func TestSelectLeastExpected(t *testing.T) {
	strategy := &LeastLoadStrategy{
		settings: &StrategyLeastLoadConfig{
			Baselines: nil,
			Expected:  3,
		},
	}
	nodes := []*node{
		{Tag: "a", RTTDeviationCost: 100},
		{Tag: "b", RTTDeviationCost: 200},
		{Tag: "c", RTTDeviationCost: 300},
		{Tag: "d", RTTDeviationCost: 350},
	}
	expected := 3
	ns := strategy.selectLeastLoad(nodes)
	if len(ns) != expected {
		t.Errorf("expected: %v, actual: %v", expected, len(ns))
	}
}
/*
Split into multiple package, need to be tested separately

func TestSelectLeastLoad(t *testing.T) {
settings := &StrategyLeastLoadConfig{
HealthCheck: &HealthPingConfig{
SamplingCount: 10,
},
Expected: 1,
MaxRTT:   int64(time.Millisecond * time.Duration(800)),
}
strategy := NewLeastLoadStrategy(settings)
std 40
strategy.PutResult("a", time.Millisecond*time.Duration(60))
strategy.PutResult("a", time.Millisecond*time.Duration(140))
strategy.PutResult("a", time.Millisecond*time.Duration(60))
strategy.PutResult("a", time.Millisecond*time.Duration(140))
std 60
strategy.PutResult("b", time.Millisecond*time.Duration(40))
strategy.PutResult("b", time.Millisecond*time.Duration(160))
strategy.PutResult("b", time.Millisecond*time.Duration(40))
strategy.PutResult("b", time.Millisecond*time.Duration(160))
std 0, but >MaxRTT
strategy.PutResult("c", time.Millisecond*time.Duration(1000))
strategy.PutResult("c", time.Millisecond*time.Duration(1000))
strategy.PutResult("c", time.Millisecond*time.Duration(1000))
strategy.PutResult("c", time.Millisecond*time.Duration(1000))
expected := "a"
actual := strategy.SelectAndPick([]string{"a", "b", "c", "untested"})
if actual != expected {
t.Errorf("expected: %v, actual: %v", expected, actual)
}
}

func TestSelectLeastLoadWithCost(t *testing.T) {
settings := &StrategyLeastLoadConfig{
HealthCheck: &HealthPingConfig{
SamplingCount: 10,
},
Costs: []*StrategyWeight{
{Match: "a", Value: 9},
},
Expected: 1,
}
strategy := NewLeastLoadStrategy(settings, nil)
std 40, std+c 120
strategy.PutResult("a", time.Millisecond*time.Duration(60))
strategy.PutResult("a", time.Millisecond*time.Duration(140))
strategy.PutResult("a", time.Millisecond*time.Duration(60))
strategy.PutResult("a", time.Millisecond*time.Duration(140))
std 60
strategy.PutResult("b", time.Millisecond*time.Duration(40))
strategy.PutResult("b", time.Millisecond*time.Duration(160))
strategy.PutResult("b", time.Millisecond*time.Duration(40))
strategy.PutResult("b", time.Millisecond*time.Duration(160))
expected := "b"
actual := strategy.SelectAndPick([]string{"a", "b", "untested"})
if actual != expected {
t.Errorf("expected: %v, actual: %v", expected, actual)
}
}
package router
import (
	"testing"
)