Since I wanted to test fuzzy CD lookup, I picked a CDStub (so its discid is not in main db and I can just pick the discid + toc information).

So first step, test a simple lookup:
http://test.musicbrainz.org/ws/2/discid/Rk4KQZMcPY5Dj0L00Hyd9Y4lYdo- => OK

Second step, add the toc parameter, it shouldn't change the results
http://test.musicbrainz.org/ws/2/discid/Rk4KQZMcPY5Dj0L00Hyd9Y4lYdo-?toc=1+12+240687+150+19656+40525+59754+81260+98921+112765+141108+155213+177969+207211+223566 => No result!!

Third step, add the toc parameter, it shouldn't change the results
http://test.musicbrainz.org/ws/2/discid/Rk4KQZMcPY5Dj0L00Hyd9Y4lYdo-?toc=1+12+240687+150+19656+40525+59754+81260+98921+112765+141108+155213+177969+207211+223566&cdstubs=no => Not better, no fuzzy lookup is done