micro/selector/roundrobin/roundrobin_test.go

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package roundrobin
import (
"testing"
"github.com/stretchr/testify/assert"
"github.com/unistack-org/micro/v3/selector"
)
func TestRoundRobin(t *testing.T) {
selector.Tests(t, NewSelector())
r1 := "127.0.0.1:8000"
r2 := "127.0.0.1:8001"
r3 := "127.0.0.1:8002"
sel := NewSelector()
// By passing r1 and r2 first, it forces a set sequence of (r1 => r2 => r3 => r1)
next, err := sel.Select([]string{r1})
r := next()
assert.Nil(t, err, "Error should be nil")
assert.Equal(t, r1, r, "Expected route to be r1")
next, err = sel.Select([]string{r2})
r = next()
assert.Nil(t, err, "Error should be nil")
assert.Equal(t, r2, r, "Expected route to be r2")
// Because r1 and r2 have been recently called, r3 should be chosen
next, err = sel.Select([]string{r1, r2, r3})
n1, n2, n3 := next(), next(), next()
assert.Nil(t, err, "Error should be nil")
assert.Equal(t, r1, n1, "Expected route to be r3")
assert.Equal(t, r2, n2, "Expected route to be r3")
assert.Equal(t, r3, n3, "Expected route to be r3")
}