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peer_broadcaster_test.go
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peer_broadcaster_test.go
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package graft
import (
e "github.com/benmills/examples"
"testing"
)
func TestPeerBroadcast(t *testing.T) {
e.When("voting", t,
e.It("can send successful RequestVoteMessages", func(expect e.Expectation) {
peer := &FailingPeer{numberOfFails: 0}
votes := 0
broadcast := PeerBroadcast(RequestVoteMessage{}, []Peer{peer})
func() {
for {
select {
case r := <-broadcast.Response:
votes++
r.Done()
case <-broadcast.End:
return
}
}
}()
expect(votes).To.Equal(1)
}),
e.It("can handle failures", func(expect e.Expectation) {
peer := &FailingPeer{numberOfFails: -1}
votes := 0
broadcast := PeerBroadcast(RequestVoteMessage{}, []Peer{peer})
func() {
for {
select {
case r := <-broadcast.Response:
votes++
r.Done()
case <-broadcast.End:
return
}
}
}()
expect(votes).To.Equal(0)
}),
e.It("will retry on failure", func(expect e.Expectation) {
goodPeer := &FailingPeer{numberOfFails: 0}
badPeer := &FailingPeer{numberOfFails: -1}
soSoPeer := &FailingPeer{numberOfFails: 4}
votes := 0
broadcast := PeerBroadcast(RequestVoteMessage{}, []Peer{goodPeer, badPeer, soSoPeer})
broadcast.defaultRetryCount = 5
func() {
for {
select {
case r := <-broadcast.Response:
votes++
r.Done()
case <-broadcast.End:
return
}
}
}()
expect(votes).To.Equal(2)
}),
e.It("can resend messages", func(expect e.Expectation) {
receivedMessages := 0
recordingPeer := &FailingPeer{
numberOfFails: 0,
receiveRequestVoteCallback: func() {
receivedMessages++
},
}
broadcast := PeerBroadcast(RequestVoteMessage{}, []Peer{recordingPeer})
func() {
for {
select {
case r := <-broadcast.Response:
receivedMessages++
if receivedMessages < 2 {
r.Resend()
} else {
r.Done()
}
case <-broadcast.End:
return
}
}
}()
expect(receivedMessages).To.Equal(2)
}),
)
}