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package forward
import (
"testing"
"github.com/coredns/coredns/plugin/pkg/dnstest"
"github.com/miekg/dns"
)
func TestPersistent(t *testing.T) {
s := dnstest.NewServer(func(w dns.ResponseWriter, r *dns.Msg) {
ret := new(dns.Msg)
ret.SetReply(r)
w.WriteMsg(ret)
})
defer s.Close()
tr := newTransport(s.Addr, nil /* no TLS */)
defer tr.Stop()
c1, cache1, _ := tr.Dial("udp")
c2, cache2, _ := tr.Dial("udp")
c3, cache3, _ := tr.Dial("udp")
if cache1 || cache2 || cache3 {
t.Errorf("Expected non-cached connection")
}
tr.Yield(c1)
tr.Yield(c2)
tr.Yield(c3)
if x := tr.Len(); x != 3 {
t.Errorf("Expected cache size to be 3, got %d", x)
}
c4, cache4, _ := tr.Dial("udp")
if x := tr.Len(); x != 2 {
t.Errorf("Expected cache size to be 2, got %d", x)
}
c5, cache5, _ := tr.Dial("udp")
if x := tr.Len(); x != 1 {
t.Errorf("Expected cache size to be 1, got %d", x)
}
if cache4 == false || cache5 == false {
t.Errorf("Expected cached connection")
}
tr.Yield(c4)
tr.Yield(c5)
if x := tr.Len(); x != 3 {
t.Errorf("Expected cache size to be 3, got %d", x)
}
}
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