It is important to test your site with a range of users and the hardware and software they use to access the web. This should include users with a disability who use adaptive technologies. For example, vision impaired students who use screen readers will be able to give you feedback on how your site comes across via their adaptive technologies.
Testing with real users can also provide useful feedback on the clarity of language and ease of navigation since automatic tools, while they are quick and convenient, cannot identify all the accessibility barriers.