问题描述
是否使用新的（或不同的） TestCase 对象实例来运行JUnit测试用例中的每个测试方法？或者一个实例被重用于所有测试？
Is a new (or different) instance of TestCase object is used to run each test method in a JUnit test case? Or one instance is reused for all the tests?
public class MyTest extends TestCase {
public void testSomething() { ... }
public void testSomethingElse() { ... }
}
运行此测试时，是否创建了多少个 MyTest 类的实例？
While running this test, how many instances of MyTest class is created?
如果可能，请提供链接到我可以验证行为的文档或源代码。
If possible, provide a link to a document or source code where I can verify the behaviour.
推荐答案
我在JUnit文档中找不到明确的答案关于你的问题，但正如anjanb所写，其意图是每个测试都独立于其他测试，因此可以为每个要运行的测试创建一个新的TestCase实例。
I couldn't find a clear answer in the JUnit docs about your question, but the intent, as anjanb wrote, is that each test is independent of the others, so a new TestCase instance could be created for each test to be run.
如果您希望在测试类中的所有测试用例中共享昂贵的测试设置（ fixtures ），则可以使用 @BeforeClass 注释一个静态方法来实现这个结果：。但请注意，仍然可以为每个测试创建一个新实例，但这不会影响@BeforeTest方法初始化的静态数据。
If you have expensive test setup ("fixtures") that you want to be shared across all test cases in a test class, you can use the @BeforeClass annotation on a static method to achieve this result: http://junit.sourceforge.net/javadoc_40/org/junit/BeforeClass.html. Note however, that a new instance may still be created for each test, but that won't affect the static data your @BeforeTest method has initialized.
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