjection/AbstractDoctrineExtensionTest.php b/Tests/DependencyInjection/AbstractDoctrineExtensionTest.php
index 6762310a1..aaf4d4e67 100644
--- a/Tests/DependencyInjection/AbstractDoctrineExtensionTest.php
+++ b/Tests/DependencyInjection/AbstractDoctrineExtensionTest.php
@@ -647,7 +647,10 @@ public function testSecondLevelCache() : void
         $this->assertEquals(600, $myEntityRegionArgs[2]);
 
         $this->assertEquals('doctrine.orm.default_second_level_cache.region.my_query_region', $myQueryRegionArgs[0]);
-        $this->assertContains('/doctrine/orm/slc/filelock', $myQueryRegionArgs[1]);
+        $this->assertStringContainsString(
+            '/doctrine/orm/slc/filelock',
+            $myQueryRegionArgs[1]
+        );
         $this->assertEquals(60, $myQueryRegionArgs[2]);
 
         $this->assertEquals('doctrine.orm.default_second_level_cache.regions_configuration', $slcFactoryArgs[0]);
diff --git a/Tests/ProfilerTest.php b/Tests/ProfilerTest.php
index 8276d554f..05f85f620 100644
--- a/Tests/ProfilerTest.php
+++ b/Tests/ProfilerTest.php
@@ -93,7 +93,7 @@ public function testRender() : void
             html_entity_decode($expectedEscapedSql)
         );
 
-        $this->assertContains($expectedEscapedSql, $output);
+        $this->assertStringContainsString($expectedEscapedSql, $output);
 
         $this->assertSame(1, preg_match('/' . str_replace(
             ' ',