Auth tests

[0xTim]

Improve test coverage around BlogAdminController

[codecov]

Codecov Report

Merging #14 into master will increase coverage by 25.14%.
The diff coverage is 84.21%.

@@             Coverage Diff             @@
##           master      #14       +/-   ##
===========================================
+ Coverage   45.33%   70.47%   +25.14%     
===========================================
  Files          15       14        -1     
  Lines        1458     1460        +2     
===========================================
+ Hits          661     1029      +368     
+ Misses        797      431      -366

Impacted Files	Coverage Δ
Sources/SteamPress/Models/BlogTag.swift	91.66% <ø> (+7.05%)	⬆️
Sources/SteamPress/Models/BlogPost.swift	90.74% <ø> (+3.39%)	⬆️
Sources/SteamPress/Models/BlogUser.swift	100% <ø> (ø)	⬆️
...ources/SteamPress/Controllers/BlogController.swift	83.33% <100%> (ø)	⬆️
...rces/SteamPress/Validators/UsernameValidator.swift	100% <100%> (+100%)	⬆️
...s/Middleware/BlogLoginRedirectAuthMiddleware.swift	100% <100%> (+33.33%)	⬆️
...s/SteamPress/Controllers/BlogAdminController.swift	84.61% <100%> (+72.81%)	⬆️
Sources/SteamPress/Provider.swift	5.05% <60%> (+5.05%)	⬆️
... and 4 more

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