func TestDiscover(t *testing.T) {
t.Parallel()
for _, scenario := range discoverScenarios {
t.Run(scenario.description, func(t *testing.T) {
target, port, err := dnsdisco.Discover(scenario.service, scenario.proto, scenario.name)
if target != scenario.expectedTarget {
t.Errorf("mismatch targets. Expecting: “%s”; found “%s”", scenario.expectedTarget, target)
}
if port != scenario.expectedPort {
t.Errorf("mismatch ports. Expecting: “%d”; found “%d”", scenario.expectedPort, port)
}
// As the resolver change between machines, we can't guess the DNSError name's attribute. So we
// need to inject the value on the expected error
dnsError, ok1 := err.(*net.DNSError)
expectedDNSError, ok2 := scenario.expectedError.(*net.DNSError)
if ok1 && ok2 {
expectedDNSError.Server = dnsError.Server
}
if !reflect.DeepEqual(err, scenario.expectedError) {
t.Errorf("mismatch errors. Expecting: “%v”; found “%v”", scenario.expectedError, err)
}
})
}
}
// ExampleDiscover is the fastest way to select a server using all default
// algorithms.
func ExampleDiscover() {
target, port, err := dnsdisco.Discover("jabber", "tcp", "registro.br")
if err != nil {
fmt.Println(err)
return
}
fmt.Printf("Target: %s\nPort: %d\n", target, port)
// Output:
// Target: jabber.registro.br.
// Port: 5269
}