Added tests on targets

[cosimoNigro]

This PR adds mote tests on the targets.py submodule.

[sourcery-ai[bot]]

Sourcery Code Quality Report (beta)

✅ Merging this PR will increase code quality in the affected files by 0.04 out of 10.

	Before	After	Change
Quality	8.65	8.68	0.04
Complexity	0.63	0.45	-0.18
Method Length	58.71	56.89	-1.82
Lines	488	699	211

Changed files	Quality Before	Quality After	Quality Change
agnpy/targets.py	8.34	8.34	0.0
agnpy/tests/test_targets.py	9.23	8.99	-0.24 ⬇️

Here are some functions in these files that still need a tune-up:

File	Function	Quality	Recommendation
agnpy/targets.py	SSDisk.__init__	4.9	Split out functionality
agnpy/targets.py	SSDisk.u	6.85	Split out functionality
agnpy/targets.py	SSDisk.sed_flux	7.0	Split out functionality

Please see our documentation here for details on how these metrics are calculated.

We are actively working on this report - lots more documentation and extra metrics to come!

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[codecov[bot]]

Codecov Report

Merging #34 into master will increase coverage by 4.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #34      +/-   ##
==========================================
+ Coverage   78.23%   82.25%   +4.01%     
==========================================
  Files          12       12              
  Lines        1190     1279      +89     
==========================================
+ Hits          931     1052     +121     
+ Misses        259      227      -32     

Flag	Coverage Δ
#unittests	82.25% <100.00%> (+4.01%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
agnpy/targets.py	77.38% <100.00%> (+19.04%)	:arrow_up:
agnpy/tests/test_targets.py	100.00% <100.00%> (ø)
agnpy/tests/test_spectra_emission_regions.py	100.00% <0.00%> (ø)
agnpy/spectra.py	69.07% <0.00%> (+1.94%)	:arrow_up:
agnpy/emission_regions.py	84.61% <0.00%> (+2.00%)	:arrow_up:

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