87 lines
3.2 KiB
Go
87 lines
3.2 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 TestStarOccultationDiagramUsesSolvedLocalContacts(t *testing.T) {
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location := time.FixedZone("CST", 8*3600)
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star := StarCoordinate{
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ID: "HR 4799",
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RA: 189.1975,
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Dec: -5.831944444444,
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Epoch: time.Date(2000, 1, 1, 12, 0, 0, 0, time.UTC),
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Frame: CoordinateFrameJ2000,
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ProperMotionRACosDecMasPerYear: -28,
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ProperMotionDecMasPerYear: -18,
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}
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events, err := FindStarOccultations(
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time.Date(2025, 6, 5, 0, 0, 0, 0, location),
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time.Date(2025, 6, 6, 0, 0, 0, 0, location),
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star, 121.56601, 6.80706, 0, OccultationSearchOptions{},
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)
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if err != nil {
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t.Fatalf("FindStarOccultations() error = %v", err)
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}
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if len(events) != 1 {
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t.Fatalf("FindStarOccultations() returned %d events, want 1", len(events))
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}
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diagram := StarOccultationDiagram(events[0], star, StarOccultationDiagramOptions{StepDays: 2.0 / 1440})
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if len(diagram.Frames) < 3 {
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t.Fatalf("StarOccultationDiagram() frame count = %d, want at least 3", len(diagram.Frames))
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}
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if !starOccultationDiagramFrameHasLabel(diagram.Frames[0], "Immersion") {
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t.Fatalf("first frame labels = %v, want Immersion", diagram.Frames[0].Labels)
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}
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last := diagram.Frames[len(diagram.Frames)-1]
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if !starOccultationDiagramFrameHasLabel(last, "Emersion") {
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t.Fatalf("last frame labels = %v, want Emersion", last.Labels)
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}
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if residual := math.Abs(diagram.Frames[0].SeparationArcsec - diagram.Frames[0].MoonRadiusArcsec); residual > 0.1 {
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t.Fatalf("immersion limb residual = %.6f arcsec, want <= 0.1", residual)
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}
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if residual := math.Abs(last.SeparationArcsec - last.MoonRadiusArcsec); residual > 0.1 {
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t.Fatalf("emersion limb residual = %.6f arcsec, want <= 0.1", residual)
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}
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greatest, ok := starOccultationDiagramFrameByLabel(diagram.Frames, "Greatest")
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if !ok {
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t.Fatalf("diagram does not contain Greatest frame")
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}
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if !greatest.BehindMoon || greatest.SeparationArcsec >= greatest.MoonRadiusArcsec {
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t.Fatalf("greatest frame is not behind Moon: separation=%.6f radius=%.6f", greatest.SeparationArcsec, greatest.MoonRadiusArcsec)
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}
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wrongStar := star
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wrongStar.RA += 30
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if frames := StarOccultationDiagram(events[0], wrongStar, StarOccultationDiagramOptions{}).Frames; len(frames) != 0 {
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t.Fatalf("same-ID wrong coordinate produced %d frames, want none", len(frames))
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}
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infoWithoutID := events[0]
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infoWithoutID.TargetID = ""
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wrongStar.ID = ""
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if frames := StarOccultationDiagram(infoWithoutID, wrongStar, StarOccultationDiagramOptions{}).Frames; len(frames) != 0 {
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t.Fatalf("empty-ID wrong coordinate produced %d frames, want none", len(frames))
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}
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}
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func starOccultationDiagramFrameHasLabel(frame StarOccultationDiagramFrame, label string) bool {
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for _, current := range frame.Labels {
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if current == label {
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return true
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}
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}
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return false
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}
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func starOccultationDiagramFrameByLabel(frames []StarOccultationDiagramFrame, label string) (StarOccultationDiagramFrame, bool) {
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for _, frame := range frames {
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if starOccultationDiagramFrameHasLabel(frame, label) {
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return frame, true
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}
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}
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return StarOccultationDiagramFrame{}, false
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}
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