public function test_execute() { // $parser = (new ParserFactory())->create(ParserFactory::PREFER_PHP7); $parser = new Parser(new Lexer()); $printer = new Standard(); $visitor = new WhitelistVisitor(); $sandbox = new Sandbox($visitor, $parser, $printer); $code = ' $a = 1+1; return $a; '; $res = $sandbox->execute($code); $this->assertEquals(2, $res); }