DRY up the HTML render tests
DRY up the HTML render tests

Along the lines of 85d4bdd but for the HTML render object

kaneshin/redcarpet,emq/redcarpet,emq/redcarpet,increments/greenmat,emq/redcarpet,liquorburn/redcarpet,increments/greenmat,vmg/redcarpet,kattybilly/redcarpet,kaneshin/redcarpet,liquorburn/redcarpet,Hacker0x01/redcarpet,vmg/redcarpet,vmg/redcarpet,be9/redcarpet,kaneshin/redcarpet,kattybilly/redcarpet,fukayatsu/redcarpet,emq/redcarpet,fukayatsu/redcarpet,kattybilly/redcarpet,kattybilly/redcarpet,liquorburn/redcarpet,increments/greenmat,Hacker0x01/redcarpet,fukayatsu/redcarpet,vmg/redcarpet,liquorburn/redcarpet,Hacker0x01/redcarpet,be9/redcarpet,Hacker0x01/redcarpet,be9/redcarpet,increments/greenmat,kaneshin/redcarpet,be9/redcarpet,fukayatsu/redcarpet