48 lines
1.7 KiB
Go
48 lines
1.7 KiB
Go
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package occultationgeo
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import (
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"testing"
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"time"
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"b612.me/astro/basic"
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)
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func TestDensifyRiseSetCurvesUsesProjectedSpacingAndPreservesEndpoints(t *testing.T) {
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zone := time.FixedZone("UTC+8", 8*60*60)
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firstTime := time.Date(2025, time.July, 29, 0, 0, 0, 0, zone)
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lastTime := firstTime.Add(10 * time.Minute)
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curves := []basic.OccultationRiseSetCurve{{
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Phase: basic.RiseSetPhaseStart,
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Direction: basic.RiseSetDirectionRise,
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Segments: [][]basic.OccultationPathPoint{{
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{Time: firstTime, Longitude: -130, Latitude: -70},
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{Time: lastTime, Longitude: -128, Latitude: -78},
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}},
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}}
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dense := DensifyRiseSetCurves(curves, 35)
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if len(dense) != 1 || len(dense[0].Segments) != 1 {
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t.Fatalf("curve topology changed: %#v", dense)
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}
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segment := dense[0].Segments[0]
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if len(segment) <= 2 {
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t.Fatalf("points=%d, want projected densification", len(segment))
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}
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if segment[0] != curves[0].Segments[0][0] || segment[len(segment)-1] != curves[0].Segments[0][1] {
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t.Fatalf("endpoints changed: first=%+v last=%+v", segment[0], segment[len(segment)-1])
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}
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for index := 1; index < len(segment); index++ {
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if spacing := projectedGeoPointDistanceKM(segment[index-1], segment[index]); spacing > 35.000001 {
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t.Fatalf("edge %d projected spacing=%.3f km, want <=35 km", index, spacing)
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}
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}
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}
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func TestDensifyRiseSetCurvesDoesNotMutateInput(t *testing.T) {
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point := basic.OccultationPathPoint{Time: time.Unix(0, 0), Longitude: 1, Latitude: 2}
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curves := []basic.OccultationRiseSetCurve{{Segments: [][]basic.OccultationPathPoint{{point, point}}}}
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_ = DensifyRiseSetCurves(curves, 35)
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if len(curves) != 1 || len(curves[0].Segments) != 1 || len(curves[0].Segments[0]) != 2 {
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t.Fatalf("input mutated: %#v", curves)
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}
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}
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