Add the cameras to the POCS tests

[wtgee]

This was missed during #612 but is also indicative of #645.

[codecov]

Codecov Report

Merging #646 into develop will increase coverage by 3.43%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #646      +/-   ##
===========================================
+ Coverage    65.64%   69.08%   +3.43%     
===========================================
  Files           66       65       -1     
  Lines         5792     5702      -90     
  Branches       810      798      -12     
===========================================
+ Hits          3802     3939     +137     
+ Misses        1780     1553     -227     
  Partials       210      210

Impacted Files	Coverage Δ
pocs/serial_handlers/protocol_arduinosimulator.py	75.28% <0%> (-1.55%)	⬇️
peas/webcam.py
pocs/mount/simulator.py	92.79% <0%> (+1.8%)	⬆️
pocs/mount/mount.py	59.19% <0%> (+2.57%)	⬆️
pocs/utils/images/fits.py	82.95% <0%> (+3.97%)	⬆️
pocs/camera/camera.py	90% <0%> (+5.26%)	⬆️
pocs/camera/simulator.py	100% <0%> (+5.45%)	⬆️
pocs/images.py	91.81% <0%> (+7.27%)	⬆️
pocs/state/states/default/scheduling.py	66.66% <0%> (+8.33%)	⬆️
pocs/observatory.py	87.95% <0%> (+12.37%)	⬆️
... and 5 more

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[wtgee]

That's the kind of test coverage bump I want...

[jamessynge]

Can't really tell what the effect of this change is.

[jamessynge]

Though I do see that coverage has gone up by more than 1%. Pretty good!

[jamessynge]

Approving because of the coverage increase alone, without fully understanding the impact.

Maybe add some comments in the new fixture?

[wtgee]

Can't really tell what the effect of this change is.

This was merely a fix that should have been put in place with #612 (the camera dependency injection). Without this change the Observatory object is not getting passed any cameras so was erroring.

Which, now that I write that, means that we should have a check in the Observatory such that it cannot leave the ready state if there are no cameras attached. Edit: added #651