JUnit的.并行运行.但是所有测试方法都处理单例实例.怎么解决? [英] JUnit. Parallel running. But all the test methods processing singleton instance. How to solve?

问题描述

因此，我有几个JUnit类，每个类都包含一个测试方法列表. 每种方法彼此独立，没有直接连接. 但是我们有间接连接:所有方法都处理一个单例对象(它是Selenium Web Driver实例，是的，我对所有测试都使用1 Web Driver实例，因为创建新的对象实例需要花费大量时间！).

So, I have a couple of JUnit classes, each one contains a list of test methods. Each method is independent of each other, there is no direct connection. But we have indirect connection: all methods processes one singleton object (it is Selenium Web Driver Instance, yes, I use 1 Web Driver Instance for all my tests, because for making new object instance we spend a really lot of time! ).

当测试方法在一个线程中逐步执行时，这没关系.但这太长了，

And It is all ok, when test methods execute step by step in one thread. But it is too long too,

因此，我决定提高速度， 如何? -我决定以并行模式运行所有测试方法.为此，我使用具有特殊配置的maven进行并行测试执行.

So, I decided to increase speed, How? - I decided to run all the test methods in the parallel mode. For this I use maven with the special configuration for parallel test execution.

但是，我认为这是一个新问题，因为-结果我们执行了并行方法，但是我们仍然只使用单个 Web驱动程序实例.

But I think, it is a source a new problem, because - in result we have parallel methods execution, but we still work just with single Web Driver Instance.

我正在寻找最佳解决方案:

I'm trying to find the optimal solution:

我希望测试将以并行模式执行-确实非常快.

I want that the tests will be executed in parallel mode - it is really fast.

我不希望为每个测试都创建一个新对象-这是一个非常漫长的过程.

I don't want that for every test new object is created - it is a very long process.

您能为我提供什么建议?

What advice can you provide for me?

您将如何解决这个问题?

How would you have solved this problem?

推荐答案

不幸的是，webDriver不是线程安全的.恕我直言，最佳做法是使用单独的webDriver实例在单独的线程中运行每个测试类.最佳线程数是 int threadNum = Runtime.getRuntime().availableProcessors() * 2;我的项目的执行时间从30分钟减少到4分钟. 在Thucydides框架中使用的方法完全相同.

Unfortunately, webDriver is not thread-safe. Imho, best practice is to run each test class using individual webDriver instance in separate thread. The optimal number of threads is int threadNum = Runtime.getRuntime().availableProcessors() * 2; The executing time of my projects reduced from 30 minutes to 4. Exactly the same method is used in Thucydides framework.

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