Added test for fulfillment model

[ht-albert]

No description provided.

[codecov-io]

Codecov Report

Merging #13 into master will increase coverage by 11.87%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master      #13       +/-   ##
===========================================
+ Coverage   69.83%   81.71%   +11.88%     
===========================================
  Files          26       23        -3     
  Lines         494      454       -40     
===========================================
+ Hits          345      371       +26     
+ Misses        149       83       -66

Impacted Files	Coverage Δ
connect/__init__.py
tests/test_config.py
setup.py
connect/models/marketplace.py	98.07% <0%> (+3.84%)	⬆️
connect/models/parameters.py	94.73% <0%> (+5.26%)	⬆️
connect/models/asset.py	100% <0%> (+5.26%)	⬆️
connect/models/fulfillment.py	100% <0%> (+5.26%)	⬆️
connect/models/connection.py	100% <0%> (+6.66%)	⬆️
connect/models/tiers.py	100% <0%> (+6.66%)	⬆️
connect/models/product.py	100% <0%> (+11.76%)	⬆️
... and 6 more

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[vgrebenschikov]

Fine