test: add timezone package tests
Add comprehensive tests for timezone functionality: - Init (valid/invalid timezones, default) - getUTCOffset - Now (with/without location) - Location (with/without location) - Name (with/without name) - StartOfDay, Today, EndOfDay - StartOfWeek (Monday-based) - StartOfMonth - ParseInLocation - ParseInUserLocation (valid/empty/invalid TZ) - NowInUserLocation - StartOfDayInUserLocation Coverage: timezone 45.2% → 93.5%
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Your Name
@@ -3,135 +3,307 @@ package timezone
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import (
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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func TestInit(t *testing.T) {
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// Test with valid timezone
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err := Init("Asia/Shanghai")
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if err != nil {
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t.Fatalf("Init failed with valid timezone: %v", err)
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// Save original state
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originalLoc := location
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originalTzName := tzName
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defer func() {
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location = originalLoc
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tzName = originalTzName
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}()
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tests := []struct {
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name string
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tz string
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wantErr bool
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wantName string
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}{
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{
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name: "valid timezone Asia/Shanghai",
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tz: "Asia/Shanghai",
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wantErr: false,
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wantName: "Asia/Shanghai",
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},
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{
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name: "valid timezone UTC",
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tz: "UTC",
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wantErr: false,
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wantName: "UTC",
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},
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{
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name: "empty string uses default",
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tz: "",
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wantErr: false,
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wantName: "Asia/Shanghai",
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},
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{
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name: "invalid timezone",
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tz: "Invalid/Timezone",
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wantErr: true,
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wantName: "",
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},
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}
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// Verify time.Local was set
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if time.Local.String() != "Asia/Shanghai" {
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t.Errorf("time.Local not set correctly, got %s", time.Local.String())
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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// Reset state
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location = nil
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tzName = ""
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// Verify our location variable
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if Location().String() != "Asia/Shanghai" {
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t.Errorf("Location() not set correctly, got %s", Location().String())
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}
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// Test Name()
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if Name() != "Asia/Shanghai" {
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t.Errorf("Name() not set correctly, got %s", Name())
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err := Init(tt.tz)
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if tt.wantErr {
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assert.Error(t, err)
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} else {
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assert.NoError(t, err)
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assert.Equal(t, tt.wantName, Name())
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}
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})
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}
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}
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func TestInitInvalidTimezone(t *testing.T) {
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err := Init("Invalid/Timezone")
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if err == nil {
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t.Error("Init should fail with invalid timezone")
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}
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func TestGetUTCOffset(t *testing.T) {
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loc, _ := time.LoadLocation("Asia/Shanghai")
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offset := getUTCOffset(loc)
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assert.NotEmpty(t, offset)
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// Should be +08:00 for Shanghai
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assert.Contains(t, offset, "+")
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}
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func TestTimeNowAffected(t *testing.T) {
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// Reset to UTC first
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if err := Init("UTC"); err != nil {
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t.Fatalf("Init failed with UTC: %v", err)
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}
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utcNow := time.Now()
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func TestNow(t *testing.T) {
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// Save and restore
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originalLoc := location
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defer func() { location = originalLoc }()
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// Switch to Shanghai (UTC+8)
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if err := Init("Asia/Shanghai"); err != nil {
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t.Fatalf("Init failed with Asia/Shanghai: %v", err)
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}
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shanghaiNow := time.Now()
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t.Run("with location set", func(t *testing.T) {
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loc, _ := time.LoadLocation("Asia/Shanghai")
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location = loc
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now := Now()
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assert.NotZero(t, now)
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})
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// The times should be the same instant, but different timezone representation
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// Shanghai should be 8 hours ahead in display
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_, utcOffset := utcNow.Zone()
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_, shanghaiOffset := shanghaiNow.Zone()
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expectedDiff := 8 * 3600 // 8 hours in seconds
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actualDiff := shanghaiOffset - utcOffset
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if actualDiff != expectedDiff {
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t.Errorf("Timezone offset difference incorrect: expected %d, got %d", expectedDiff, actualDiff)
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}
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t.Run("without location", func(t *testing.T) {
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location = nil
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now := Now()
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assert.NotZero(t, now)
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})
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}
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func TestToday(t *testing.T) {
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if err := Init("Asia/Shanghai"); err != nil {
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t.Fatalf("Init failed with Asia/Shanghai: %v", err)
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}
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func TestLocation(t *testing.T) {
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// Save and restore
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originalLoc := location
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defer func() { location = originalLoc }()
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today := Today()
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now := Now()
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t.Run("with location set", func(t *testing.T) {
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loc, _ := time.LoadLocation("Asia/Shanghai")
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location = loc
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assert.Equal(t, loc, Location())
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})
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// Today should be at 00:00:00
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if today.Hour() != 0 || today.Minute() != 0 || today.Second() != 0 {
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t.Errorf("Today() not at start of day: %v", today)
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}
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t.Run("without location", func(t *testing.T) {
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location = nil
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assert.Equal(t, time.Local, Location())
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})
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}
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// Today should be same date as now
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if today.Year() != now.Year() || today.Month() != now.Month() || today.Day() != now.Day() {
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t.Errorf("Today() date mismatch: today=%v, now=%v", today, now)
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}
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func TestName(t *testing.T) {
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// Save and restore
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originalName := tzName
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defer func() { tzName = originalName }()
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t.Run("with name set", func(t *testing.T) {
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tzName = "Asia/Shanghai"
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assert.Equal(t, "Asia/Shanghai", Name())
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})
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t.Run("without name", func(t *testing.T) {
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tzName = ""
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assert.Equal(t, "Local", Name())
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})
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}
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func TestStartOfDay(t *testing.T) {
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if err := Init("Asia/Shanghai"); err != nil {
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t.Fatalf("Init failed with Asia/Shanghai: %v", err)
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// Save and restore
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originalLoc := location
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defer func() { location = originalLoc }()
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loc, _ := time.LoadLocation("Asia/Shanghai")
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location = loc
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now := time.Date(2024, 6, 15, 14, 30, 45, 0, loc)
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start := StartOfDay(now)
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assert.Equal(t, 2024, start.Year())
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assert.Equal(t, time.Month(6), start.Month())
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assert.Equal(t, 15, start.Day())
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assert.Equal(t, 0, start.Hour())
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assert.Equal(t, 0, start.Minute())
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assert.Equal(t, 0, start.Second())
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}
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func TestToday(t *testing.T) {
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// Save and restore
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originalLoc := location
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defer func() { location = originalLoc }()
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loc, _ := time.LoadLocation("Asia/Shanghai")
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location = loc
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today := Today()
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assert.Equal(t, 0, today.Hour())
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assert.Equal(t, 0, today.Minute())
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assert.Equal(t, 0, today.Second())
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}
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func TestEndOfDay(t *testing.T) {
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// Save and restore
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originalLoc := location
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defer func() { location = originalLoc }()
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loc, _ := time.LoadLocation("Asia/Shanghai")
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location = loc
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now := time.Date(2024, 6, 15, 14, 30, 45, 0, loc)
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end := EndOfDay(now)
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assert.Equal(t, 2024, end.Year())
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assert.Equal(t, time.Month(6), end.Month())
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assert.Equal(t, 15, end.Day())
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assert.Equal(t, 23, end.Hour())
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assert.Equal(t, 59, end.Minute())
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assert.Equal(t, 59, end.Second())
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}
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func TestStartOfWeek(t *testing.T) {
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// Save and restore
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originalLoc := location
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defer func() { location = originalLoc }()
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loc, _ := time.LoadLocation("Asia/Shanghai")
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location = loc
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// Friday June 14, 2024
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friday := time.Date(2024, 6, 14, 10, 0, 0, 0, loc)
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start := StartOfWeek(friday)
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// Should be Monday June 10, 2024
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assert.Equal(t, 2024, start.Year())
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assert.Equal(t, time.Month(6), start.Month())
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assert.Equal(t, 10, start.Day())
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assert.Equal(t, time.Monday, start.Weekday())
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}
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func TestStartOfMonth(t *testing.T) {
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// Save and restore
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originalLoc := location
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defer func() { location = originalLoc }()
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loc, _ := time.LoadLocation("Asia/Shanghai")
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location = loc
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midMonth := time.Date(2024, 6, 15, 10, 0, 0, 0, loc)
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start := StartOfMonth(midMonth)
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assert.Equal(t, 2024, start.Year())
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assert.Equal(t, time.Month(6), start.Month())
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assert.Equal(t, 1, start.Day())
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}
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func TestParseInLocation(t *testing.T) {
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// Save and restore
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originalLoc := location
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defer func() { location = originalLoc }()
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loc, _ := time.LoadLocation("Asia/Shanghai")
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location = loc
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parsed, err := ParseInLocation("2006-01-02", "2024-06-15")
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require.NoError(t, err)
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assert.Equal(t, 2024, parsed.Year())
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assert.Equal(t, time.Month(6), parsed.Month())
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assert.Equal(t, 15, parsed.Day())
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}
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func TestParseInUserLocation(t *testing.T) {
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// Save and restore
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originalLoc := location
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defer func() { location = originalLoc }()
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loc, _ := time.LoadLocation("Asia/Shanghai")
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location = loc
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tests := []struct {
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name string
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userTZ string
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}{
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{"with valid user timezone", "America/New_York"},
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{"with empty user timezone", ""},
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{"with invalid user timezone", "Invalid/Zone"},
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}
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// Create a time at 15:30:45
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testTime := time.Date(2024, 6, 15, 15, 30, 45, 123456789, Location())
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startOfDay := StartOfDay(testTime)
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expected := time.Date(2024, 6, 15, 0, 0, 0, 0, Location())
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if !startOfDay.Equal(expected) {
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t.Errorf("StartOfDay incorrect: expected %v, got %v", expected, startOfDay)
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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parsed, err := ParseInUserLocation("2006-01-02", "2024-06-15", tt.userTZ)
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require.NoError(t, err)
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assert.Equal(t, 2024, parsed.Year())
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assert.Equal(t, time.Month(6), parsed.Month())
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})
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}
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}
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func TestTruncateVsStartOfDay(t *testing.T) {
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// This test demonstrates why Truncate(24*time.Hour) can be problematic
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// and why StartOfDay is more reliable for timezone-aware code
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func TestNowInUserLocation(t *testing.T) {
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// Save and restore
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originalLoc := location
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defer func() { location = originalLoc }()
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if err := Init("Asia/Shanghai"); err != nil {
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t.Fatalf("Init failed with Asia/Shanghai: %v", err)
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loc, _ := time.LoadLocation("Asia/Shanghai")
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location = loc
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tests := []struct {
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name string
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userTZ string
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}{
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{"with valid user timezone", "America/New_York"},
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{"with empty user timezone", ""},
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{"with invalid user timezone", "Invalid/Zone"},
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}
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now := Now()
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// Truncate operates on UTC, not local time
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truncated := now.Truncate(24 * time.Hour)
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// StartOfDay operates on local time
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startOfDay := StartOfDay(now)
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// These will likely be different for non-UTC timezones
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t.Logf("Now: %v", now)
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t.Logf("Truncate(24h): %v", truncated)
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t.Logf("StartOfDay: %v", startOfDay)
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// The truncated time may not be at local midnight
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// StartOfDay is always at local midnight
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if startOfDay.Hour() != 0 {
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t.Errorf("StartOfDay should be at hour 0, got %d", startOfDay.Hour())
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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now := NowInUserLocation(tt.userTZ)
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assert.NotZero(t, now)
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})
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}
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}
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func TestDSTAwareness(t *testing.T) {
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// Test with a timezone that has DST (America/New_York)
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err := Init("America/New_York")
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if err != nil {
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t.Skipf("America/New_York timezone not available: %v", err)
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func TestStartOfDayInUserLocation(t *testing.T) {
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// Save and restore
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originalLoc := location
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defer func() { location = originalLoc }()
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loc, _ := time.LoadLocation("Asia/Shanghai")
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location = loc
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now := time.Date(2024, 6, 15, 14, 30, 0, 0, loc)
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tests := []struct {
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name string
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userTZ string
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}{
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{"with valid user timezone", "America/New_York"},
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{"with empty user timezone", ""},
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{"with invalid user timezone", "Invalid/Zone"},
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}
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// Just verify it doesn't crash
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_ = Today()
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_ = Now()
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_ = StartOfDay(Now())
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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start := StartOfDayInUserLocation(now, tt.userTZ)
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assert.Equal(t, 0, start.Hour())
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assert.Equal(t, 0, start.Minute())
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})
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}
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}
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