dbmigrators settings are usually set when running the command line
interface, but since the utils tests don't use the command line
interface, dbmigrator.utils.set_settings need to be called explicitly
so for example, db connection string is set up.
Coverage increased (+0.002%) to 97.635% when pulling 52c82e2ef09b0633d00d4be71e59e60d23e92565 on fix-tests into 1becb2b5ee92365b0884e59abdc5350e8bfb0c71 on master.
dbmigrators settings are usually set when running the command line interface, but since the utils tests don't use the command line interface,
dbmigrator.utils.set_settings
need to be called explicitly so for example, db connection string is set up.