[8.0] [stock_picking_policy] Adding unittest

[mikevhe18]

No description provided.

[coveralls]

Coverage increased (+10.3%) to 45.995% when pulling dda71ae on mikevhe18:8.0-stock_picking_policy_rev into 31fce70 on open-synergy:8.0.

[codecov-io]

Codecov Report

Merging #21 into 8.0 will increase coverage by 10.32%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##              8.0      #21       +/-   ##
===========================================
+ Coverage   35.66%   45.99%   +10.32%     
===========================================
  Files          19       19               
  Lines         471      437       -34     
===========================================
+ Hits          168      201       +33     
+ Misses        303      236       -67

Impacted Files	Coverage Δ
stock_picking_policy/models/stock_picking.py	100% <100%> (+79.76%)	⬆️

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