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
50 lines
2.1 KiB
Go
50 lines
2.1 KiB
Go
package tools
|
|
|
|
import (
|
|
"math"
|
|
"testing"
|
|
)
|
|
|
|
// 参考值由同一组 IAU 定义值独立推出，不使用 9 位凑整常数。
|
|
const (
|
|
testPcPerLy = LightYearKilometers / AstronomicalUnitKilometers / parsecAU
|
|
testAuPerLy = LightYearKilometers / AstronomicalUnitKilometers
|
|
)
|
|
|
|
func assertDistanceClose(t *testing.T, name string, got, want, tolerance float64) {
|
|
t.Helper()
|
|
if math.Abs(got-want) > tolerance {
|
|
t.Fatalf("%s mismatch: got %.15f want %.15f", name, got, want)
|
|
}
|
|
}
|
|
|
|
func TestDistanceToParsecsUnits(t *testing.T) {
|
|
assertDistanceClose(t, "1 pc", DistanceToParsecs(1, DistanceParsec), 1, 1e-15)
|
|
assertDistanceClose(t, "1 ly in pc", DistanceToParsecs(1, DistanceLightYear), testPcPerLy, 1e-15)
|
|
assertDistanceClose(t, "1 ly in pc 参考 0.3066", testPcPerLy, 0.306601394, 1e-9)
|
|
assertDistanceClose(t, "1 pc in ly 参考 3.261563777", 1/testPcPerLy, 3.261563777, 1e-9)
|
|
assertDistanceClose(t, "1 ly in au 参考 63241.077084", DistanceToParsecs(1, DistanceLightYear)*parsecAU, 63241.077084, 1e-6)
|
|
assertDistanceClose(t, "1 pc in au 参考 206264.806247096", DistanceToParsecs(1, DistanceParsec)*parsecAU, 206264.806247096, 1e-9)
|
|
assertDistanceClose(t, "648000/pi au in pc", DistanceToParsecs(parsecAU, DistanceAU), 1, 1e-14)
|
|
}
|
|
|
|
func TestDistanceToParsecsRoundTrip(t *testing.T) {
|
|
for _, pc := range []float64{0.0001, 1, 2.637, 5.7803, 1000} {
|
|
assertDistanceClose(t, "pc round trip", DistanceToParsecs(pc, DistanceParsec), pc, 1e-15)
|
|
ly := pc / testPcPerLy
|
|
assertDistanceClose(t, "pc->ly->pc", DistanceToParsecs(ly, DistanceLightYear), pc, 1e-12)
|
|
assertDistanceClose(t, "au round trip", DistanceToParsecs(pc*parsecAU, DistanceAU), pc, 1e-12)
|
|
}
|
|
}
|
|
|
|
func TestDistanceToParsecsRejectsInvalidInput(t *testing.T) {
|
|
for _, value := range []float64{0, -1, math.NaN(), math.Inf(1), math.Inf(-1)} {
|
|
if got := DistanceToParsecs(value, DistanceParsec); !math.IsNaN(got) {
|
|
t.Fatalf("DistanceToParsecs(%v, parsec) = %v, want NaN", value, got)
|
|
}
|
|
}
|
|
if got := DistanceToParsecs(1, DistanceUnit(200)); !math.IsNaN(got) {
|
|
t.Fatalf("DistanceToParsecs(1, unknown unit) = %v, want NaN", got)
|
|
}
|
|
}
|