diff --git a/tests/system/CommonFunctionsSendTest.php b/tests/system/CommonFunctionsSendTest.php
index 462303aa68b9..f26e40cadf14 100644
--- a/tests/system/CommonFunctionsSendTest.php
+++ b/tests/system/CommonFunctionsSendTest.php
@@ -45,7 +45,7 @@ public function testRedirectResponseCookiesSent(): void
 
         $response = redirect()->route('login')
             ->setCookie('foo', 'onething', YEAR)
-            ->setCookie('login_time', $loginTime, YEAR);
+            ->setCookie('login_time', (string) $loginTime, YEAR);
         $response->pretend(false);
         $this->assertTrue($response->hasCookie('foo', 'onething'));
         $this->assertTrue($response->hasCookie('login_time'));
diff --git a/tests/system/CommonFunctionsTest.php b/tests/system/CommonFunctionsTest.php
index 176b21def156..7dc3be9b1ae5 100644
--- a/tests/system/CommonFunctionsTest.php
+++ b/tests/system/CommonFunctionsTest.php
@@ -578,7 +578,7 @@ public function testRedirectResponseCookies1(): void
 
         $answer1 = redirect()->route('login')
             ->setCookie('foo', 'onething', YEAR)
-            ->setCookie('login_time', $loginTime, YEAR);
+            ->setCookie('login_time', (string) $loginTime, YEAR);
 
         $this->assertTrue($answer1->hasCookie('foo', 'onething'));
         $this->assertTrue($answer1->hasCookie('login_time'));
diff --git a/tests/system/Debug/Toolbar/Collectors/HistoryTest.php b/tests/system/Debug/Toolbar/Collectors/HistoryTest.php
index fdc1ff0e5e9d..94297c6d1c63 100644
--- a/tests/system/Debug/Toolbar/Collectors/HistoryTest.php
+++ b/tests/system/Debug/Toolbar/Collectors/HistoryTest.php
@@ -63,7 +63,7 @@ private function createDummyDebugbarJson(): void
 
         // create 20 dummy debugbar json files
         for ($i = 0; $i < 20; $i++) {
-            $path = str_replace($time, sprintf('%.6f', $time - self::STEP), $path);
+            $path = str_replace((string) $time, sprintf('%.6f', $time - self::STEP), $path);
             file_put_contents($path, json_encode($dummyData));
             $time = sprintf('%.6f', $time - self::STEP);
         }
diff --git a/tests/system/HTTP/ResponseSendTest.php b/tests/system/HTTP/ResponseSendTest.php
index 0d10d8b91090..5e46b341a288 100644
--- a/tests/system/HTTP/ResponseSendTest.php
+++ b/tests/system/HTTP/ResponseSendTest.php
@@ -129,9 +129,11 @@ public function testRedirectResponseCookies(): void
 
         $answer1 = $response->redirect('/login')
             ->setCookie('foo', 'bar', YEAR)
-            ->setCookie('login_time', $loginTime, YEAR);
+            ->setCookie('login_time', (string) $loginTime, YEAR);
+
         $this->assertTrue($answer1->hasCookie('foo', 'bar'));
         $this->assertTrue($answer1->hasCookie('login_time'));
+
         $response->setBody('Hello');
 
         // send it
diff --git a/tests/system/HTTP/ResponseTest.php b/tests/system/HTTP/ResponseTest.php
index 0a5373c2d17f..f8de63d1f1b0 100644
--- a/tests/system/HTTP/ResponseTest.php
+++ b/tests/system/HTTP/ResponseTest.php
@@ -553,7 +553,7 @@ public function testRedirectResponseCookies(): void
         $response = new Response(new App());
         $answer1  = $response->redirect('/login')
             ->setCookie('foo', 'bar', YEAR)
-            ->setCookie('login_time', $loginTime, YEAR);
+            ->setCookie('login_time', (string) $loginTime, YEAR);
 
         $this->assertTrue($answer1->hasCookie('foo'));
         $this->assertTrue($answer1->hasCookie('login_time'));
diff --git a/tests/system/Helpers/CookieHelperTest.php b/tests/system/Helpers/CookieHelperTest.php
index 22f188af5d31..f305173b7109 100755
--- a/tests/system/Helpers/CookieHelperTest.php
+++ b/tests/system/Helpers/CookieHelperTest.php
@@ -252,10 +252,12 @@ public function testSameSiteParamArray(): void
 
     public function testSameSiteParam(): void
     {
-        set_cookie($this->name, $this->value, $this->expire, '', '', '', '', '', 'Strict');
+        set_cookie($this->name, $this->value, $this->expire, '', '', '', null, null, 'Strict');
 
         $this->assertTrue($this->response->hasCookie($this->name));
+
         $theCookie = $this->response->getCookie($this->name);
+
         $this->assertSame('Strict', $theCookie->getSameSite());
 
         delete_cookie($this->name);
diff --git a/tests/system/Helpers/FilesystemHelperTest.php b/tests/system/Helpers/FilesystemHelperTest.php
index 26d199c29dfc..8164e5e7b6df 100644
--- a/tests/system/Helpers/FilesystemHelperTest.php
+++ b/tests/system/Helpers/FilesystemHelperTest.php
@@ -94,7 +94,7 @@ public function testDirectoryMapShowsHiddenFiles(): void
         $root = vfsStream::setup('root', null, $this->structure);
         $this->assertTrue($root->hasChild('foo'));
 
-        $this->assertSame($expected, directory_map(vfsStream::url('root'), false, true));
+        $this->assertSame($expected, directory_map(vfsStream::url('root'), 0, true));
     }
 
     public function testDirectoryMapLimitsRecursion(): void
diff --git a/tests/system/Helpers/TextHelperTest.php b/tests/system/Helpers/TextHelperTest.php
index 3ae32bf9e1bc..1cc4def05869 100755
--- a/tests/system/Helpers/TextHelperTest.php
+++ b/tests/system/Helpers/TextHelperTest.php
@@ -138,7 +138,7 @@ public function testIncrementString(): void
         $this->assertSame('file_5', increment_string('file_4'));
         $this->assertSame('file-5', increment_string('file-4', '-'));
         $this->assertSame('file-5', increment_string('file-4', '-'));
-        $this->assertSame('file-1', increment_string('file', '-', '1'));
+        $this->assertSame('file-1', increment_string('file', '-', 1));
         $this->assertSame('124', increment_string('123', ''));
     }