tests: increase coverage

[clambin]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 56.36364% with 48 lines in your changes missing coverage. Please review.

Project coverage is 78.90%. Comparing base (c3457ed) to head (5052d6d).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/testutils/testcontainers.go	54.34%	14 Missing and 7 partials ⚠️
internal/cmd/cmd.go	0.00%	13 Missing ⚠️
internal/cmd/scrape.go	56.52%	10 Missing ⚠️
internal/cmd/web.go	84.21%	3 Missing ⚠️
internal/cmd/export.go	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #170      +/-   ##
==========================================
+ Coverage   76.96%   78.90%   +1.94%     
==========================================
  Files          26       27       +1     
  Lines         955     1043      +88     
==========================================
+ Hits          735      823      +88     
+ Misses        195      188       -7     
- Partials       25       32       +7     

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