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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
package appc
import (
"errors"
"net/netip"
"testing"
"go4.org/netipx"
"tailscale.com/util/must"
)
func TestNext(t *testing.T) {
a := ippool{}
_, err := a.next()
if !errors.Is(err, errPoolExhausted) {
t.Fatalf("expected errPoolExhausted, got %v", err)
}
var isb netipx.IPSetBuilder
ipset := must.Get(isb.IPSet())
b := newIPPool(ipset)
_, err = b.next()
if !errors.Is(err, errPoolExhausted) {
t.Fatalf("expected errPoolExhausted, got %v", err)
}
isb.AddRange(netipx.IPRangeFrom(netip.MustParseAddr("192.168.0.0"), netip.MustParseAddr("192.168.0.2")))
isb.AddRange(netipx.IPRangeFrom(netip.MustParseAddr("200.0.0.0"), netip.MustParseAddr("200.0.0.0")))
isb.AddRange(netipx.IPRangeFrom(netip.MustParseAddr("201.0.0.0"), netip.MustParseAddr("201.0.0.1")))
ipset = must.Get(isb.IPSet())
c := newIPPool(ipset)
expected := []string{
"192.168.0.0",
"192.168.0.1",
"192.168.0.2",
"200.0.0.0",
"201.0.0.0",
"201.0.0.1",
}
for i, want := range expected {
addr, err := c.next()
if err != nil {
t.Fatal(err)
}
if addr != netip.MustParseAddr(want) {
t.Fatalf("next call %d want: %s, got: %v", i, want, addr)
}
}
_, err = c.next()
if !errors.Is(err, errPoolExhausted) {
t.Fatalf("expected errPoolExhausted, got %v", err)
}
_, err = c.next()
if !errors.Is(err, errPoolExhausted) {
t.Fatalf("expected errPoolExhausted, got %v", err)
}
}
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