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package s3lifecycle
import (
"fmt"
"math"
"testing"
"time"
)
func TestGetVersionTimestamp(t *testing.T) {
t.Run("new_format_inverted_timestamp", func(t *testing.T) {
// Simulate a new-format version ID (inverted timestamp above threshold).
now := time.Now()
inverted := math.MaxInt64 - now.UnixNano()
versionId := fmt.Sprintf("%016x", inverted) + "0000000000000000"
got := GetVersionTimestamp(versionId)
// Should recover the original timestamp within 1 second.
diff := got.Sub(now)
if diff < -time.Second || diff > time.Second {
t.Errorf("timestamp diff too large: %v (got %v, want ~%v)", diff, got, now)
}
})
t.Run("old_format_raw_timestamp", func(t *testing.T) {
// Simulate an old-format version ID (raw nanosecond timestamp below threshold).
// Use a timestamp from 2023 which would be below threshold.
ts := time.Date(2023, 6, 15, 12, 0, 0, 0, time.UTC)
versionId := fmt.Sprintf("%016x", ts.UnixNano()) + "abcdef0123456789"
got := GetVersionTimestamp(versionId)
if !got.Equal(ts) {
t.Errorf("expected %v, got %v", ts, got)
}
})
t.Run("null_version_id", func(t *testing.T) {
got := GetVersionTimestamp("null")
if !got.IsZero() {
t.Errorf("expected zero time for null version, got %v", got)
}
})
t.Run("empty_version_id", func(t *testing.T) {
got := GetVersionTimestamp("")
if !got.IsZero() {
t.Errorf("expected zero time for empty version, got %v", got)
}
})
t.Run("short_version_id", func(t *testing.T) {
got := GetVersionTimestamp("abc")
if !got.IsZero() {
t.Errorf("expected zero time for short version, got %v", got)
}
})
t.Run("high_bit_overflow_returns_zero", func(t *testing.T) {
// Version ID with first 16 hex chars > math.MaxInt64 should return zero,
// not a wrapped negative timestamp.
versionId := "80000000000000000000000000000000"
got := GetVersionTimestamp(versionId)
if !got.IsZero() {
t.Errorf("expected zero time for overflow version ID, got %v", got)
}
})
t.Run("invalid_hex", func(t *testing.T) {
got := GetVersionTimestamp("zzzzzzzzzzzzzzzz0000000000000000")
if !got.IsZero() {
t.Errorf("expected zero time for invalid hex, got %v", got)
}
})
}