88 lines
3.4 KiB
Go
88 lines
3.4 KiB
Go
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package basic
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import (
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"math"
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"testing"
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"time"
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)
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func TestOccultationStationCacheRecyclingPreservesContactModel(t *testing.T) {
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context := newOccultationRiseSetContext(2451545, 10, 5, 384000, 10.5, 5.25, 1e9, 60000)
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uncached := context
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uncached.states = nil
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for pass := 0; pass < 2; pass++ {
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for index := 0; index < 4*occultationRiseSetStateCacheMaximumEntries; index++ {
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lon, lat := float64(index*7-110), float64(index-40)
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for _, total := range []bool{false, true} {
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actual, reference := context, uncached
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if total {
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actual, reference = actual.withInternalContact(), reference.withInternalContact()
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}
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if got, want := actual.stateAt(lon, lat), reference.stateAt(lon, lat); got != want {
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t.Fatalf("cached station differs: got=%+v want=%+v", got, want)
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}
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}
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if len(context.states) > occultationRiseSetStateCacheMaximumEntries {
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t.Fatal("station cache exceeded bound")
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}
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}
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}
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}
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func TestOccultationEnvelopePredictionRequiresExactCorrection(t *testing.T) {
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start := time.Date(2025, 1, 4, 0, 0, 0, 0, time.UTC)
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events, err := FindBestPlanetOccultations(start, start.Add(48*time.Hour), OccultationSaturn, OccultationSearchOptions{})
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if err != nil || len(events) != 1 {
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t.Fatalf("events=%d err=%v", len(events), err)
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}
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tt := occultationTimeToTT(events[0].Greatest)
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config, _ := planetOccultationConfigFor(OccultationSaturn)
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event := newPlanetOccultationEventCache(config)
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event.prepareLocalEphemeris(tt)
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north, _, width, ok := occultationPathLimitsAndWidthForFrame(tt, event.outerFrameAt)
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if !ok {
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t.Fatal("missing limit seed")
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}
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seed := occultationPathPointFromVector(tt, north, width, time.UTC)
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sample, ok := occultationStationCorrectEnvelopePoint(tt, seed, event.riseSetContextAt, false, time.UTC)
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if !ok {
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t.Fatal("missing exact envelope seed")
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}
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model := occultationStationEnvelopeModel{kind: occultationStationContactEnvelope}
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exact := newOccultationRiseSetEvaluationCache(event.riseSetContextAt)
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state, ok := occultationStationEnvelopeArcStateAt(sample.point, tt, exact, model)
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if !ok {
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t.Fatal("missing envelope tangent")
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}
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predictor := state.coordinates
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for index := range predictor {
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predictor[index] += 0.2 * state.tangent[index]
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}
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want, _, ok := occultationStationCorrectEnvelopeArc(predictor, state.tangent, tt, exact, model, width, time.UTC)
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if !ok {
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t.Fatal("exact correction failed")
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}
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for _, invalid := range []bool{false, true} {
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candidateCalls := 0
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cache := newOccultationRiseSetEvaluationCacheWithCandidate(event.riseSetContextAt, func(at float64) occultationRiseSetContext {
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candidateCalls++
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if invalid {
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return occultationRiseSetContext{}
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}
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return event.candidateRiseSetContextAt(at)
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})
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got, _, ok := occultationStationCorrectEnvelopeArc(predictor, state.tangent, tt, cache, model, width, time.UTC)
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if !ok || candidateCalls == 0 {
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t.Fatalf("candidate correction ok=%v calls=%d invalid=%v", ok, candidateCalls, invalid)
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}
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if distance := occultationPathDistanceKM(want.point, got.point); distance > 0.005 {
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t.Fatalf("candidate displaced exact root by %v km", distance)
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}
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evaluation := exact.evaluation(centerTimeTT(got.point.Time))
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residual, ok := model.residual(evaluation, got.point.Longitude, got.point.Latitude)
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if !ok || math.Abs(residual[0]) > model.valueTolerance() || math.Abs(residual[1]) > model.derivativeTolerance() {
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t.Fatalf("accepted inexact root %v", residual)
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}
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}
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}
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