Unit testing hms_core.data_storage.py

The bulk of the testing for the DatastoreConfig class follows testing patterns that've been established earlier. The noteworthy exception is in testing its from_config class method, which requires actual config files to be written to test against. Testing all of the good values by creating a config file full of them doesn't look that much different from other test methods that involve creating an object instance from a dict value, though – the same sort of iteration over all the good test values starts it off:

# - Test all permutations of "good" argument-values: config_file = '/tmp/datastore-test.json' for database in good_databases: for host in good_hosts: for password in good_passwords: for port in ...

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