From 757f611a4d738688bc97cc6787ecce8650f25873 Mon Sep 17 00:00:00 2001
From: Petri Hienonen <petri.hienonen@gmail.com>
Date: Sun, 1 Feb 2026 17:31:30 +0200
Subject: Second

---
 forecast_test.go | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 forecast_test.go

(limited to 'forecast_test.go')

diff --git a/forecast_test.go b/forecast_test.go
new file mode 100644
index 0000000..06a3dc7
--- /dev/null
+++ b/forecast_test.go
@@ -0,0 +1,81 @@
+// forecast_test.go - Unit tests (example)
+package main
+
+import (
+	"math"
+	"testing"
+	"time"
+)
+
+func TestCalculateFeelsLike(t *testing.T) {
+	tests := []struct {
+		name      string
+		temp      float64
+		humidity  float64
+		windSpeed float64
+		want      float64
+	}{
+		{"Cold with wind", 5, 80, 10, 0.49},      // Approximate wind chill
+		{"Warm with humidity", 30, 80, 5, 32.65}, // Approximate heat index
+		{"Moderate", 20, 50, 5, 20},              // No adjustment
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := CalculateFeelsLike(tt.temp, tt.humidity, tt.windSpeed)
+			if math.Abs(got-tt.want) > 1.0 { // Allow 1 degree tolerance
+				t.Errorf("CalculateFeelsLike() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestWeatherMapper(t *testing.T) {
+	mapper := NewWeatherMapper()
+	sunrise := time.Date(2026, 2, 1, 8, 0, 0, 0, time.UTC)
+	sunset := time.Date(2026, 2, 1, 16, 0, 0, 0, time.UTC)
+
+	tests := []struct {
+		symbol   int
+		time     time.Time
+		wantID   int
+		wantIcon string
+	}{
+		{1, sunrise.Add(2 * time.Hour), 800, "01d"}, // Clear, daytime
+		{1, sunset.Add(2 * time.Hour), 800, "01n"},  // Clear, nighttime
+		{25, sunrise, 500, "10d"},                   // Light rain, daytime
+		{91, sunset, 200, "11n"},                    // Thunderstorm, nighttime
+	}
+
+	for _, tt := range tests {
+		t.Run("", func(t *testing.T) {
+			weather := mapper.Map(tt.symbol, tt.time, sunrise, sunset)
+			if weather.ID != tt.wantID {
+				t.Errorf("Weather.ID = %v, want %v", weather.ID, tt.wantID)
+			}
+			if weather.Icon != tt.wantIcon {
+				t.Errorf("Weather.Icon = %v, want %v", weather.Icon, tt.wantIcon)
+			}
+		})
+	}
+}
+
+func TestSunCalculator(t *testing.T) {
+	calculator := NewSunCalculator(60.169, 24.935, 2) // Helsinki
+
+	date := time.Date(2026, 2, 1, 0, 0, 0, 0, time.UTC)
+	sunrise, sunset, err := calculator.Calculate(date)
+
+	if err != nil {
+		t.Errorf("SunCalculator.Calculate() error = %v", err)
+	}
+
+	if sunrise.IsZero() || sunset.IsZero() {
+		t.Errorf("Sunrise or sunset is zero")
+	}
+
+	// Sunrise should be before sunset
+	if !sunrise.Before(sunset) {
+		t.Errorf("Sunrise %v not before sunset %v", sunrise, sunset)
+	}
+}
-- 
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