[Test] Improve test coverage

[fmontesino]

Do not merge before #8

Why?

We want to improve our testing coverage

What?

Added a bunch of missing unit tests I didn't do because I'm lazy 😜

Bonus

I learnt how to use Hilt during tests to replace dependencies. Pretty cool.

[codecov-commenter]

Codecov Report

Merging #9 into main will increase coverage by 9.31%. The diff coverage is n/a.

@@             Coverage Diff              @@
##               main       #9      +/-   ##
============================================
+ Coverage     32.86%   42.17%   +9.31%     
+ Complexity       37       32       -5     
============================================
  Files            18       15       -3     
  Lines           213      147      -66     
  Branches         17       12       -5     
============================================
- Hits             70       62       -8     
+ Misses          139       84      -55     
+ Partials          4        1       -3     

Impacted Files	Coverage Δ	Complexity Δ
...feature/manager/viewmodel/ProxyManagerViewModel.kt	100.00% <ø> (ø)	7.00 <0.00> (ø)
...ain/java/com/kinandcarta/create/proxytoggle/App.kt	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
...reate/proxytoggle/feature/tile/ProxyTileService.kt	0.00% <0.00%> (-89.48%)	0.00% <0.00%> (-8.00%)
...proxytoggle/feature/widget/ToggleWidgetProvider.kt	0.00% <0.00%> (-2.95%)	0.00% <0.00%> (-1.00%)
...inandcarta/create/proxytoggle/model/ProxyMapper.kt	85.71% <0.00%> (+14.28%)	5.00% <0.00%> (+1.00%)
...oggle/broadcast/ProxyUpdateListenerProviderImpl.kt	100.00% <0.00%> (+100.00%)	2.00% <0.00%> (+2.00%)
...ture/widget/broadcast/WidgetProxyUpdateListener.kt	100.00% <0.00%> (+100.00%)	2.00% <0.00%> (+2.00%)