As indicated by the word harness, it is a collection of test drivers, software and tools used to test an application in varied environments. The test engineers thoroughly analyze the product under question using these harnesses to ensure the desired outcome. These harnesses include every little detail required to run a test, including the test cases, stubs, source file under test and more. The reasons why you should use the test harness are as listed below. It helps automate the test processes and execute test suites of test cases. It can help generate test reports associated with each test case which serves as a reference for anyone working on the project. Test harness provides support for debugging and helps the developer teams measure the code coverage at the programming level. It helps enhance the quality and efficiency of the software components and makes the applications super effective. It also helps deal with the complexities that the test engineers find challenging to stimulate These are advantages of the test harness, making it an effective tool for test engineers. You can find its use, particularly in automation and integration testing and the popular harness tools available in the market are Junit and Nunit.