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package gui
import (
"fmt"
"testing"
)
// Kill the killer with no victim attached.
func TestKillerKill(t *testing.T) {
killer := newKiller()
if !trySend(killer.Kill(), true, timeout) {
t.Errorf("kill timed out after %v", timeout)
}
if _, ok := tryRecv(killer.Dead(), timeout); !ok {
t.Errorf("no dead signal from killer after %v", timeout)
}
}
// Kill the killer with a victim attached.
func TestKillerAttachKill(t *testing.T) {
killer := newKiller()
victim, err := newDummyVictim(killer)
if err != nil {
t.Error(err)
}
// Kill the killer.
if !trySend(killer.Kill(), true, timeout) {
t.Errorf("failed to kill killer after %v", timeout)
}
if _, ok := tryRecv(killer.Dead(), timeout); !ok {
t.Errorf("killer not dead after %v", timeout)
}
// victim.Dead() should now be closed.
if _, notClosed := <-victim.Dead(); notClosed {
t.Errorf("victim not dead after killing killer")
}
}
// Detach the victim and attach another in its place.
func TestKillerReattach(t *testing.T) {
killer := newKiller()
// Attach first victim.
victim1, err := newDummyVictim(killer)
if err != nil {
t.Error(err)
}
// Try to attach second victim while first still attached—should fail.
if _, err := newDummyVictim(killer); err == nil {
t.Errorf("killer accepted another victim while the first was still attached.")
}
// Detach first victim.
if !trySend(victim1.Kill(), true, timeout) {
t.Errorf("failed to kill first victim after %v", timeout)
}
if _, ok := tryRecv(victim1.Dead(), timeout); !ok {
t.Errorf("first victim failed to die after %v", timeout)
}
// Attach second victim.
if _, err := newDummyVictim(killer); err != nil {
t.Error(err)
}
killer.Kill() <- true
<-killer.Dead()
}
type dummyVictim struct {
kill chan<- bool
dead <-chan bool
detachChan <-chan bool
}
// newDummyVictim returns a victim that is attached to parent,
// or error if the parent does not accept the attach.
func newDummyVictim(parent killer) (victim, error) {
kill := make(chan bool)
dead := make(chan bool)
detachChan := make(chan bool)
go func() {
<-kill
close(kill)
detachChan <- true
close(detachChan)
dead <- true
close(dead)
}()
dummy := dummyVictim{kill, dead, detachChan}
if !trySend(parent.attach(), victim(dummy), timeout) {
return dummy, fmt.Errorf("failed to attach after %v", timeout)
}
return dummy, nil
}
func (dv dummyVictim) Kill() chan<- bool {
return dv.kill
}
func (dv dummyVictim) Dead() <-chan bool {
return dv.dead
}
func (dv dummyVictim) detach() <-chan bool {
return dv.detachChan
}
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