lockd/wheel_test.go at main · imharjot/lockd · GitHub

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package lockd

import (
	"testing"
	"time"
)

var wbase = time.Date(2026, 1, 1, 0, 0, 0, 0, time.UTC)

func TestWheelFiresAtDeadline(t *testing.T) {
	w := newTimingWheel(time.Second, 16, wbase)
	w.add("k", wbase.Add(3*time.Second))

	if got := w.advance(wbase.Add(2 * time.Second)); len(got) != 0 {
		t.Fatalf("fired early: %v", got)
	}
	got := w.advance(wbase.Add(3 * time.Second))
	if len(got) != 1 || got[0] != "k" {
		t.Fatalf("expected [k], got %v", got)
	}
	if w.pending() != 0 {
		t.Fatalf("pending = %d, want 0", w.pending())
	}
}

func TestWheelRemoveCancels(t *testing.T) {
	w := newTimingWheel(time.Second, 16, wbase)
	w.add("k", wbase.Add(2*time.Second))
	w.remove("k")
	if got := w.advance(wbase.Add(10 * time.Second)); len(got) != 0 {
		t.Fatalf("cancelled key fired: %v", got)
	}
}

func TestWheelReschedule(t *testing.T) {
	w := newTimingWheel(time.Second, 16, wbase)
	w.add("k", wbase.Add(2*time.Second))
	w.add("k", wbase.Add(5*time.Second)) // move it out

	if got := w.advance(wbase.Add(2 * time.Second)); len(got) != 0 {
		t.Fatalf("fired at old deadline: %v", got)
	}
	got := w.advance(wbase.Add(5 * time.Second))
	if len(got) != 1 || got[0] != "k" {
		t.Fatalf("expected [k] at new deadline, got %v", got)
	}
}

func TestWheelBeyondHorizonClamps(t *testing.T) {
	// horizon is slots-1 ticks; a deadline well past it must still fire,
	// just later, never early.
	w := newTimingWheel(time.Second, 4, wbase) // horizon ~3s
	deadline := wbase.Add(10 * time.Second)
	w.add("k", deadline)

	if got := w.advance(wbase.Add(3 * time.Second)); len(got) != 0 {
		t.Fatalf("clamped key fired before real deadline: %v", got)
	}
	got := w.advance(wbase.Add(10 * time.Second))
	if len(got) != 1 || got[0] != "k" {
		t.Fatalf("clamped key did not fire by real deadline, got %v", got)
	}
}

func TestWheelManyKeysOneTick(t *testing.T) {
	w := newTimingWheel(time.Second, 64, wbase)
	for i := 0; i < 1000; i++ {
		w.add(key(i), wbase.Add(time.Second))
	}
	got := w.advance(wbase.Add(time.Second))
	if len(got) != 1000 {
		t.Fatalf("expired %d keys, want 1000", len(got))
	}
}

func key(i int) string {
	return "k-" + time.Duration(i).String()
}