Refactor view_with_permissions as a utility function

[florimondmanca]

Prompted by #102 (comment)

[codecov-io]

Codecov Report

Merging #106 into master will increase coverage by 0.22%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #106      +/-   ##
=========================================
+ Coverage   96.37%   96.6%   +0.22%     
=========================================
  Files          21      22       +1     
  Lines         469     471       +2     
=========================================
+ Hits          452     455       +3     
+ Misses         17      16       -1

Impacted Files	Coverage Δ
tests/conftest.py	98.03% <ø> (-0.35%)	⬇️
tests/test_permissions_custom.py	100% <100%> (ø)	⬆️
tests/test_permissions.py	98.36% <100%> (+0.02%)	⬆️
tests/utils.py	100% <100%> (ø)
tests/test_permissions_combination.py	100% <100%> (ø)	⬆️

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