99 lines
3.2 KiB
Go
99 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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)
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// 未发生阶段的接触时刻必须是 NaN：JD 0 是 −4713-11-24 的真实时刻，不能当“无此阶段”的哨兵。
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func TestLunarEclipseAbsentPhasesAreNaN(t *testing.T) {
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eclipse := LunarEclipse(2458860.0)
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if eclipse.Type != LunarEclipsePenumbral {
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t.Fatalf("type = %s, want %s", eclipse.Type, LunarEclipsePenumbral)
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}
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if !eclipse.HasPenumbral || eclipse.HasPartial || eclipse.HasTotal {
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t.Fatalf("unexpected flags: %+v", eclipse)
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}
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for name, value := range map[string]float64{
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"PartialStart": eclipse.PartialStart,
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"PartialEnd": eclipse.PartialEnd,
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"TotalStart": eclipse.TotalStart,
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"TotalEnd": eclipse.TotalEnd,
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} {
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if !math.IsNaN(value) {
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t.Fatalf("%s = %.12f, want NaN", name, value)
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}
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}
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for name, value := range map[string]float64{
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"PenumbralStart": eclipse.PenumbralStart,
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"PenumbralEnd": eclipse.PenumbralEnd,
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"Maximum": eclipse.Maximum,
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} {
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if !isFiniteFloat(value) {
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t.Fatalf("%s = %v, want a finite contact", name, value)
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}
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}
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}
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func TestLunarEclipseWithoutEclipseHasNoContacts(t *testing.T) {
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// 2025-01-13 的望月没有月食（半影食分 < 0）。
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eclipse := LunarEclipse(JDECalc(2025, 1, 13))
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if eclipse.Type != LunarEclipseNone {
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t.Fatalf("type = %s, want %s", eclipse.Type, LunarEclipseNone)
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}
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if eclipse.HasPenumbral || eclipse.HasPartial || eclipse.HasTotal {
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t.Fatalf("unexpected flags: %+v", eclipse)
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}
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for name, value := range map[string]float64{
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"PenumbralStart": eclipse.PenumbralStart,
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"PenumbralEnd": eclipse.PenumbralEnd,
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"PartialStart": eclipse.PartialStart,
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"PartialEnd": eclipse.PartialEnd,
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"TotalStart": eclipse.TotalStart,
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"TotalEnd": eclipse.TotalEnd,
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} {
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if !math.IsNaN(value) {
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t.Fatalf("%s = %.12f, want NaN", name, value)
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}
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}
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if !isFiniteFloat(eclipse.Maximum) {
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t.Fatalf("Maximum = %v, want the geometric extremum", eclipse.Maximum)
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}
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}
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func TestLunarEclipseTotalKeepsAllContactsFinite(t *testing.T) {
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eclipse := LunarEclipse(JDECalc(2025, 3, 14))
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if eclipse.Type != LunarEclipseTotal || !eclipse.HasPenumbral || !eclipse.HasPartial || !eclipse.HasTotal {
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t.Fatalf("unexpected result: %+v", eclipse)
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}
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contacts := []float64{
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eclipse.PenumbralStart, eclipse.PartialStart, eclipse.TotalStart,
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eclipse.Maximum,
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eclipse.TotalEnd, eclipse.PartialEnd, eclipse.PenumbralEnd,
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}
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for i, value := range contacts {
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if !isFiniteFloat(value) {
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t.Fatalf("contact %d = %v, want finite", i, value)
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}
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if i > 0 && value <= contacts[i-1] {
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t.Fatalf("contacts not increasing at %d: %v", i, contacts)
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}
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}
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}
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func TestLunarEclipseDiagramSkipsAbsentPhases(t *testing.T) {
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diagram := LunarEclipseDiagram(2458860.0, LunarEclipseDiagramOptions{})
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if len(diagram.Points) == 0 {
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t.Fatalf("penumbral eclipse diagram should still have path points")
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}
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for _, point := range diagram.Points {
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if !isFiniteFloat(point.JDE) || !isFiniteFloat(point.X) || !isFiniteFloat(point.Y) {
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t.Fatalf("non-finite diagram point: %+v", point)
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}
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}
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if empty := LunarEclipseDiagram(JDECalc(2025, 1, 13), LunarEclipseDiagramOptions{}); len(empty.Points) != 0 {
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t.Fatalf("eclipse-free diagram should have no points, got %d", len(empty.Points))
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}
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}
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