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Tests for L{twisted.names.tap}.
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Tests for L{Options}, defining how command line arguments for the DNS server
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If the value supplied for an I{--secondary} option does not provide a
server IP address, optional port number, and domain name,
L{Options.parseOptions} raises L{UsageError}.
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An argument of the form C{"ip/domain"} is parsed by L{Options} for the
I{--secondary} option and added to its list of secondaries, using the
default DNS port number.
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An argument of the form C{"ip:port/domain"} can be used to specify an
alternate port number for which to act as a secondary.
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After parsing I{--secondary} options, L{Options} constructs a
L{SecondaryAuthorityService} instance for each configured secondary.
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Recursive DNS lookups, if enabled, should be a last-resort option.
Any other lookup method (cache, local lookup, etc.) should take
precedence over recursive lookups
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