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
108 lines
3.7 KiB
Go
108 lines
3.7 KiB
Go
package basic
|
||
|
||
import (
|
||
"math"
|
||
"testing"
|
||
)
|
||
|
||
func TestDefaultDeltaTFractionalYear(t *testing.T) {
|
||
for _, year := range []float64{-700.5, -0.5, 0, 1000.5, 1582.75, 1800.5, 2000.5, 2026.5} {
|
||
whole := math.Floor(year)
|
||
start := JDCalc(int(whole), 1, 1)
|
||
end := JDCalc(int(whole)+1, 1, 1)
|
||
want := DefaultDeltaTv2(start+(year-whole)*(end-start), true)
|
||
got := DefaultDeltaTv2(year, false)
|
||
if math.IsNaN(got) || math.Abs(got-want) > 1e-10 {
|
||
t.Errorf("year=%v DeltaT=%v, want %v", year, got, want)
|
||
}
|
||
}
|
||
}
|
||
|
||
func TestDefaultDeltaTInvalidInput(t *testing.T) {
|
||
for _, value := range []float64{math.NaN(), math.Inf(1), math.Inf(-1)} {
|
||
for _, isJD := range []bool{false, true} {
|
||
if got := DefaultDeltaTv2(value, isJD); !math.IsNaN(got) {
|
||
t.Errorf("DeltaT(%v, %v)=%v, want NaN", value, isJD, got)
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// 闰秒只改 TT−UTC，不改 TT−UT1：ΔT 在闰秒两侧连续，TT−UTC 才跳 1 秒。
|
||
func TestDeltaTStaysContinuousAcrossLeapSecond(t *testing.T) {
|
||
boundary := 2457754.5
|
||
before := DeltaTv2(boundary - 1e-6)
|
||
after := DeltaTv2(boundary + 1e-6)
|
||
if math.Abs(after-before) > 1e-3 {
|
||
t.Fatalf("ΔT should stay continuous at a leap second: %v → %v", before, after)
|
||
}
|
||
if step := TTMinusUTCSeconds(boundary+1e-6) - TTMinusUTCSeconds(boundary-1e-6); math.Abs(step-1) > 1e-9 {
|
||
t.Fatalf("TT−UTC should step by one second: %v", step)
|
||
}
|
||
if got := DeltaTSplineY(math.NaN()); !math.IsNaN(got) {
|
||
t.Fatalf("DeltaTSplineY(NaN)=%v, want NaN", got)
|
||
}
|
||
}
|
||
|
||
func TestUTC2TTRoundTrip(t *testing.T) {
|
||
for _, year := range []int{-2000, -720, 0, 26, 1426, 2025, 2027, 3627, 4026, 5000} {
|
||
utc := JDCalc(year, 9, 20.123456)
|
||
tt := UTC2TT(utc)
|
||
if got := TT2UTC(tt); math.Abs(got-utc) > math.Nextafter(utc, math.Inf(1))-utc {
|
||
t.Errorf("year=%d UTC round trip differs by %.9f seconds", year, (got-utc)*86400)
|
||
}
|
||
if got := UTC2TT(TT2UTC(tt)); got != tt {
|
||
t.Errorf("year=%d TT round trip differs by %.9f seconds", year, (got-tt)*86400)
|
||
}
|
||
}
|
||
for _, seconds := range []float64{-70, -1, -0.1, 0, 0.1, 1, 70} {
|
||
utc := 2457754.5 + seconds/86400
|
||
if got := TT2UTC(UTC2TT(utc)); got != utc {
|
||
t.Errorf("leap second offset=%g round trip differs by %.9f seconds", seconds, (got-utc)*86400)
|
||
}
|
||
}
|
||
}
|
||
|
||
func TestUTC2TTRoundTripUnderCustomDeltaT(t *testing.T) {
|
||
original := GetDeltaTFn()
|
||
t.Cleanup(func() { SetDeltaTFn(original) })
|
||
for _, slope := range []float64{0, 0.01} {
|
||
SetDeltaTFn(func(jd float64, isJD bool) float64 {
|
||
if !isJD {
|
||
t.Fatal("conversion must request Delta T at a Julian day")
|
||
}
|
||
return 10000 + slope*(jd-2451545)
|
||
})
|
||
utc := 3000000.123456
|
||
if got := TT2UTC(UTC2TT(utc)); got != utc {
|
||
t.Errorf("custom slope=%g round trip differs by %.9f seconds", slope, (got-utc)*86400)
|
||
}
|
||
}
|
||
}
|
||
|
||
// DeltaTSecondsAt：有限值（含 0）是显式覆盖，NaN/±Inf 才回退进程级模型；模型按 UT 求值。
|
||
func TestDeltaTSecondsAtOverrideContract(t *testing.T) {
|
||
jd := 2460310.5
|
||
if got := DeltaTSecondsAt(jd, 0); got != 0 {
|
||
t.Fatalf("explicit zero override = %v, want 0", got)
|
||
}
|
||
if got := DeltaTSecondsAt(jd, 12.5); got != 12.5 {
|
||
t.Fatalf("explicit override = %v, want 12.5", got)
|
||
}
|
||
model := DeltaTSecondsAt(jd, math.NaN())
|
||
if !finite(model) || model <= 0 {
|
||
t.Fatalf("model fallback = %v, want a positive finite value", model)
|
||
}
|
||
if got := DeltaTSecondsAt(jd, math.Inf(1)); got != model {
|
||
t.Fatalf("+Inf override = %v, want the model %v", got, model)
|
||
}
|
||
if got := deltaTModelSecondsAtTT(jd); got != model {
|
||
t.Fatalf("deltaTModelSecondsAtTT = %v, want %v", got, model)
|
||
}
|
||
// 模型按 UT 键控：与"把 TT 直接当 UT"的朴素求值有微小差别。
|
||
naive := DeltaT(jd, true)
|
||
if diff := math.Abs(naive - model); diff > 1e-3 {
|
||
t.Fatalf("UT-keyed model differs from naive TT evaluation by %v s", diff)
|
||
}
|
||
}
|