diff --git a/composer.json b/composer.json
index 27bd3ebd1..4b0828e91 100644
--- a/composer.json
+++ b/composer.json
@@ -60,6 +60,7 @@
         "masterminds/html5": "^2.7",
         "matthiasnoback/symfony-dependency-injection-test": "^4.1.1 || ^5.0",
         "phpstan/extension-installer": "^1.0",
+        "phpstan/phpdoc-parser": "^1.0",
         "phpstan/phpstan": "^1.0",
         "phpstan/phpstan-phpunit": "^1.0",
         "phpstan/phpstan-strict-rules": "^1.3",
diff --git a/tests/Model/PageTest.php b/tests/Model/PageTest.php
index 8a443fff2..29086264e 100644
--- a/tests/Model/PageTest.php
+++ b/tests/Model/PageTest.php
@@ -70,7 +70,7 @@ public function testHeader(): void
         static::assertSame($page->getHeaders(), $expectedHeaders);
 
         $page->setHeaders(['Cache-Control' => 'no-cache']);
-        static::assertSame($page->getRawHeaders(), 'Cache-Control: no-cache');
+        static::assertSame('Cache-Control: no-cache', $page->getRawHeaders());
         static::assertSame($page->getHeaders(), ['Cache-Control' => 'no-cache']);
 
         $page->setHeaders([]);
@@ -83,7 +83,7 @@ public function testHeader(): void
         static::assertSame($page->getHeaders(), $expectedHeaders);
 
         $page->setRawHeaders('Cache-Control: no-cache');
-        static::assertSame($page->getRawHeaders(), 'Cache-Control: no-cache');
+        static::assertSame('Cache-Control: no-cache', $page->getRawHeaders());
         static::assertSame($page->getHeaders(), ['Cache-Control' => 'no-cache']);
 
         $page->setRawHeaders('');
@@ -92,7 +92,7 @@ public function testHeader(): void
 
         $page = new Page();
         $page->addHeader('Cache-Control', 'no-cache');
-        static::assertSame($page->getRawHeaders(), 'Cache-Control: no-cache');
+        static::assertSame('Cache-Control: no-cache', $page->getRawHeaders());
         static::assertSame($page->getHeaders(), ['Cache-Control' => 'no-cache']);
 
         $page->setRawHeaders($expectedStringHeaders);