diff --git a/testing.go b/testing.go
index 9624061..de6610d 100644
--- a/testing.go
+++ b/testing.go
@@ -281,7 +281,7 @@ type commonTestFunc func(t assert.TestingT)
 
 var logTime = time.Now()
 
-func initTest(t assert.TestingT) *Engine {
+func initCommonTest(t assert.TestingT) *Engine {
 	f, err := os.OpenFile(
 		fmt.Sprintf("test-logs/test-%d.log", logTime.UnixMilli()),
 		os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
@@ -292,7 +292,19 @@ func initTest(t assert.TestingT) *Engine {
 	})
 	assert.Nil(t, err)
 	e.Models(user{}, story{}, band{}, role{})
-	err = e.MigrateDropping()
+	return e
+}
+
+func deleteAll(e *Engine) {
+	models := []any{&user{}, &story{}, &band{}, &role{}}
+	for _, model := range models {
+		e.Model(model).WhereRaw("true").Delete()
+	}
+}
+
+func initTest(t assert.TestingT) *Engine {
+	e := initCommonTest(t)
+	err := e.MigrateDropping()
 	assert.Nil(t, err)
 	return e
 }
@@ -320,8 +332,9 @@ func checkChapters(t assert.TestingT, s *story) {
 
 func bench(fn func(assert.TestingT, *Engine)) func(b *testing.B) {
 	return func(b *testing.B) {
-		e := initTest(b)
+		e := initCommonTest(b)
 		for b.Loop() {
+			deleteAll(e)
 			fn(b, e)
 		}
 		e.Disconnect()