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package event
import (
"testing"
"ior/internal/types"
)
func TestPairCalculateDurationsFirstEvent(t *testing.T) {
enter := &types.OpenEvent{
Time: 1000,
Pid: 1,
Tid: 2,
}
exit := &types.RetEvent{
Time: 1100,
Pid: 1,
Tid: 2,
Ret: 0,
}
pair := NewPair(enter)
pair.ExitEv = exit
pair.CalculateDurations(0)
if pair.Duration != 100 {
t.Fatalf("Duration = %d, want 100", pair.Duration)
}
if pair.DurationToPrev != 0 {
t.Fatalf("DurationToPrev = %d, want 0 for first event", pair.DurationToPrev)
}
}
func TestPairCalculateDurationsWithPreviousExit(t *testing.T) {
enter := &types.OpenEvent{
Time: 2000,
Pid: 1,
Tid: 2,
}
exit := &types.RetEvent{
Time: 2100,
Pid: 1,
Tid: 2,
Ret: 0,
}
pair := NewPair(enter)
pair.ExitEv = exit
pair.CalculateDurations(1500)
if pair.Duration != 100 {
t.Fatalf("Duration = %d, want 100", pair.Duration)
}
if pair.DurationToPrev != 500 {
t.Fatalf("DurationToPrev = %d, want 500", pair.DurationToPrev)
}
}
// TestPairCalculateDurationsNegativeDelta verifies that non-monotonic BPF
// timestamps (exit < enter due to cross-CPU clock skew) do not cause uint64
// underflow. Both Duration and DurationToPrev must clamp to zero.
func TestPairCalculateDurationsNegativeDelta(t *testing.T) {
enter := &types.OpenEvent{
Time: 2000,
Pid: 1,
Tid: 2,
}
// Simulate clock skew: exit timestamp is earlier than enter.
exit := &types.RetEvent{
Time: 1900,
Pid: 1,
Tid: 2,
Ret: 0,
}
pair := NewPair(enter)
pair.ExitEv = exit
// prevPairTime > enterTime also triggers underflow in DurationToPrev.
pair.CalculateDurations(3000)
if pair.Duration != 0 {
t.Fatalf("Duration = %d, want 0 when exit < enter (underflow guard)", pair.Duration)
}
if pair.DurationToPrev != 0 {
t.Fatalf("DurationToPrev = %d, want 0 when enter < prevPairTime (underflow guard)", pair.DurationToPrev)
}
}
func TestPairRecycleHandlesMissingExitEvent(t *testing.T) {
pair := NewPair(&types.OpenEvent{
Time: 1000,
Pid: 1,
Tid: 2,
})
pair.Recycle()
}
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