Remove test

Author: Nicolas Oelgart

tests/Php80/Php80Test.php

@@ -81,16 +81,6 @@ public function testPregMalformedUtfError()
         $this->assertSame('Malformed UTF-8 characters, possibly incorrectly encoded', preg_last_error_msg());
     }
 
-    /**
-     * @requires PHP 7.0
-     * @covers \Symfony\Polyfill\Php80\Php80::pregLastErrorMsg
-     */
-    public function testPregInternalError()
-    {
-        @preg_match('/(?<)/', 'Hello world');
-        $this->assertSame('Internal error', preg_last_error_msg());
-    }
-
     /**
      * @requires PHP 7.0
      * @covers \Symfony\Polyfill\Php80\Php80::pregLastErrorMsg