[#590] fixed realtime events bind order by adding hooks.PreAdd

tools/hook/hook_test.go

@@ -5,18 +5,34 @@ import (
 	"testing"
 )
 
-func TestAdd(t *testing.T) {
+func TestAddAndPreAdd(t *testing.T) {
 	h := Hook[int]{}
 
 	if total := len(h.handlers); total != 0 {
 		t.Fatalf("Expected no handlers, found %d", total)
 	}
 
-	h.Add(func(data int) error { return nil })
-	h.Add(func(data int) error { return nil })
+	triggerSequence := ""
 
-	if total := len(h.handlers); total != 2 {
-		t.Fatalf("Expected 2 handlers, found %d", total)
+	f1 := func(data int) error { triggerSequence += "f1"; return nil }
+	f2 := func(data int) error { triggerSequence += "f2"; return nil }
+	f3 := func(data int) error { triggerSequence += "f3"; return nil }
+	f4 := func(data int) error { triggerSequence += "f4"; return nil }
+
+	h.Add(f1)
+	h.Add(f2)
+	h.PreAdd(f3)
+	h.PreAdd(f4)
+	h.Trigger(1)
+
+	if total := len(h.handlers); total != 4 {
+		t.Fatalf("Expected %d handlers, found %d", 4, total)
+	}
+
+	expectedTriggerSequence := "f4f3f1f2"
+
+	if triggerSequence != expectedTriggerSequence {
+		t.Fatalf("Expected trigger sequence %s, got %s", expectedTriggerSequence, triggerSequence)
 	}
 }