77 lines
2.0 KiB
Go
77 lines
2.0 KiB
Go
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package geojson_test
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import (
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"sync"
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"testing"
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"time"
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"b612.me/astro/geojson"
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"b612.me/astro/moon"
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)
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type mars20250729FixtureKey struct {
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riseSetStep time.Duration
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includeTimeline bool
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}
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type mars20250729Fixture struct {
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path moon.PlanetOccultationPath
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collection decodedCollection
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}
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var mars20250729Fixtures = struct {
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sync.Mutex
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values map[mars20250729FixtureKey]*mars20250729Fixture
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}{values: make(map[mars20250729FixtureKey]*mars20250729Fixture)}
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// mars20250729TestFixture computes each distinct Mars regression scenario once.
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// The returned path and decoded collection are read-only test fixtures; caching
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// them avoids repeating the expensive ephemeris and GeoJSON setup in related
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// assertions without sharing mutable production state.
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func mars20250729TestFixture(
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t *testing.T,
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riseSetStep time.Duration,
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includeTimeline bool,
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) *mars20250729Fixture {
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t.Helper()
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key := mars20250729FixtureKey{
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riseSetStep: riseSetStep,
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includeTimeline: includeTimeline,
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}
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mars20250729Fixtures.Lock()
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defer mars20250729Fixtures.Unlock()
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if fixture := mars20250729Fixtures.values[key]; fixture != nil {
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return fixture
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}
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zone := time.FixedZone("UTC+8", 8*60*60)
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start := time.Date(2025, time.July, 29, 0, 0, 0, 0, zone)
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options := moon.OccultationPathOptions{
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Step: 20 * time.Minute,
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TargetSpacingKM: 900,
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RiseSetStep: riseSetStep,
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DisableFootprints: true,
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}
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if includeTimeline {
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options.IncludeFootprintTimeline = true
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options.FootprintTimelineStep = 5 * time.Minute
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}
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paths, err := moon.FindPlanetOccultationPaths(
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start, start.Add(24*time.Hour), moon.OccultationMars, options,
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)
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if err != nil || len(paths) != 1 {
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t.Fatalf("FindPlanetOccultationPaths() paths=%d err=%v, want one", len(paths), err)
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}
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data, err := geojson.MarshalPlanetOccultation(paths[0])
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if err != nil {
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t.Fatalf("MarshalPlanetOccultation: %v", err)
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}
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fixture := &mars20250729Fixture{
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path: paths[0],
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collection: decodeCollection(t, data),
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}
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mars20250729Fixtures.values[key] = fixture
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return fixture
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}
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