Add unit tests for all supported protocols (6 missing)

[paul-pearce]

The following protocols are advertised as supported, but have no unit tests:

• AXFR
• CNAME
• DMARC
• TXT
• SOA
• SPF

We should also probably build out the framework so it tests iterative and non iterative queries without having to define the functions twice, once with --iterative

[paul-pearce]

I don't have control over the zdns test domain so I can't actually correct this issue. I'm willing to split the work with someone who does. (Note: Just giving me control over the test domain is probably not the right way to get me to do this. :P)

[dadrian]

What subdomains do you want?

[zakird]

I've created some new records:

old school SPF: "v=spf1 ?all" new style SPF: "v=spf1 mx include:_spf.google.com -all" _dmarc: "v=DMARC1; p=none; rua=mailto:postmaster@censys.io" TXT: "test_txt.zdns-testing.com" -> "Hello World!"

[zakird]

SOA: ns-cloud-e1.googledomains.com. dns-admin.google.com. 0 21600 3600 1209600 300

[zakird]

• [ ] AXFR
• [x] CNAME
• [x] DMARC
• [x] TXT
• [ ] SOA
• [x] SPF