The tests hang if called with both --pixel and --reset. The problem is that DRT and the script disagree on when the PNG dump is going to happen, so the scripts ends up treating a PNG dump as if it were text output.
This regressed in bug 21124.
Created attachment 24038 [details]
Comment on attachment 24038 [details]
r37269 = f415948b7306d75e3ffe5fcaaa0a86f040eef251 (trunk)