62 lines
2.1 KiB
Go
62 lines
2.1 KiB
Go
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package geojson_test
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import (
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"reflect"
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"testing"
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"time"
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"b612.me/astro/eclipse"
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"b612.me/astro/geojson"
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)
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func TestSolarTotalBandIndependentOfMagnitudeLines(t *testing.T) {
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for _, fixture := range []struct {
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date time.Time
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lon, lat float64
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}{
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{time.Date(2026, 8, 12, 0, 0, 0, 0, time.UTC), -5.991755201, 45.070085755},
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{time.Date(2024, 4, 8, 0, 0, 0, 0, time.UTC), -32.007627414, 49.493804579},
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} {
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t.Run(fixture.date.Format("2006-01-02"), func(t *testing.T) {
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central, ok := eclipse.SolarEclipseCentralPath(fixture.date, eclipse.SolarEclipsePathOptions{Step: time.Minute})
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if !ok {
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t.Fatal("missing central path")
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}
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local, ok := eclipse.GeometricLocalSolarEclipseOnDate(fixture.date, fixture.lon, fixture.lat, 0)
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if !ok || local.Type != eclipse.SolarEclipseTotal || !local.VisibleAtGreatest {
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t.Fatal("invalid totality witness")
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}
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var reference [][]eclipse.SolarEclipsePathPoint
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for _, magnitudes := range [][]float64{nil, {1}} {
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partial, ok := eclipse.SolarEclipsePartialFootprints(fixture.date, eclipse.SolarEclipsePartialFootprintOptions{
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Step: 2 * time.Minute, BoundaryPoints: 96, MagnitudeValues: magnitudes,
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})
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if !ok || len(partial.CentralBandSegments) == 0 {
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t.Fatal("missing authoritative totality band")
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}
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if reference == nil {
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reference = partial.CentralBandSegments
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} else if !reflect.DeepEqual(reference, partial.CentralBandSegments) {
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t.Fatal("magnitude display option changes totality geometry")
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}
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if len(magnitudes) == 0 && len(partial.MagnitudeContours) != 0 {
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t.Fatal("unrequested magnitude lines")
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}
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for _, ring := range partial.CentralBandSegments {
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assertSolarPathMaximumEdgeKM(t, ring, 250)
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}
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for _, path := range []*eclipse.SolarEclipsePath{¢ral, nil} {
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data, err := geojson.MarshalSolarEclipse(partial, path)
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if err != nil {
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t.Fatal(err)
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}
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band := featureWithRole(t, decodeCollection(t, data), "central-band")
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if !geometryContainsPoint(t, band.Geometry, fixture.lon, fixture.lat) {
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t.Fatal("totality band omits visible site")
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}
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}
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}
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})
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}
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}
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