astro/sun/physical_timezone_test.go

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package sun
import (
"math"
"testing"
"time"
)
func TestPhysicalPreservesInstantAcrossTimezones(t *testing.T) {
utc := time.Date(2026, 4, 28, 9, 30, 45, 123000000, time.UTC)
shanghai := utc.In(time.FixedZone("UTC+8", 8*3600))
got := Physical(shanghai)
want := Physical(utc)
valuesGot := []float64{got.P, got.B0, got.L0}
valuesWant := []float64{want.P, want.B0, want.L0}
for i := range valuesGot {
if math.Float64bits(valuesGot[i]) != math.Float64bits(valuesWant[i]) {
t.Fatalf("timezone instant mismatch at index %d: got %.18f want %.18f", i, valuesGot[i], valuesWant[i])
}
}
}