Improve test coverage

[dominikschulz]

No description provided.

[codecov]

Codecov Report

Merging #732 into master will increase coverage by 1.8%.
The diff coverage is 60%.

@@            Coverage Diff            @@
##           master     #732     +/-   ##
=========================================
+ Coverage   62.22%   64.02%   +1.8%     
=========================================
  Files         166      166             
  Lines        8877     8879      +2     
=========================================
+ Hits         5523     5684    +161     
+ Misses       2697     2513    -184     
- Partials      657      682     +25

Impacted Files	Coverage Δ
pkg/cui/cui.go	2.33% <0%> (ø)	⬆️
pkg/hibp/dump/scanner.go	71.18% <100%> (+15.29%)	⬆️
pkg/termio/ask.go	75.58% <100%> (ø)	⬆️
main.go	27.69% <80%> (+21.34%)	⬆️
pkg/backend/context.go	100% <0%> (+2.17%)	⬆️
pkg/backend/strings.go	83.87% <0%> (+3.23%)	⬆️
pkg/action/generate.go	64.22% <0%> (+4.59%)	⬆️
pkg/action/otp.go	79.31% <0%> (+6.9%)	⬆️
pkg/cui/recipients.go	55.77% <0%> (+8.33%)	⬆️
... and 11 more

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