单元测试和三明治测试之间的区别

单元测试：
单元测试是软件测试级别的类型，其中测试软件的每个单独组件。单元测试通常由开发人员执行。单元测试不能用于那些在不同模块之间有很多相互依赖的系统。它不允许并行测试。

三明治测试：
三明治测试也称为混合集成测试。三明治测试包括自下而上的方法测试和自上而下的方法测试，因此它利用了自下而上方法和自上而下方法的优点。夹心测试也不能用于不同模块之间有很多相互依赖的系统，它允许并行测试。

单元测试和三明治测试的区别：

S.NO	Unit testing	Sandwich testing
1.	In unit testing, software’s module are tested separately.	Sandwich testing comprise the top-down and bottom-up testing.
2.	Defects are identified easily in unit testing.	Defects are not identified easily in sandwich testing testing.
3.	In Unit testing does not matter how big project is.	Sandwich Testing is used for very large projects having sub projects.
4.	Unit testing is cost efficient.	Sandwich testing is not cost efficient.
5.	Unit testing does not allow parallel testing.	Sandwich testing allows parallel testing.
6.	Unit Testing can’t be used for those systems which have a lot of interdependence between different modules.	Sandwich Testing also can not be used for those systems which have a lot of interdependence between different modules.
7.	In Unit testing, there is need of fewer resources for testing.	In Sandwich testing, there is need of large number of resources.