Testing encoding and exports of units and IfcReal values

[jwouellette]

Problem
In implementation development and testing, there is a need to test the creation, conversion, and export of various complex unit types, typically things like gal/s, m/s, psi, MPA, etc., especially making sure native display and IFC output match.

Solution(s)
Unit test(s) that cover various unit types that need to be supported for various objects

Require schema changes?
no

Require documentation changes?
don't know, but might be helpful

Rule required
don't know

Additional context
n/a