80 lines
3.1 KiB
Go
80 lines
3.1 KiB
Go
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package svg
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import (
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"strings"
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"testing"
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"time"
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eclipsecore "b612.me/astro/eclipse"
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)
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func solarEclipseIsochroneMapOptions() SolarEclipseMapSVGOptions {
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return SolarEclipseMapSVGOptions{
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Width: 900, Height: 620, Location: time.UTC, PartialStep: 10 * time.Minute,
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GreatestTimeStep: solarEclipseMapDefaultGreatestTimeStep,
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}
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}
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// 等时线是可选图层：不请求时不得出现在输出里，请求时路径与标注都必须绘制。
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func TestSolarEclipseMapGreatestTimeIsochrones(t *testing.T) {
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date := time.Date(2009, time.July, 22, 0, 0, 0, 0, time.UTC)
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rendered, ok := SolarEclipseMapSVG(date, solarEclipseIsochroneMapOptions())
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if !ok {
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t.Fatal("missing map")
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}
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if !strings.Contains(rendered, `class="solar-greatest-time-isoline"`) {
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t.Fatal("isochrone paths missing from a map that requested them")
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}
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if !strings.Contains(rendered, `class="solar-greatest-time-label"`) {
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t.Fatal("isochrone labels missing from a map that requested them")
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}
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// 等时线是 opt-in：零值和负值都不画，与核心层和 moon/svg 一致；30 分钟只是 NASA 全球图的推荐间隔。
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if got := normalizeSolarEclipseMapSVGOptions(date, SolarEclipseMapSVGOptions{}).GreatestTimeStep; got != 0 {
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t.Fatalf("default isochrone step = %s, want them disabled", got)
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}
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if solarEclipseMapDefaultGreatestTimeStep != 30*time.Minute {
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t.Fatalf("recommended NASA isochrone step = %s, want 30m", solarEclipseMapDefaultGreatestTimeStep)
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}
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for _, step := range []time.Duration{0, -1} {
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disabled, ok := SolarEclipseMapSVG(date, SolarEclipseMapSVGOptions{
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Width: 900, Height: 620, Location: time.UTC, PartialStep: 10 * time.Minute,
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GreatestTimeStep: step,
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})
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if !ok {
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t.Fatal("missing map")
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}
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if strings.Contains(disabled, "solar-greatest-time-isoline") ||
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strings.Contains(disabled, "solar-greatest-time-label") {
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t.Fatalf("step %s must not draw isochrones", step)
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}
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}
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// 正值小于一分钟时夹取到一分钟，而不是关闭。
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clamped := normalizeSolarEclipseMapSVGOptions(date, SolarEclipseMapSVGOptions{GreatestTimeStep: time.Second})
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if clamped.GreatestTimeStep != time.Minute {
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t.Fatalf("sub-minute isochrone step = %s, want it clamped to one minute", clamped.GreatestTimeStep)
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}
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}
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// 电平必须落在偏食可见窗口内并按步长对齐，避免 59.999 秒那类截断。
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func TestSolarEclipseMapGreatestTimeLevelsAlignToStep(t *testing.T) {
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date := time.Date(2009, time.July, 22, 0, 0, 0, 0, time.UTC)
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options := normalizeSolarEclipseMapSVGOptions(date, solarEclipseIsochroneMapOptions())
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info, ok := eclipsecore.SolarEclipseOnDateNASABulletinSplitK(date)
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if !ok {
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t.Fatal("missing eclipse")
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}
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levels := solarEclipseGreatestTimeLevels(info, options)
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if len(levels) < 5 {
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t.Fatalf("expected a full isochrone fan, got %d levels", len(levels))
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}
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for _, level := range levels {
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if level.Second() != 0 || level.Nanosecond() != 0 || level.Minute()%30 != 0 {
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t.Fatalf("level %s is not aligned to the requested step", level.Format("15:04:05.000"))
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}
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if level.Before(info.PartialBeginOnEarth) || level.After(info.PartialEndOnEarth) {
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t.Fatalf("level %s is outside the partial-eclipse window", level.Format("15:04:05"))
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}
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}
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}
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