Add test

Author: VincentLanglet

tests/PHPStan/Analyser/nsrt/bug-7106.php

@@ -5,18 +5,22 @@
 namespace Bug7106;
 
 use function PHPStan\Testing\assertType;
+use function PHPStan\Testing\assertNativeType;
 use function openssl_error_string;
 
 Class Example
 {
     public function openSslError(string $signature): string
     {
         assertType('string|false', openssl_error_string());
+        assertNativeType('string|false', openssl_error_string());
 
         if (false === \openssl_error_string()) {
             assertType('false', openssl_error_string());
+            assertNativeType('false', openssl_error_string());
             openssl_sign('1', $signature, '');
             assertType('string|false', openssl_error_string());
+            assertNativeType('string|false', openssl_error_string());
         }
     }
 }