Fix CS/WS issues

src/Runner/PhptTestCase.php

@@ -639,6 +639,7 @@ private function cleanupForCoverage(): RawCodeCoverageData
         $files    = $this->getCoverageFiles();
 
         $buffer = false;
+
         if (is_file($files['coverage'])) {
             $buffer = @file_get_contents($files['coverage']);
         }

src/Runner/ResultCache/DefaultResultCache.php

@@ -17,6 +17,7 @@
 use function file_put_contents;
 use function is_array;
 use function is_dir;
+use function is_file;
 use function json_decode;
 use function json_encode;
 use PHPUnit\Framework\TestStatus\TestStatus;
@@ -88,6 +89,7 @@ public function load(): void
         if (!is_file($this->cacheFilename)) {
             return;
         }
+
         $contents = file_get_contents($this->cacheFilename);
 
         if ($contents === false) {

src/TextUI/Application.php

@@ -10,6 +10,7 @@
 namespace PHPUnit\TextUI;
 
 use const PHP_EOL;
+use function is_file;
 use function is_readable;
 use function printf;
 use function realpath;

src/Util/PHP/AbstractPhpProcess.php

@@ -14,6 +14,7 @@
 use function array_merge;
 use function assert;
 use function escapeshellarg;
+use function file_exists;
 use function file_get_contents;
 use function ini_get_all;
 use function restore_error_handler;
@@ -142,6 +143,7 @@ public function runTestJob(string $job, Test $test, string $processResultFile):
 
         if (file_exists($processResultFile)) {
             $processResult = file_get_contents($processResultFile);
+
             @unlink($processResultFile);
         }
 

tests/end-to-end/regression/5764/error-handler.php

@@ -1,7 +1,13 @@
-<?php
-
-// be forgiving with error handlers which do not suppress `@` prefixed lines
-set_error_handler(function(int $err_lvl, string $err_msg, string $err_file, int $err_line): bool {
-    throw new \ErrorException($err_msg, 0, $err_lvl, $err_file, $err_line);
+<?php declare(strict_types=1);
+/*
+ * This file is part of PHPUnit.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+\set_error_handler(static function (int $err_lvl, string $err_msg, string $err_file, int $err_line): bool
+{
+    throw new ErrorException($err_msg, 0, $err_lvl, $err_file, $err_line);
 });
-

tests/end-to-end/regression/5764/tests/Issue5764Test.php

@@ -9,7 +9,6 @@
  */
 namespace PHPUnit\TestFixture\Issue5764;
 
-use Exception;
 use PHPUnit\Framework\TestCase;
 
 final class Issue5764Test extends TestCase