b612
16c62a97d5
- 新增时标、ΔT 模型、质心时间与 UT1 支持 - 改进日月食、月掩、行星事件及路径边界计算 - 完善恒星三维自行与动态距离传播 - 扩展 SVG、GeoJSON、KML 输出与底层距离换算工具 - 整理中英文手册、示例资源及回归测试
97 lines
4.0 KiB
Go
97 lines
4.0 KiB
Go
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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// 带宽契约：解析式 2r/|sin(太阳高度)| 只在南北两限都存在时有定义，单侧极限事件置 0 并标记未定义。
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func TestSolarEclipsePathWidthRequiresBothLimits(t *testing.T) {
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testCases := []struct {
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name string
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date [3]int
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defined bool
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widthKM float64
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}{
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{name: "-1404-01-07 single-sided limit without limits", date: [3]int{-1404, 1, 7}},
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{name: "2003-05-31 single-sided limit with limit lines", date: [3]int{2003, 5, 31}},
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{name: "1874-10-10 single-sided limit with limit lines", date: [3]int{1874, 10, 10}},
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{name: "2024-04-08 total", date: [3]int{2024, 4, 8}, defined: true, widthKM: 198.6161},
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{name: "2010-01-15 annular", date: [3]int{2010, 1, 15}, defined: true, widthKM: 335.0298},
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{name: "4862-09-28 annular", date: [3]int{4862, 9, 28}, defined: true, widthKM: 259.4316},
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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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seed := JDCalc(tc.date[0], tc.date[1], float64(tc.date[2]))
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path := SolarEclipseCentralPath(seed, SolarEclipsePathOptions{})
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info := SolarEclipse(seed)
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if path.Eclipse.PathWidthDefined != tc.defined {
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t.Fatalf("path.Eclipse.PathWidthDefined=%v want %v", path.Eclipse.PathWidthDefined, tc.defined)
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}
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if path.PathWidthDefined != tc.defined {
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t.Fatalf("path.PathWidthDefined=%v want %v", path.PathWidthDefined, tc.defined)
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}
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if info.PathWidthDefined != tc.defined {
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t.Fatalf("info.PathWidthDefined=%v want %v", info.PathWidthDefined, tc.defined)
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}
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if info.PathWidthDefined != (info.Centrality == SolarEclipseCentralTwoLimits) {
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t.Fatalf("info flag %v disagrees with centrality %s", info.PathWidthDefined, info.Centrality)
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}
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if !tc.defined {
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if path.Eclipse.PathWidthKM != 0 || path.Greatest.WidthKM != 0 || info.PathWidthKM != 0 {
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t.Fatalf("undefined width leaks: eclipse=%.4f greatest=%.4f info=%.4f",
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path.Eclipse.PathWidthKM, path.Greatest.WidthKM, info.PathWidthKM)
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}
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} else if math.Abs(path.Eclipse.PathWidthKM-tc.widthKM) > 0.01 {
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t.Fatalf("path width %.4f want %.4f", path.Eclipse.PathWidthKM, tc.widthKM)
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}
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if path.Eclipse.PathWidthKM > 0 && (len(path.NorthernLimit) == 0 || len(path.SouthernLimit) == 0) {
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t.Fatalf("width %.4f km with limits %d/%d", path.Eclipse.PathWidthKM,
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len(path.NorthernLimit), len(path.SouthernLimit))
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}
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if (len(path.NorthernLimit) == 0) != (len(path.SouthernLimit) == 0) {
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t.Fatalf("limits are not paired: %d/%d", len(path.NorthernLimit), len(path.SouthernLimit))
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}
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})
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}
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}
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func TestSolarEclipsePathWidthContractAcrossScan(t *testing.T) {
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start := JDCalc(1998, 1, 1)
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end := JDCalc(2018, 1, 1)
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seenOneLimit, seenTwoLimits := 0, 0
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lastGreatest := 0.0
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for jd := start; jd < end; jd += 15 {
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path := SolarEclipseCentralPath(jd, SolarEclipsePathOptions{SkipCentralBand: true})
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if path.Eclipse.Type == SolarEclipseNone {
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continue
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}
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if lastGreatest != 0 && path.Eclipse.GreatestEclipse-lastGreatest < 1 {
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continue
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}
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lastGreatest = path.Eclipse.GreatestEclipse
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switch path.Eclipse.Centrality {
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case SolarEclipseCentralOneLimit:
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seenOneLimit++
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case SolarEclipseCentralTwoLimits:
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seenTwoLimits++
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}
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bothLimits := len(path.NorthernLimit) > 0 && len(path.SouthernLimit) > 0
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if path.PathWidthDefined && (!bothLimits || path.Eclipse.Centrality != SolarEclipseCentralTwoLimits) {
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t.Fatalf("defined at %s with limits %d/%d", path.Eclipse.Centrality,
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len(path.NorthernLimit), len(path.SouthernLimit))
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}
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if !path.PathWidthDefined && path.Eclipse.PathWidthKM != 0 {
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t.Fatalf("undefined width %.4f km at %.6f", path.Eclipse.PathWidthKM, path.Eclipse.GreatestEclipse)
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}
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if path.Eclipse.PathWidthKM > 0 && (len(path.NorthernLimit) == 0 || len(path.SouthernLimit) == 0) {
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t.Fatalf("width %.4f km with limits %d/%d at %.6f", path.Eclipse.PathWidthKM,
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len(path.NorthernLimit), len(path.SouthernLimit), path.Eclipse.GreatestEclipse)
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}
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}
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if seenOneLimit == 0 || seenTwoLimits == 0 {
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t.Fatalf("scan covered %d one-limit and %d two-limit events, want both kinds", seenOneLimit, seenTwoLimits)
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}
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}
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