Merge branch '6.0' into 6.1

* 6.0:
  [String] Add tests for AsciiSlugger
  [Serializer] Fix get accessor regex in AnnotationLoader
  [HttpKernel] Fix passing `null` to `\trim()` method in LoggerDataCollector
  Remove wrong PHPDoc
  [Translation] Crowdin provider throw Exception when status is 50x
  Always attempt to listen for notifications
  add missing changelog entry for the AtLeastOneOf constraint
  validate nested constraints only if they are in the same group

Author: fabpot

Tests/Slugger/AsciiSluggerTest.php

@@ -0,0 +1,47 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\String;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\String\Slugger\AsciiSlugger;
+
+class AsciiSluggerTest extends TestCase
+{
+    public function provideSlugTests(): iterable
+    {
+        yield ['', ''];
+        yield ['foo', ' foo '];
+        yield ['foo-bar', 'foo bar'];
+
+        yield ['foo-bar', 'foo@bar', '-'];
+        yield ['foo-at-bar', 'foo@bar', '-', 'en'];
+
+        yield ['e-a', 'é$!à'];
+        yield ['e_a', 'é$!à', '_'];
+
+        yield ['a', 'ä'];
+        yield ['a', 'ä', '-', 'fr'];
+        yield ['ae', 'ä', '-', 'de'];
+        yield ['ae', 'ä', '-', 'de_fr']; // Ensure we get the parent locale
+        yield ['g', 'ғ', '-'];
+        yield ['gh', 'ғ', '-', 'uz'];
+        yield ['gh', 'ғ', '-', 'uz_fr']; // Ensure we get the parent locale
+    }
+
+    /** @dataProvider provideSlugTests */
+    public function testSlug(string $expected, string $string, string $separator = '-', string $locale = null)
+    {
+        $slugger = new AsciiSlugger();
+
+        $this->assertSame($expected, (string) $slugger->slug($string, $separator, $locale));
+    }
+}