} else if gotUsers[0].ID != u1.ID {
			t.Fatalf("select expects: %v, got %v", u1.ID, gotUsers[0].ID)
		} else if gotUsers[1].ID != u2.ID {
			t.Fatalf("select expects: %v, got %v", u2.ID, gotUsers[1].ID)
		}

		u1.Name = "Jinzhu"
		u2.Name = "Zhang"
		if results := DB.Save([]*user{&u1, &u2}); results.Error != nil {
			t.Fatalf("errors happened on update: %v", results.Error)
		} else if results.RowsAffected != 2 {