Test that it can read __DIR__

Author: Bellangelo

tests/PHPStan/Rules/Keywords/RequireFileExistsRuleTest.php

@@ -77,4 +77,9 @@ public function testFileDoesNotExistUsingConst(): void
 			],
 		]);
 	}
+
+	public function testFileExistsUsingDIR(): void
+	{
+		$this->analyse([__DIR__ . '/data/file-exists-using-DIR.php'], []);
+	}
 }

tests/PHPStan/Rules/Keywords/data/file-exists-using-DIR.php

@@ -0,0 +1,6 @@
+<?php declare(strict_types=1);
+
+include __DIR__ . '/include-me-to-prove-you-work.txt';
+include_once __DIR__ . '/include-me-to-prove-you-work.txt';
+require __DIR__ . '/include-me-to-prove-you-work.txt';
+require_once __DIR__ . '/include-me-to-prove-you-work.txt';