[stable13] Fix the unit tests

[MorrisJobke]

Backport of #9711

[codecov]

Codecov Report

Merging #9712 into stable13 will increase coverage by 20.39%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##             stable13    #9712       +/-   ##
===============================================
+ Coverage       31.04%   51.43%   +20.39%     
  Complexity      25130    25130               
===============================================
  Files            1613     1613               
  Lines           95617    95617               
  Branches         1376     1376               
===============================================
+ Hits            29680    49185    +19505     
+ Misses          65937    46432    -19505

Impacted Files	Coverage Δ	Complexity Δ
core/js/js.js	65.81% <0%> (-0.56%)	0% <0%> (ø)
lib/private/Files/Storage/DAV.php	65.4% <0%> (+0.21%)	163% <0%> (ø)	⬇️
lib/private/Files/Stream/Encryption.php	75.22% <0%> (+0.45%)	54% <0%> (ø)	⬇️
apps/theming/lib/ThemingDefaults.php	92.25% <0%> (+0.64%)	54% <0%> (ø)	⬇️
lib/private/Setup.php	12.76% <0%> (+0.85%)	50% <0%> (ø)	⬇️
lib/private/legacy/image.php	37.95% <0%> (+0.87%)	213% <0%> (ø)	⬇️
lib/public/AppFramework/Db/Mapper.php	99.12% <0%> (+0.87%)	30% <0%> (ø)	⬇️
lib/private/Group/Group.php	88.88% <0%> (+0.92%)	52% <0%> (ø)	⬇️
...vate/Authentication/Token/DefaultTokenProvider.php	98.03% <0%> (+0.98%)	32% <0%> (ø)	⬇️
lib/private/App/DependencyAnalyzer.php	95.59% <0%> (+1.25%)	63% <0%> (ø)	⬇️
... and 376 more