{"id":47972,"date":"2017-06-26T11:00:47","date_gmt":"2017-06-26T08:00:47","guid":{"rendered":"http:\/\/examples.javacodegeeks.com\/?p=47972"},"modified":"2019-03-20T13:48:45","modified_gmt":"2019-03-20T11:48:45","slug":"junit-run-tests-in-parallel","status":"publish","type":"post","link":"https:\/\/examples.javacodegeeks.com\/java-development\/core-java\/junit\/junit-run-tests-in-parallel\/","title":{"rendered":"JUnit Run Tests in Parallel"},"content":{"rendered":"

In this example, we will show you the usage of JUnit while running test in parallel. We have seen lots of cases where we need to run our test cases in parallel. There might be multiple reasons for that like to run test cases in a small time or take advantage of the multi-core CPU so that all your test cases are executed fast.<\/p>\n

The reasons can be multiple. But when comes to the JUnit framework, it has its own way of dealing with the parallel test cases. We want our test cases to execute faster than when running one by one.<\/p>\n

In small examples, you will not see a significant change. But when you have a bigger application, then you have to run test cases within a specific period of time without contributing any errors.\n<\/p>\n

1. Introduction<\/h2>\n

JUnit provides an experimental class ParallelComputer<\/code>. It has various ways where we can run our test cases in parallel. We will see the detailed example below.<\/p>\n

We will analyze the methods that are used in our example. We will also see how we can achieve the parallel execution without the ParallelComputer<\/code> class.<\/p>\n

There is another way i.e. to use a surefire plugin of Maven that helps us to run the test cases in parallel. We will also see how we can achieve it. But for this example, we will concentrate on the use of the class ParallelComputer<\/code> of JUnit.<\/p>\n

2. Technologies Used<\/h2>\n

We will be using the following technologies while building an example. Here we are taking the latest version of each technology.<\/p>\n