Report formats

simple

specification:
  - scenario
    + Steps
!! but fails with:
... filename.lua:line: error
[ fail (1/2) ]

markdown

### specification
##### … scenario
 1. Step
 2. ~~failing step~~  
    Fail with:

    > ...filename.lua:line: error

TAP

https://testanything.org/

# describe specification (1/2):
ok 1 - scenario
not ok 1 - failed scenario
# - Steps
# ! it fails with:
# !...filename.lua:line: error