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// 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, 2.66}, // Approximate wind chill (km/h)
{"Warm with humidity", 30, 80, 5, 33.66}, // Approximate heat index (km/h)
{"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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