什么是对象模拟，我什么时候需要它? [英] What is Object Mocking and when do I need it?

问题描述

许多人在编写单元测试时使用 Mock Objects.什么是模拟对象?为什么我需要一个?我需要模拟对象框架吗?

Many people use Mock Objects when they are writing unit tests. What is a Mock Object? Why would I ever need one? Do I need a Mock Object Framework?

推荐答案

Object Mocking 用于将依赖项排除在单元测试之外.有时你会有一个像SelectPerson"这样的测试，它会从数据库中选择一个人并返回一个 Person 对象.

Object Mocking is used to keep dependencies out of your unit test. Sometimes you'll have a test like "SelectPerson" which will select a person from the database and return a Person object.

要做到这一点，您通常需要依赖于数据库，但是通过对象模拟，您可以使用模拟框架模拟与数据库的交互，因此它可能会返回一个看起来像从数据库返回的数据集，而您然后可以测试您的代码以确保它处理将数据集转换为人员对象，而不是使用它来测试与数据库的连接是否存在.

To do this, you would normally need a dependency on the database, however with object mocking you can simulate the interaction with the database with a mock framework, so it might return a dataset which looks like one returned from the database and you can then test your code to ensure that it handles translating a dataset to a person object, rather than using it to test that a connection to the database exists.

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