diff --git a/queue_test.go b/queue_test.go
new file mode 100644
index 0000000..18d0329
--- /dev/null
+++ b/queue_test.go
@@ -0,0 +1,41 @@
+package main
+
+import (
+	"context"
+	"path"
+	"strconv"
+	"testing"
+	"time"
+)
+
+func TestQueue(t *testing.T) {
+	ctx, can := context.WithTimeout(context.Background(), time.Second*10)
+	defer can()
+
+	db, err := NewDB(path.Join(t.TempDir(), "q"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+
+	q := NewQueue(db)
+
+	for i := 0; i < 39; i++ {
+		if err := q.Push(ctx, Message{ID: strconv.Itoa(i), TS: uint64(i)}); err != nil {
+			t.Fatal(i, err)
+		}
+	}
+
+	found := map[uint64]struct{}{}
+	for i := 0; i < 39; i++ {
+		if m, err := q.PeekFirst(ctx); err != nil {
+			t.Fatal(i, err)
+		} else if _, ok := found[m.TS]; ok {
+			t.Error(i, m.TS)
+		} else if err := q.Ack(ctx, m.ID); err != nil {
+			t.Fatal(i, err)
+		} else {
+			found[m.TS] = struct{}{}
+		}
+	}
+}