diff --git a/core/modules/system/tests/src/Kernel/Scripts/DbDumpCommandTest.php b/core/modules/system/tests/src/Kernel/Scripts/DbDumpCommandTest.php
index a326494..3f6c768 100644
--- a/core/modules/system/tests/src/Kernel/Scripts/DbDumpCommandTest.php
+++ b/core/modules/system/tests/src/Kernel/Scripts/DbDumpCommandTest.php
@@ -52,11 +52,11 @@ public function testDbDumpCommand() {
 
     // Assert that insert exists and that some expected fields exist.
     $output = $command_tester->getDisplay();
-    $this->assertTrue(strpos($output, "createTable('router"), 'Table router found');
-    $this->assertTrue(strpos($output, "insert('router"), 'Insert found');
-    $this->assertTrue(strpos($output, "'name' => 'test"), 'Insert name field found');
-    $this->assertTrue(strpos($output, "'path' => 'test"), 'Insert path field found');
-    $this->assertTrue(strpos($output, "'pattern_outline' => 'test"), 'Insert pattern_outline field found');
+    $this->assertContains("createTable('router", $output, 'Table router found');
+    $this->assertContains("insert('router", $output, 'Insert found');
+    $this->assertContains("'name' => 'test", $output, 'Insert name field found');
+    $this->assertContains("'path' => 'test", $output, 'Insert path field found');
+    $this->assertContains("'pattern_outline' => 'test", $output, 'Insert pattern_outline field found');
   }
 
   /**
@@ -69,20 +69,20 @@ public function testSchemaOnly() {
 
     // Assert that insert statement doesn't exist for schema only table.
     $output = $command_tester->getDisplay();
-    $this->assertTrue(strpos($output, "createTable('router"), 'Table router found');
-    $this->assertFalse(strpos($output, "insert('router"), 'Insert not found');
-    $this->assertFalse(strpos($output, "'name' => 'test"), 'Insert name field not found');
-    $this->assertFalse(strpos($output, "'path' => 'test"), 'Insert path field not found');
-    $this->assertFalse(strpos($output, "'pattern_outline' => 'test"), 'Insert pattern_outline field not found');
+    $this->assertContains("createTable('router", $output, 'Table router found');
+    $this->assertNotContains("insert('router", $output, 'Insert not found');
+    $this->assertNotContains("'name' => 'test", $output, 'Insert name field not found');
+    $this->assertNotContains("'path' => 'test", $output, 'Insert path field not found');
+    $this->assertNotContains("'pattern_outline' => 'test", $output, 'Insert pattern_outline field not found');
 
     // Assert that insert statement doesn't exist for wildcard schema only match.
     $command_tester->execute(['--schema-only' => 'route.*']);
     $output = $command_tester->getDisplay();
-    $this->assertTrue(strpos($output, "createTable('router"), 'Table router found');
-    $this->assertFalse(strpos($output, "insert('router"), 'Insert not found');
-    $this->assertFalse(strpos($output, "'name' => 'test"), 'Insert name field not found');
-    $this->assertFalse(strpos($output, "'path' => 'test"), 'Insert path field not found');
-    $this->assertFalse(strpos($output, "'pattern_outline' => 'test"), 'Insert pattern_outline field not found');
+    $this->assertContains("createTable('router", $output, 'Table router found');
+    $this->assertNotContains("insert('router", $output, 'Insert not found');
+    $this->assertNotContains("'name' => 'test", $output, 'Insert name field not found');
+    $this->assertNotContains("'path' => 'test", $output, 'Insert path field not found');
+    $this->assertNotContains("'pattern_outline' => 'test", $output, 'Insert pattern_outline field not found');
   }
 
 }