我应该如何对一个简单的CRUD类进行单元测试？

import unittest
from mycrud import MyCRUD

class MyCRUDTestCase(unittest.TestCase):
    def setUp(self):
        # 设置测试环境，例如创建临时数据库或文件
        self.crud = MyCRUD()

    def tearDown(self):
        # 清理测试环境，例如删除临时数据库或文件
        pass

    def test_create_record(self):
        # 测试创建记录功能
        record_id = self.crud.create_record({"name": "John", "age": 30})
        self.assertIsNotNone(record_id)

    def test_read_record(self):
        # 测试读取记录功能
        record = self.crud.read_record(1)
        self.assertIsNotNone(record)
        self.assertEqual(record["name"], "John")

    def test_update_record(self):
        # 测试更新记录功能
        updated = self.crud.update_record(1, {"name": "Jane"})
        self.assertTrue(updated)

        record = self.crud.read_record(1)
        self.assertEqual(record["name"], "Jane")

    def test_delete_record(self):
        # 测试删除记录功能
        deleted = self.crud.delete_record(1)
        self.assertTrue(deleted)

        record = self.crud.read_record(1)
        self.assertIsNone(record)

if __name__ == '__main__':
    unittest.main()