diff --git a/tests/migrate_test.go b/tests/migrate_test.go
index b23c6714..51ebc844 100644
--- a/tests/migrate_test.go
+++ b/tests/migrate_test.go
@@ -141,15 +141,55 @@ func TestAutoMigrateSelfReferential(t *testing.T) {
 	}
 }
 
+func TestAutoMigrateNullable(t *testing.T) {
+	type UserMigrateColumn struct {
+		ID    uint
+		Bonus float64 `gorm:"not null"`
+		Stock float64
+	}
+
+	DB.Migrator().DropTable(&UserMigrateColumn{})
+
+	DB.AutoMigrate(&UserMigrateColumn{})
+
+	type UserMigrateColumn2 struct {
+		ID    uint
+		Bonus float64
+		Stock float64 `gorm:"not null"`
+	}
+
+	if err := DB.Table("user_migrate_columns").AutoMigrate(&UserMigrateColumn2{}); err != nil {
+		t.Fatalf("failed to auto migrate, got error: %v", err)
+	}
+
+	columnTypes, err := DB.Table("user_migrate_columns").Migrator().ColumnTypes(&UserMigrateColumn{})
+	if err != nil {
+		t.Fatalf("failed to get column types, got error: %v", err)
+	}
+
+	for _, columnType := range columnTypes {
+		switch columnType.Name() {
+		case "bonus":
+			// allow to change non-nullable to nullable
+			if nullable, _ := columnType.Nullable(); !nullable {
+				t.Fatalf("bonus's nullable should be true, bug got %t", nullable)
+			}
+		case "stock":
+			// do not allow to change nullable to non-nullable
+			if nullable, _ := columnType.Nullable(); !nullable {
+				t.Fatalf("stock's nullable should be true, bug got %t", nullable)
+			}
+		}
+	}
+}
+
 func TestSmartMigrateColumn(t *testing.T) {
 	fullSupported := map[string]bool{"mysql": true, "postgres": true}[DB.Dialector.Name()]
 
 	type UserMigrateColumn struct {
-		ID     uint
-		Name   string
-		Salary float64
-		//Bonus    float64 `gorm:"not null"`
-		//Stock    float64
+		ID       uint
+		Name     string
+		Salary   float64
 		Birthday time.Time `gorm:"precision:4"`
 	}
 
@@ -158,11 +198,9 @@ func TestSmartMigrateColumn(t *testing.T) {
 	DB.AutoMigrate(&UserMigrateColumn{})
 
 	type UserMigrateColumn2 struct {
-		ID     uint
-		Name   string  `gorm:"size:128"`
-		Salary float64 `gorm:"precision:2"`
-		//Bonus               float64
-		//Stock               float64   `gorm:"not null"`
+		ID                  uint
+		Name                string    `gorm:"size:128"`
+		Salary              float64   `gorm:"precision:2"`
 		Birthday            time.Time `gorm:"precision:2"`
 		NameIgnoreMigration string    `gorm:"size:100"`
 	}
@@ -186,16 +224,6 @@ func TestSmartMigrateColumn(t *testing.T) {
 			if precision, o, _ := columnType.DecimalSize(); (fullSupported || precision != 0) && precision != 2 {
 				t.Fatalf("salary's precision should be 2, but got %v %v", precision, o)
 			}
-		//case "bonus":
-		//	// allow to change non-nullable to nullable
-		//	if nullable, _ := columnType.Nullable(); !nullable {
-		//		t.Fatalf("bonus's nullable should be true, bug got %t", nullable)
-		//	}
-		//case "stock":
-		//	// do not allow to change nullable to non-nullable
-		//	if nullable, _ := columnType.Nullable(); !nullable {
-		//		t.Fatalf("stock's nullable should be true, bug got %t", nullable)
-		//	}
 		case "birthday":
 			if precision, _, _ := columnType.DecimalSize(); (fullSupported || precision != 0) && precision != 2 {
 				t.Fatalf("birthday's precision should be 2, but got %v", precision)