>>> Download the Arabic Typesetting font and install it on your system to establish a baseline expectation for the result (see the Installed font text below). This helps identify failures caused due to lack of rendering support at the OS level.

>>> Set the default fonts on the user agent so that the reference graphic doesn't look like the system default font text (shown below). Otherwise, you cannot be sure whether the test has passed or failed.

Check that (a) the text below looks identical to the installed font text, and (b) the installed font text looks the same as the reference graphic.