tests: (un)equip command

[midgleyc]

Tests for unequipping and equipping things, especially folders, as this involves arithmetic with slots.

[codecov]

Codecov Report

Merging #1509 (7f95c9f) into main (4e47f94) will increase coverage by 0.02%.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1509      +/-   ##
============================================
+ Coverage     34.81%   34.83%   +0.02%     
- Complexity    17433    17450      +17     
============================================
  Files          1063     1063              
  Lines        163296   163296              
  Branches      34928    34928              
============================================
+ Hits          56846    56887      +41     
+ Misses        96911    96866      -45     
- Partials       9539     9543       +4     

Impacted Files	Coverage Δ
.../net/sourceforge/kolmafia/objectpool/ItemPool.java	14.28% <ø> (ø)
...sourceforge/kolmafia/session/EquipmentManager.java	40.06% <0.00%> (+0.08%)	⬆️
...eforge/kolmafia/persistence/EquipmentDatabase.java	74.01% <0.00%> (+0.21%)	⬆️
...lmafia/swingui/widget/ListCellRendererFactory.java	29.57% <0.00%> (+1.40%)	⬆️
...sourceforge/kolmafia/request/EquipmentRequest.java	31.33% <0.00%> (+2.09%)	⬆️
...eforge/kolmafia/textui/command/UnequipCommand.java	71.42% <0.00%> (+57.14%)	⬆️

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[gausie]

Awesome, and definitely get merged before the slot enum changes as I imagine was your intention!