tests: use unique namespace to prevent collisions

Author: staabm

tests/PHPStan/Rules/PhpDoc/IncompatiblePhpDocTypeRuleTest.php

@@ -210,16 +210,14 @@ public function testValueOfEnum(): void
 			$this->markTestSkipped('This test needs PHP 8.1');
 		}
 
-		require __DIR__ . '/data/value-of-enum.php';
-
 		$this->analyse([__DIR__ . '/data/value-of-enum.php'], [
 			[
 				'PHPDoc tag @param for parameter $shouldError with type string is incompatible with native type int.',
-				31,
+				29,
 			],
 			[
 				'PHPDoc tag @param for parameter $shouldError with type int is incompatible with native type string.',
-				38,
+				36,
 			],
 		]);
 	}

tests/PHPStan/Rules/PhpDoc/data/value-of-enum.php

@@ -1,8 +1,6 @@
 <?php // lint >= 8.1
 
-declare(strict_types=1);
-
-namespace ValueOfEnum;
+namespace ValueOfEnumPhpdoc;
 
 enum Country: string
 {