问题描述
我使用JUnit 4.我看不到在构造函数中初始化或使用由 @Before 注释的专用init函数之间的区别。这是否意味着我不必担心它？
I'm using JUnit 4. I can't see the difference between initializing in the constructor or using a dedicated init function annotated by @Before. Does this mean that I don't have to worry about it?
有任何情况下 @Before
推荐答案
不，使用构造函数初始化您的JUnit测试夹具在技术上等于使用 @Before 方法（由于JUnit为每个 @Test 创建一个新的测试类实例）。唯一的（内涵的）区别是它打破了 @Before 和 @After 之间的对称性，一些。 IMHO最好遵守约定（使用 @Before ）。
No, using the constructor to initialize your JUnit test fixture is technically equal to using the @Before method (due to the fact that JUnit creates a new instance of the testing class for each @Test). The only (connotational) difference is that it breaks the symmetry between @Before and @After, which may be confusing for some. IMHO it is better to adhere to conventions (which is using @Before).
还要注意，在JUnit之前4和注释，有专门的 setUp（）和 tearDown（）方法 - @在和 @After 注释之前替换这些，但保留基本逻辑。因此，使用注释也使从JUnit 3或更早版本迁移的人更容易生活。
Note also that prior to JUnit 4 and annotations, there were dedicated setUp() and tearDown() methods - the @Before and @After annotations replace these, but preserve the underlying logic. So using the annotations also makes life easier for someone migrating from JUnit 3 or earlier versions.
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