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package leadership
import (
"testing"
"github.com/docker/libkv/store"
libkvmock "github.com/docker/libkv/store/mock"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/mock"
)
func TestFollower(t *testing.T) {
kv, err := libkvmock.New([]string{}, nil)
assert.NoError(t, err)
assert.NotNil(t, kv)
mockStore := kv.(*libkvmock.Mock)
kvCh := make(chan *store.KVPair)
var mockKVCh <-chan *store.KVPair = kvCh
mockStore.On("Watch", "test_key", mock.Anything).Return(mockKVCh, nil)
follower := NewFollower(kv, "test_key")
leaderCh, errCh := follower.FollowElection()
// Simulate leader updates
go func() {
kvCh <- &store.KVPair{Key: "test_key", Value: []byte("leader1")}
kvCh <- &store.KVPair{Key: "test_key", Value: []byte("leader1")}
kvCh <- &store.KVPair{Key: "test_key", Value: []byte("leader2")}
kvCh <- &store.KVPair{Key: "test_key", Value: []byte("leader1")}
}()
// We shouldn't see duplicate events.
assert.Equal(t, <-leaderCh, "leader1")
assert.Equal(t, <-leaderCh, "leader2")
assert.Equal(t, <-leaderCh, "leader1")
assert.Equal(t, follower.Leader(), "leader1")
// Once stopped, iteration over the leader channel should stop.
follower.Stop()
close(kvCh)
// Assert that we receive an error from the error chan to deal with the failover
err, open := <-errCh
assert.True(t, open)
assert.NotNil(t, err)
// Ensure that the chan is closed
_, open = <-leaderCh
assert.False(t, open)
mockStore.AssertExpectations(t)
}
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