106 lines
3.3 KiB
Go
106 lines
3.3 KiB
Go
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package jupiter
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import (
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"encoding/json"
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"math"
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"os"
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"testing"
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"time"
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)
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const galileanShadowToleranceArcsec = 0.2
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type galileanPhenomenaSample struct {
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UTC string `json:"utc"`
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Phenomena map[string]galileanPhenomenonExpectation `json:"phenomena"`
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}
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type galileanPhenomenonExpectation struct {
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Transit bool `json:"transit"`
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Occultation bool `json:"occultation"`
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Eclipse bool `json:"eclipse"`
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ShadowTransit bool `json:"shadow_transit"`
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ShadowXArcsec *float64 `json:"shadow_x_arcsec,omitempty"`
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ShadowYArcsec *float64 `json:"shadow_y_arcsec,omitempty"`
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}
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func TestGalileanPhenomenaAgainstHorizonsBaseline(t *testing.T) {
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samples := loadGalileanPhenomenaBaseline(t)
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maxShadowX := 0.0
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maxShadowY := 0.0
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for _, sample := range samples {
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date, err := time.Parse(time.RFC3339, sample.UTC)
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if err != nil {
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t.Fatalf("parse %s: %v", sample.UTC, err)
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}
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got := SatellitePhenomena(date)
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for name, want := range sample.Phenomena {
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phenomenon := selectGalileanPhenomenon(got, name)
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if phenomenon.Transit != want.Transit {
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t.Fatalf("%s transit mismatch at %s: got %v want %v", name, sample.UTC, phenomenon.Transit, want.Transit)
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}
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if phenomenon.Occultation != want.Occultation {
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t.Fatalf("%s occultation mismatch at %s: got %v want %v", name, sample.UTC, phenomenon.Occultation, want.Occultation)
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}
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if phenomenon.Eclipse != want.Eclipse {
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t.Fatalf("%s eclipse mismatch at %s: got %v want %v", name, sample.UTC, phenomenon.Eclipse, want.Eclipse)
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}
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if phenomenon.ShadowTransit != want.ShadowTransit {
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t.Fatalf("%s shadow-transit mismatch at %s: got %v want %v", name, sample.UTC, phenomenon.ShadowTransit, want.ShadowTransit)
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}
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if !want.ShadowTransit {
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continue
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}
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if want.ShadowXArcsec == nil || want.ShadowYArcsec == nil {
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t.Fatalf("%s shadow baseline incomplete at %s", name, sample.UTC)
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}
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xDiff := math.Abs(phenomenon.ShadowOffsetXArcsec - *want.ShadowXArcsec)
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yDiff := math.Abs(phenomenon.ShadowOffsetYArcsec - *want.ShadowYArcsec)
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if xDiff > maxShadowX {
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maxShadowX = xDiff
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}
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if yDiff > maxShadowY {
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maxShadowY = yDiff
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}
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if xDiff > galileanShadowToleranceArcsec {
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t.Fatalf("%s shadow X mismatch at %s: got %.6f want %.6f", name, sample.UTC, phenomenon.ShadowOffsetXArcsec, *want.ShadowXArcsec)
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}
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if yDiff > galileanShadowToleranceArcsec {
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t.Fatalf("%s shadow Y mismatch at %s: got %.6f want %.6f", name, sample.UTC, phenomenon.ShadowOffsetYArcsec, *want.ShadowYArcsec)
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}
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}
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}
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t.Logf("galilean phenomena shadow max diff: X=%.3f arcsec Y=%.3f arcsec", maxShadowX, maxShadowY)
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}
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func loadGalileanPhenomenaBaseline(t *testing.T) []galileanPhenomenaSample {
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t.Helper()
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data, err := os.ReadFile("testdata/galilean_phenomena_horizons.json")
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if err != nil {
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t.Fatal(err)
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}
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var samples []galileanPhenomenaSample
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if err := json.Unmarshal(data, &samples); err != nil {
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t.Fatal(err)
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}
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if len(samples) == 0 {
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t.Fatal("empty phenomena baseline")
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}
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return samples
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}
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func selectGalileanPhenomenon(info GalileanPhenomenaInfo, name string) GalileanSatellitePhenomenon {
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switch name {
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case "io":
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return info.Io
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case "europa":
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return info.Europa
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case "ganymede":
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return info.Ganymede
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case "callisto":
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return info.Callisto
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default:
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panic("unknown satellite: " + name)
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}
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}
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