CoreDNSServer returns a CoreDNS test server.

CoreDNSServerAndPorts combines CoreDNSServer and CoreDNSServerPorts to start a CoreDNS server and returns the udp and tcp ports of the first instance.

CoreDNSServerPorts returns the ports the instance is listening on.

CoreDNSServerStop stops a server.

NewInput returns a pointer to Input, containing the corefile string as input.

TempFile will create a temporary file on disk and returns the name and a cleanup function to remove it later.

Input implements the caddy.Input interface and acts as an easy way to use a string as a Corefile.