Refactor to make mapping url explicit and eliminate LookupLoader #703
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Description
Previously, tests could fail because some tests would change the global state of the mapping URL. I changed this to an explicit argument so that we could eliminate the global state and the
_LookupLoader
class.I also made
mapping_url
a required variable (no default). I did this mainly to ensure that all the wires are connected. This could be mildly annoying since it has an obvious default value. We can address this in a future PR, but for now I think explicit is better.