Additional unit tests for processor module

[lionel-nj]

Is your feature request related to a problem? Please describe. At present, the new architecture is not fully tested.

Describe the solution you'd like Additional unit tests should be written.

Additional context See:

• additional unit tests for core module
• additional unit test for main module

[barbeau]

@lionel-nj I think this issue can be closed in favor of https://github.com/MobilityData/gtfs-validator/issues/734?

[lionel-nj]

@lionel-nj I think this issue can be closed in favor of #734?

Yes! Closing now.

[lionel-nj]

734 will implement higher level tests. Closing.