R version 4.5.0 alpha (2025-03-24 r88048 ucrt)
Copyright (C) 2025 The R Foundation for Statistical Computing
Platform: x86_64-w64-mingw32/x64

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Type 'contributors()' for more information and
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> library(testthat)
> library(docopt)
> 
> test_check("docopt")
Naval Fate.

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Usage:
  naval_fate ship new <name>...
  naval_fate ship <name> move <x> <y> [--speed=<kn>]
  naval_fate ship shoot <x> <y>
  naval_fate mine (set|remove) <x> <y> [--moored|--drifting]
  naval_fate -h | --help
  naval_fate --version

Options:
  -h --help     Show this screen.
  --version     Show version.
  --speed=<kn>  Speed in knots [default: 10].
  --moored      Moored (anchored) mine.
  --drifting    Drifting mine. 
 
Usage: prog 
Usage: prog [options]

Options: -a  All. 
Usage: prog [options]

Options: --all  All. 
usage: prog -a -b

options:
 -a
 -b 
usage: prog -a -b

options:
 -a
 -b 
usage: prog (-a -b)

options: -a
         -b 
usage: prog (-a -b)

options: -a
         -b 
usage: prog [-a] -b

options: -a
 -b 
usage: prog [-a] -b

options: -a
 -b 
usage: prog [(-a -b)]

options: -a
         -b 
usage: prog [(-a -b)]

options: -a
         -b 
usage: prog (-a|-b)

options: -a
         -b 
usage: prog (-a|-b)

options: -a
         -b 
usage: prog [ -a | -b ]

options: -a
         -b 
usage: prog <arg> 
usage: prog <arg> 
usage: prog [<arg>] 
usage: prog <kind> <name> <type> 
usage: prog <kind> <name> <type> 
usage: prog <kind> [<name> <type>] 
usage: prog [<kind> | <name> <type>] 
usage: prog (<kind> --all | <name>)

options:
 --all 
usage: prog [(<name> <name>)] 
usage: prog NAME... 
Usage: prog -v ... 
Usage: prog [-v | -vv | -vvv]

This one is probably most readable user-friednly variant. 
usage: prog [go go] 
usage: prog go... 
[ FAIL 0 | WARN 0 | SKIP 7 | PASS 284 ]

══ Skipped tests (7) ═══════════════════════════════════════════════════════════
• not implemented (7): 'test-specs.R:1352:7', 'test-specs.R:1394:7',
  'test-specs.R:1403:7', 'test-specs.R:1426:7', 'test-specs.R:1435:7',
  'test-specs.R:1787:7', 'test-specs.R:1804:5'

[ FAIL 0 | WARN 0 | SKIP 7 | PASS 284 ]
> 
> proc.time()
   user  system elapsed 
   3.43    0.17    3.59