forked from Snider/Poindexter
50 lines
1.2 KiB
Go
50 lines
1.2 KiB
Go
package main
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import (
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poindexter "github.com/Snider/Poindexter"
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"testing"
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)
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type peer3test struct {
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ID string
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PingMS float64
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Hops float64
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GeoKM float64
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}
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func TestExample3D(t *testing.T) {
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peers := []peer3test{
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{ID: "A", PingMS: 22, Hops: 3, GeoKM: 1200},
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{ID: "B", PingMS: 34, Hops: 2, GeoKM: 800},
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{ID: "C", PingMS: 15, Hops: 4, GeoKM: 4500},
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{ID: "D", PingMS: 55, Hops: 1, GeoKM: 300},
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{ID: "E", PingMS: 18, Hops: 2, GeoKM: 2200},
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}
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weights := [3]float64{1.0, 0.7, 0.3}
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invert := [3]bool{false, false, false}
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pts, err := poindexter.Build3D(
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peers,
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func(p peer3test) string { return p.ID },
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func(p peer3test) float64 { return p.PingMS },
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func(p peer3test) float64 { return p.Hops },
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func(p peer3test) float64 { return p.GeoKM },
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weights, invert,
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)
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if err != nil {
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t.Fatalf("Build3D err: %v", err)
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}
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tr, err := poindexter.NewKDTree(pts, poindexter.WithMetric(poindexter.EuclideanDistance{}))
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if err != nil {
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t.Fatalf("NewKDTree err: %v", err)
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}
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best, d, ok := tr.Nearest([]float64{0, weights[1] * 0.2, weights[2] * 0.4})
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if !ok {
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t.Fatalf("no nearest")
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}
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if best.ID == "" {
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t.Fatalf("unexpected empty ID")
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}
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if d < 0 {
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t.Fatalf("negative distance: %v", d)
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}
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}
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