diff --git a/test.php b/test.php
deleted file mode 100644
index 3e51f3be13f..00000000000
--- a/test.php
+++ /dev/null
@@ -1,23 +0,0 @@
-<?php declare(strict_types = 1);
-
-use function PHPStan\Testing\assertType;
-
-class Foo {}
-class Bar {}
-
-class HelloWorld
-{
-	/**
-	 * @param array{1?: ?int, 2?: string} $a1
-	 * @param array{Foo, Bar} $a2
-	 * @param array{1?: int, 2?: string}|int $a3
-	 */
-	public function constantArrayUnion($a1, $a2, $a3, array $a4): void
-	{
-		if ($a1 === []) {
-			return;
-		}
-		// assertType('array{0: Foo, 1: Bar|int|null, 2?: string} ', $a1 + $a2);
-		assertType('array{}', $a3 + $a4);
-	}
-}