74 lines
2.0 KiB
Go
74 lines
2.0 KiB
Go
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package eclipse
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import (
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"testing"
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"time"
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"b612.me/astro/basic"
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)
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func TestEclipseSearchStepDoesNotSkipPotentialCandidates(t *testing.T) {
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testCases := []struct {
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name string
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phaseType int
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synodicMonthDays float64
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potential func(float64) bool
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}{
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{
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name: "solar",
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phaseType: 0,
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synodicMonthDays: solarEclipseSynodicMonthDays,
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potential: isPotentialSolarEclipse,
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},
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{
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name: "lunar",
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phaseType: 1,
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synodicMonthDays: lunarEclipseSynodicMonthDays,
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potential: isPotentialLunarEclipse,
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},
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}
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for _, tc := range testCases {
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t.Run(tc.name, func(t *testing.T) {
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candidates := eclipseSearchTestCandidates(1600, 800, tc.phaseType, tc.synodicMonthDays)
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for index, candidateTT := range candidates {
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for _, direction := range []int{-1, 1} {
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step := eclipseSearchStep(candidateTT, direction, tc.synodicMonthDays)
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for offset := 1; offset < step; offset++ {
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skippedIndex := index + direction*offset
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if skippedIndex < 0 || skippedIndex >= len(candidates) {
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continue
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}
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if tc.potential(candidates[skippedIndex]) {
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t.Fatalf(
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"%s skip crosses potential candidate: index=%d direction=%d step=%d offset=%d jd=%.8f",
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tc.name,
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index,
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direction,
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step,
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offset,
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candidates[skippedIndex],
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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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}
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}
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func eclipseSearchTestCandidates(startYear, years, phaseType int, synodicMonthDays float64) []float64 {
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startTT := basic.Date2JDE(time.Date(startYear, 1, 1, 0, 0, 0, 0, time.UTC))
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endTT := basic.Date2JDE(time.Date(startYear+years, 1, 1, 0, 0, 0, 0, time.UTC))
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candidateTT := basic.CalcMoonSHByJDE(startTT, phaseType)
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candidates := make([]float64, 0, years*13)
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for candidateTT < endTT {
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if candidateTT >= startTT {
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candidates = append(candidates, candidateTT)
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}
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candidateTT = basic.CalcMoonSHByJDE(candidateTT+synodicMonthDays, phaseType)
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}
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return candidates
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}
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