Xcode单元测试 [英] Xcode unit testing

问题描述

我从未使用过单元测试，我理解它的用途，但我真的不知道何时以及如何使用它。

I have never used Unit Testing and I understand the uses of it but I don't really know when and how to use it.

我想知道当值得使用单元测试时，也许有一些例子。

I would like to know when it's worth it to use Unit Testing, maybe with some examples.

推荐答案

你几乎应该总是单元测试，你应该编写代码考虑单元测试。
极端分子甚至在编写代码之前编写测试（称为TDD - 测试驱动开发）。

You should almost always unit test and you should write code with unit tests in mind. The extremists write tests even before writing the code (it's called TDD - Test Driven Development).

我会给你一个真实的例子：我最近必须编写一个支持间隔的已排序的NSArray。意思是，数组应该知道如何插入一个区间并保持它的排序。

I'll give you a real life example: I recently had to code a sorted NSArray that supports "intervals". Meaning, the array should know how to insert an interval and keep it sorted.

例如，数组看起来像这样：[1-3,5-9， 12-50]。在此示例中，数组中有3个区间，您可以看到它们已排序。
在我写完课程后（我称之为IntervalsArray），我 HAD 编写测试以确保它正常工作，并且如果我或其他人制作我不会破坏它将来对代码的更改。

For example, the array would look like this: [1-3, 5-9, 12-50]. In this example there are 3 intervals in the array, and as you can see they are sorted. After I wrote my class (I called it IntervalsArray), I HAD to write tests to make sure that it works correctly and that I will not "break" it if I or someone else make changes to the code in the future.

以下是一些示例测试（伪代码）：

Here are some example tests (pseudo-code):

测试1：

- Create a new IntervalsArray
- Insert a new interval to the array
- (TEST) make sure the array has 1 object in it

测试2：

- Create a new IntervalsArray
- Insert 2 intervals into the array: [1-3] and [5-9]
- (TEST) make sure there are 2 items in the array
- (TEST) make sure interval [1-3] comes before interval [5-9]

最后我有15个测试来覆盖我新阵列的各个方面。

At the end I had something like 15 tests to cover every aspect of my new array.

这是一个< a href =http://www.impigermobile.com/blog/introduction-to-xcode-unit-testing-in-ios/ =noreferrer>好单位 - 使用Xcode教程进行测试。

您还可以编写逻辑测试（比单元测试更复杂）来测试UI。阅读一下UIAutomation，这是Apple测试UI的方式。它并不完美，但它非常好。 这是一篇很好的教程。

You can also write logic tests (which are more complicated than unit tests) to test your UI. Read a little about UIAutomation, which is Apple's way of testing UI. It's not perfect, but it's pretty good. Here's an excellent tutorial about this.

如果你认为自己是一名优秀的程序员，你应该为你的代码编写单元测试。

If you consider yourself a good programmer, you should write unit-tests for your code.

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