test: create snapshot tests to validate the output of the soil ID algorithm

[shrouxm]

Description

The soil ID algorithm is currently a big blob of complicated code and we don't have the in-house expertise to validate its output. When we do get to a point of trying to validate its output with experts, we should create snapshot tests of "valid" output so that at the very least we can be confident we aren't changing the algorithm's behavior if we make non-functional changes.