Print new line only if message is not empty

Author: lyrixx

src/Runner/ShutdownHandler.php

@@ -46,7 +46,13 @@ private static function register(): void
         register_shutdown_function(
             static function (): void
             {
-                print rtrim(self::$message) . PHP_EOL;
+                $message = rtrim(self::$message);
+
+                if ($message === '') {
+                    return;
+                }
+
+                print self::$message . PHP_EOL;
             },
         );
     }

tests/end-to-end/cli/shutdown-handler/WithExitTest.php

@@ -0,0 +1,31 @@
+<?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.
+ */
+namespace PHPUnit\TestFixture;
+
+use PHPUnit\Framework\TestCase;
+
+final class WithExitTest extends TestCase
+{
+    public function testWithMessage(): void
+    {
+        $this->assertTrue(true);
+        $this->assertTrue(true);
+
+        exit('My Custom Exit Message');
+    }
+
+    public function testWithoutMessage(): void
+    {
+        $this->assertTrue(true);
+        $this->assertTrue(true);
+
+        exit(1);
+    }
+}

tests/end-to-end/cli/shutdown-handler/test.phpt

@@ -0,0 +1,25 @@
+--TEST--
+--FILE--
+<?php
+$phpunit = __DIR__ . '/../../../../phpunit';
+passthru(\sprintf('php %s --do-not-cache-result --no-configuration %s/WithExitTest.php --filter testWithMessage',$phpunit, __DIR__,));
+echo "\n------\n";
+passthru(\sprintf('php %s --do-not-cache-result --no-configuration %s/WithExitTest.php --filter testWithoutMessage',$phpunit, __DIR__,));
+echo "\n------\n";
+echo PHP_EOL;
+--EXPECTF--
+%s by Sebastian Bergmann and contributors.
+
+Runtime: %s
+
+My Custom Exit MessageFatal error: Premature end of PHP process when running PHPUnit\TestFixture\WithExitTest::testWithMessage.
+
+------
+%s by Sebastian Bergmann and contributors.
+
+Runtime: %s
+
+Fatal error: Premature end of PHP process when running PHPUnit\TestFixture\WithExitTest::testWithoutMessage.
+
+------
+