WIP

tests/Core/Autoloader/ReloadWithDifferentCaseTest.php

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+<?php
+/**
+ * Tests for the \PHP_CodeSniffer\Autoload::determineLoadedClass method.
+ *
+ * @author    Juliette Reinders Folmer <phpcs_nospam@adviesenzo.nl>
+ * @copyright 2006-2023 Squiz Pty Ltd (ABN 77 084 670 600)
+ * @license   https://github.com/squizlabs/PHP_CodeSniffer/blob/master/licence.txt BSD Licence
+ */
+
+namespace PHP_CodeSniffer\Tests\Core\Autoloader;
+
+use PHP_CodeSniffer\Autoload;
+use PHPUnit\Framework\TestCase;
+
+class ReloadWithDifferentCaseTest extends TestCase
+{
+
+
+    /**
+     * Test.
+     *
+     * @return void
+     */
+    public function testNoFatalErrorWhenSecondIncludeUsesDifferentCaseFromFile()
+    {
+        // Load the file using the correct class name case first.
+        $this->assertTrue(Autoload::load('PHP_CodeSniffer\Tests\Core\Autoloader\CaseInsensitive'));
+
+        // Now, attempt to load the file a second time, using the incorrect case.
+        // This should not result in a fatal error.
+        $this->assertFalse(Autoload::load('PHP_CodeSniffer\Tests\Core\Autoloader\caseinsensitive'));
+
+    }//end testNoFatalErrorWhenSecondIncludeUsesDifferentCaseFromFile()
+
+
+}//end class

tests/Core/Autoloader/TestFiles/CaseInsensitive.inc

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+<?php
+namespace PHP_CodeSniffer\Tests\Core\Autoloader;
+class CaseInsensitive {}