Yes. If you have a test site under as another subdomain, you can index it as well for testing purpose.
For non-wordpress site, you don’t need to install our javascript tag to the html header right after your site is indexed. Instead, you can download our chrome plugin and paste our javascript tag there. This way, you can see your site working with our SearchIQ before you decide putting our tag to the header of your site.
Chrome plugin download link: https://www.dropbox.com/s/r31crgiltxie9q6/replace-url.zip?dl=0