The 2015 Edition Final Test Method has been posted and can be accessed on the ONC Health IT Certification Program webpage.

The Final Test Method outlines the requirements for evaluating conformance of health IT Modules to the certification criteria defined in the ONC 2015 Edition Final Rule (45 CFR Part 170 Subpart II) published in the Federal Register on October 16, 2015.

The ONC-approved test procedures are constructed in an outcome-focused format with complementary companion guide documents to aid stakeholder development of health IT Modules. The Test Method includes test procedures developed by ONC, and test data and conformance test tools developed by partnering agencies.

Here is a link to the final test method site:
https://www.healthit.gov/policy-researchers-implementers/2015-edition-te...

and here is a direct link to a guide tothe Safety-Enhanced Design (aka Usability testing):

https://www.healthit.gov/sites/default/files/2015Ed_CCG_g3-Safety-enhanc...