feat: 扩展天文计算能力

- 新增日食、月食、本地可见性、中心线、半影区域、SVG 图示与沙罗周期信息 - 新增行星冲合、留、方照、物理星历、视直径、相位、亮肢角、轨道节点等计算 - 新增木星伽利略卫星位置、现象与接触事件计算 - 新增恒星星表、星座判定、自行修正与观测辅助能力 - 新增 coord、formula、orbit、sundial、lite/sun、lite/moon 等扩展包 - 完善农历年号、月相英文别名、视差角、大气质量、折射、日晷与双星计算 - 增加 NASA、JPL Horizons、IMCCE 等回归测试数据与基线测试 - 重构基础算法文件组织，补充大量公开 API 注释和语义回归测试 - 更新中文和英文 README，补充示例、精度说明、SVG 配图
2026-05-01 22:38:44 +08:00
parent 98ff574495
commit 3ffdbe0034
365 changed files with 63589 additions and 17508 deletions
@@ -0,0 +1,104 @@
+package svg
+
+import (
+	"strings"
+	"testing"
+	"time"
+
+	"b612.me/astro/basic"
+)
+
+func TestLunarEclipseSVG(t *testing.T) {
+	svg, ok := LunarEclipseSVG(
+		time.Date(2026, 3, 3, 0, 0, 0, 0, time.UTC),
+		LunarEclipseSVGOptions{Width: 720, Height: 480, Step: 10 * time.Minute},
+	)
+	if !ok {
+		t.Fatalf("expected lunar eclipse SVG")
+	}
+	for _, want := range []string{"<svg", "月全食", "黄道", "赤经", "黄经", "狮子座", "方位", "P1", "U1", "U2", "食甚", "U3", "U4", "P4", "UTC+8", "沙罗"} {
+		if !strings.Contains(svg, want) {
+			t.Fatalf("SVG missing %q", want)
+		}
+	}
+	if got := strings.Count(svg, `class="event-moon"`); got != 7 {
+		t.Fatalf("event moon count = %d, want 7", got)
+	}
+}
+
+func TestLunarEclipseSVGEnglishOption(t *testing.T) {
+	svg, ok := LunarEclipseSVG(
+		time.Date(2026, 3, 3, 0, 0, 0, 0, time.UTC),
+		LunarEclipseSVGOptions{Language: "en", Location: time.UTC},
+	)
+	if !ok {
+		t.Fatalf("expected lunar eclipse SVG")
+	}
+	for _, want := range []string{"Total Lunar Eclipse", "Ecliptic", "Moon: RA", "ecl.lon", "PA", "Greatest", "Contacts (UTC)", "Lunar Saros"} {
+		if !strings.Contains(svg, want) {
+			t.Fatalf("SVG missing %q", want)
+		}
+	}
+}
+
+func TestLunarEclipseSVGCustomText(t *testing.T) {
+	svg, ok := LunarEclipseSVG(
+		time.Date(2026, 3, 3, 0, 0, 0, 0, time.UTC),
+		LunarEclipseSVGOptions{
+			Title:           "Custom lunar title",
+			SummaryText:     "Custom lunar summary",
+			MaximumText:     "Custom lunar maximum",
+			CoordinatesText: "Custom lunar coordinates",
+			DurationText:    "Custom lunar duration",
+			MetaText:        "Custom lunar meta",
+			ContactsTitle:   "Custom lunar contacts",
+			DirectionText:   "Custom lunar direction",
+			FooterNote:      "Custom lunar footer",
+		},
+	)
+	if !ok {
+		t.Fatalf("expected lunar eclipse SVG")
+	}
+	for _, want := range []string{
+		"Custom lunar title",
+		"Custom lunar summary",
+		"Custom lunar maximum",
+		"Custom lunar coordinates",
+		"Custom lunar duration",
+		"Custom lunar meta",
+		"Custom lunar contacts",
+		"Custom lunar direction",
+		"Custom lunar footer",
+	} {
+		if !strings.Contains(svg, want) {
+			t.Fatalf("SVG missing custom text %q", want)
+		}
+	}
+}
+
+func TestLunarEclipseSVGNoEvent(t *testing.T) {
+	_, ok := LunarEclipseSVG(time.Date(2026, 1, 3, 0, 0, 0, 0, time.UTC), LunarEclipseSVGOptions{})
+	if ok {
+		t.Fatalf("unexpected lunar eclipse SVG for no-event date")
+	}
+}
+
+func TestLunarEclipseSVGEventPointsExpandMergedLabels(t *testing.T) {
+	events := lunarEclipseSVGEventPoints([]lunarEclipseSVGPoint{
+		{
+			LunarEclipseDiagramPoint: basic.LunarEclipseDiagramPoint{
+				Label:  "Greatest",
+				Labels: []string{"U2", "Greatest", "U3"},
+			},
+		},
+	})
+	if got, want := len(events), 3; got != want {
+		t.Fatalf("event point count = %d, want %d", got, want)
+	}
+	want := []string{"U2", "Greatest", "U3"}
+	for i, label := range want {
+		if events[i].Label != label {
+			t.Fatalf("event labels = %#v, want %v", []string{events[0].Label, events[1].Label, events[2].Label}, want)
+		}
+	}
+}