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Changed the test test_get_fqdn_by_host_on_bad_host to check the exception thrown by socket.gethostbyname_ex using a regex to account for variations in error message returned in different environments.
Also changed the test to use a context manager to test whether an exception is raised. This should prevent the test from incorrectly passing if no exception is thrown.
These changes close #3916.
Requirements check-list
CONTRIBUTING.md
and added my name as a Code Contributor.