Also cover the case that there is no IPv4 address on an IPv6 only host.
Included are rspec tests for the sshkey resource
Test for correct host_aliases for the host's own sshkey resource.
3 possible combinations of IPv4 and IPv6 address are tested.
Not tested are:
- Virtual sshkey resources from other hosts.
- Other parameters for the sshkey resource (type, key)
- Non-default values for ssh_key_ensure and ssh_key_import.
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