78 lines
3.0 KiB
Go
78 lines
3.0 KiB
Go
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package svg
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import (
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"fmt"
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"math"
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"strings"
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"testing"
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"time"
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)
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// 本文件钉住星掩图的"掩带宽"口径与行星图、详细版一致：取南北限地面间距，
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// 不得与 Greatest.WidthKM 互相换算。
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func TestStarOccultationSVGUsesLimitSeparationBandWidth(t *testing.T) {
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path := sampleStarOccultationPath()
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path.GreatestLimitSeparationKM = 3123.4
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path.Greatest.WidthKM = 3456.7
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diagram, err := StarOccultationPathSVG(path, StarOccultationSVGOptions{Width: 1200, Height: 800, Location: time.UTC})
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if err != nil {
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t.Fatalf("StarOccultationPathSVG() error = %v", err)
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}
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if !strings.Contains(diagram, "3123.4 km") {
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t.Fatal("stellar SVG band width does not use GreatestLimitSeparationKM")
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}
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if strings.Contains(diagram, "3456.7 km") {
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t.Fatal("stellar SVG band width still uses Greatest.WidthKM")
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}
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}
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func TestStarOccultationSVGBandWidthFallsBackToGreatestWidth(t *testing.T) {
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path := sampleStarOccultationPath()
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path.GreatestLimitSeparationKM = 0
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path.Greatest.WidthKM = 3456.7
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diagram, err := StarOccultationPathSVG(path, StarOccultationSVGOptions{Width: 1200, Height: 800, Location: time.UTC})
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if err != nil {
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t.Fatalf("StarOccultationPathSVG() error = %v", err)
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}
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if !strings.Contains(diagram, "3456.7 km") {
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t.Fatal("stellar SVG band width lost the Greatest.WidthKM fallback for paths without limit separations")
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}
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}
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func TestOccultationBandWidthSourcesAreNotInterchangeable(t *testing.T) {
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starPath := occultationTestStarPath(t)
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if starPath.GreatestLimitSeparationKM <= 0 || starPath.Greatest.WidthKM <= 0 {
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t.Fatalf("fixture widths = %.3f / %.3f, want both populated",
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starPath.GreatestLimitSeparationKM, starPath.Greatest.WidthKM)
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}
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if math.Abs(starPath.GreatestLimitSeparationKM-starPath.Greatest.WidthKM) < 1 {
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t.Fatalf("fixture widths %.3f / %.3f are equal; the semantics check would be vacuous",
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starPath.GreatestLimitSeparationKM, starPath.Greatest.WidthKM)
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}
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diagram, err := StarOccultationPathSVG(starPath, StarOccultationSVGOptions{Width: 1200, Height: 800, Location: time.UTC})
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if err != nil {
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t.Fatalf("StarOccultationPathSVG() error = %v", err)
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}
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expected := occultationTestWidthText(starPath.GreatestLimitSeparationKM)
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if !strings.Contains(diagram, expected) {
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t.Fatalf("stellar SVG is missing the limit-separation width %q", expected)
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}
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if other := occultationTestWidthText(starPath.Greatest.WidthKM); strings.Contains(diagram, other) {
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t.Fatalf("stellar SVG reports the non-interchangeable Greatest.WidthKM %q", other)
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}
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planetPath := occultationTestSaturnPath(t)
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planetDiagram, err := PlanetOccultationPathSVG(planetPath, StarOccultationSVGOptions{Width: 1200, Height: 800, Location: time.UTC})
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if err != nil {
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t.Fatalf("PlanetOccultationPathSVG() error = %v", err)
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}
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if expected := occultationTestWidthText(planetPath.GreatestLimitSeparationKM); !strings.Contains(planetDiagram, expected) {
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t.Fatalf("planetary SVG is missing the limit-separation width %q", expected)
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}
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}
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func occultationTestWidthText(width float64) string {
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return fmt.Sprintf("%.1f km", width)
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}
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