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// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package ipnserver
import (
"context"
"sync"
"testing"
)
func TestWaiterSet(t *testing.T) {
var s waiterSet
wantLen := func(want int, when string) {
t.Helper()
if got := len(s); got != want {
t.Errorf("%s: len = %v; want %v", when, got, want)
}
}
wantLen(0, "initial")
var mu sync.Mutex
ctx, cancel := context.WithCancel(context.Background())
ready, cleanup := s.add(&mu, ctx)
wantLen(1, "after add")
select {
case <-ready:
t.Fatal("should not be ready")
default:
}
s.wakeAll()
<-ready
wantLen(1, "after fire")
cleanup()
wantLen(0, "after cleanup")
// And again but on an already-expired ctx.
cancel()
ready, cleanup = s.add(&mu, ctx)
<-ready // shouldn't block
cleanup()
wantLen(0, "at end")
}
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