build / submit transaction test

[cxloe]

In this PR

Testing the build transaction and submit transaction endpoints independently.

This is derived off of basic.py and includes some changes that have been moved to other PRs.

[codecov-commenter]

Codecov Report

Base: 59.50% // Head: 59.50% // No change to project coverage 👍

Coverage data is based on head (db40fa3) compared to base (f67c69b).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #622   +/-   ##
========================================
  Coverage    59.50%   59.50%           
========================================
  Files           83       83           
  Lines        11540    11540           
  Branches      1866     1866           
========================================
  Hits          6867     6867           
  Misses        3124     3124           
  Partials      1549     1549           

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