I have a class that returns a `Zend\Db\Sql\Select` object.

Inside the test with phpunit I try to get the sql string via

```
var_dump($select->getSqlString());

```

But I get an error message:

```
Attempting to quote a value without specific driver level 
support can introduce security vulnerabilities in a 
production environment.

```

Inside my bootstrap for phpunit I define

```
putenv('APP_ENV=test');

```

I also tried

```
var_dump($select->getSqlString(new \Zend\Db\Adapter\Platform\Mysql()));

```

but get a similar error

```
Attempting to quote a value in Zend\Db\Adapter\Platform\Mysql
without extension/driver support can introduce security
vulnerabilities in a production environment.

```

What can I do to get the string in my test without a database adapter/driver?