feat(server-go): 和风天气接入与高发病天气预警规则（#12）

server-go/internal/service/weather_risk_test.go

@@ -0,0 +1,77 @@
+package service
+
+import "testing"
+
+func TestRainDays(t *testing.T) {
+	daily := []DailyForecast{
+		{Date: "2026-08-12", TextDay: "小雨", TextNight: "阴"},
+		{Date: "2026-08-13", TextDay: "多云", TextNight: "晴"},
+		{Date: "2026-08-14", TextDay: "雷阵雨", TextNight: "小雨"},
+	}
+	if n := RainDays(daily); n != 2 {
+		t.Errorf("RainDays = %d, want 2", n)
+	}
+	if n := RainDays(nil); n != 0 {
+		t.Errorf("空预报 RainDays = %d, want 0", n)
+	}
+}
+
+func TestWeatherTextRainy(t *testing.T) {
+	if !WeatherTextRainy("小雨") {
+		t.Error("小雨应判为降雨")
+	}
+	if !WeatherTextRainy("雷阵雨") {
+		t.Error("雷阵雨应判为降雨")
+	}
+	if WeatherTextRainy("晴") {
+		t.Error("晴不应判为降雨")
+	}
+}
+
+func TestFungalRisk(t *testing.T) {
+	// 湿度 85 + 未来 2 天降雨 → 白僵病高风险
+	now := WeatherNow{Temp: 27, Humidity: 85, Text: "小雨"}
+	daily := []DailyForecast{
+		{TextDay: "小雨"}, {TextDay: "中雨"}, {TextDay: "多云"},
+	}
+	level, reason := FungalRisk(now, daily)
+	if level != "orange" {
+		t.Errorf("FungalRisk level = %s, want orange（原因 %s）", level, reason)
+	}
+	// 湿度正常 → 无
+	now2 := WeatherNow{Temp: 27, Humidity: 60, Text: "晴"}
+	if l, _ := FungalRisk(now2, daily); l != "" {
+		t.Errorf("湿度 60 不应触发白僵病: %s", l)
+	}
+}
+
+func TestTempSwingRisk(t *testing.T) {
+	if l, _ := TempSwingRisk(32); l != "yellow" {
+		t.Errorf("32℃ 应为 yellow，实际 %s", l)
+	}
+	if l, _ := TempSwingRisk(18); l != "yellow" {
+		t.Errorf("18℃ 应为 yellow，实际 %s", l)
+	}
+	if l, _ := TempSwingRisk(25); l != "" {
+		t.Errorf("25℃ 不应触发，实际 %s", l)
+	}
+}
+
+func TestEvaluateWeatherRules(t *testing.T) {
+	now := WeatherNow{Temp: 32, Humidity: 85, Text: "小雨"}
+	daily := []DailyForecast{{TextDay: "小雨"}, {TextDay: "中雨"}, {TextDay: "多云"}}
+	alerts := EvaluateWeatherRules(now, daily, "late5")
+	if len(alerts) == 0 {
+		t.Fatal("高温高湿+阴雨应产生预警")
+	}
+	found := map[string]bool{}
+	for _, a := range alerts {
+		found[a.Disease] = true
+		if a.Reason == "" {
+			t.Errorf("预警缺少原因: %+v", a)
+		}
+	}
+	if !found["白僵病"] {
+		t.Error("缺少白僵病预警")
+	}
+}