test($compile): use FQDN for img[src]

img[src]="https://foo" has the unfortunate problem that the browser will
actually try retrieving the resource the non FQDN foo.  The local DNS
might suffix a domain to this, resolve it, and try to present a
certificate for the https request and prompt the user to pick a
certificate. This commit avoids that by making foo a FQDN.  Note that it
might be better to replace foo with example.com (ref
http://tools.ietf.org/html/rfc2606#section-3).