test: add basic renderer tests

[piksel]

add tests for the expected output of the markdown and console renderers

[codecov]

Codecov Report

Merging #191 (9c1cbc3) into main (265789c) will increase coverage by 4.36%.
The diff coverage is 85.00%.

@@            Coverage Diff             @@
##             main     #191      +/-   ##
==========================================
+ Coverage   64.18%   68.55%   +4.36%     
==========================================
  Files          87       88       +1     
  Lines        2770     2776       +6     
==========================================
+ Hits         1778     1903     +125     
+ Misses        840      701     -139     
- Partials      152      172      +20     

Impacted Files	Coverage Δ
pkg/format/render_markdown.go	50.73% <78.57%> (+50.73%)	⬆️
pkg/format/node.go	91.36% <100.00%> (+0.19%)	⬆️
pkg/format/renderer.go	100.00% <100.00%> (ø)
pkg/format/format_colorize.go	34.48% <0.00%> (+3.44%)	⬆️
pkg/format/urlpart_string.go	10.00% <0.00%> (+10.00%)	⬆️
pkg/format/field_info.go	75.55% <0.00%> (+11.11%)	⬆️
pkg/format/render_console.go	68.42% <0.00%> (+32.89%)	⬆️
pkg/format/urlpart.go	44.44% <0.00%> (+44.44%)	⬆️

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