Test that it cannot read functions

Author: Bellangelo

tests/PHPStan/Rules/Keywords/RequireFileExistsRuleTest.php

@@ -97,4 +97,9 @@ public function testFileDoesNotExistButUsesClassMethods(): void
 	{
 		$this->analyse([__DIR__ . '/data/file-does-not-exist-but-uses-a-class-method.php'], []);
 	}
+
+	public function testFileDoesNotExistButUsesAFunction(): void
+	{
+		$this->analyse([__DIR__ . '/data/file-does-not-exist-but-uses-a-function.php'], []);
+	}
 }

tests/PHPStan/Rules/Keywords/data/file-does-not-exist-but-uses-a-function.php

@@ -0,0 +1,11 @@
+<?php declare(strict_types=1);
+
+function getFileThatDoesNotExist(): string
+{
+    return 'a_file_that_does_not_exist.txt';
+}
+
+include __DIR__ . '/' . getFileThatDoesNotExist();
+include_once __DIR__ . '/' . getFileThatDoesNotExist();
+require __DIR__ . '/' . getFileThatDoesNotExist();
+require_once __DIR__ . '/' . getFileThatDoesNotExist();