Fix CS

tests/Monolog/ErrorHandlerTest.php

@@ -28,7 +28,8 @@ class ErrorHandlerTest extends \PHPUnit\Framework\TestCase
         $logger = new Logger('test', [$handler = new TestHandler]);
         $errHandler = new ErrorHandler($logger);
 
-        $phpunitHandler = set_error_handler($prevHandler = function() {});
+        $phpunitHandler = set_error_handler($prevHandler = function () {
+        });
 
         try {
             $errHandler->registerErrorHandler([], true);

tests/Monolog/Handler/NativeMailerHandlerTest.php

@@ -13,7 +13,6 @@ namespace Monolog\Handler;
 
 use Monolog\Test\TestCase;
 use Monolog\Logger;
-use InvalidArgumentException;
 
 function mail($to, $subject, $message, $additional_headers = null, $additional_parameters = null)
 {

tests/Monolog/UtilsTest.php

@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 /*
  * This file is part of the Monolog package.