issues/295: Use testing.Testing() where appropriate

[komuw]

• Fixes: Use testing.Testing(); August 15th 2023 #295

[codecov-commenter]

Codecov Report

Patch coverage: 57.14% and project coverage change: -0.10% ⚠️

Comparison is base (7f64d26) 74.95% compared to head (9aa99f0) 74.86%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #351      +/-   ##
==========================================
- Coverage   74.95%   74.86%   -0.10%     
==========================================
  Files          43       43              
  Lines        4963     4969       +6     
==========================================
  Hits         3720     3720              
- Misses        994      997       +3     
- Partials      249      252       +3     

Files Changed	Coverage Δ
automax/automax.go	50.00% <0.00%> (-50.00%)	⬇️
internal/acme/acme.go	74.48% <33.33%> (-0.60%)	⬇️
internal/acme/helpers.go	65.42% <100.00%> (+0.12%)	⬆️
internal/acme/http_client.go	69.37% <100.00%> (+0.19%)	⬆️

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