Harness in a literal sense is a gear that is used to take control of something. In software testing, it is none different. In testing terms, It refers to a collection of software, test drivers, test data and other supporting tools that are constructed to test an application by executing it under different environments and analyzing its results. It uses test libraries to execute tests and generate a report.
A test harness in layman language is to make automation framework and use its constituent elements to take charge of the testing activity to get the best results.
Contexts where Test Harness is used
1. Test Harness in Test Automation
Test harness in automation testing refers to the software systems and the framework that includes test data, test scripts, test results and compares them and analyze the results.
For example, if you use any testing tool for functional testing, it organizes and manages all the test data, scripts, runs, and results. The test harness for it will be:
2. Test Harness in Integration Testing
Integration testing is testing whether the combined behavior of two or more integrated code is as expected or not.
In an Ideal scenario, Integration testing of two modules is possible when both of them are 100% ready, unit tested and good to go.
But, this everything can’t be perfect at all times. And we might land up in a situation where above conditions are not fulfilled. Hence we use (stubs and drivers) to overcome this situation. A stub is a proxy piece of code that substitutes the missing piece of code.
Test Harness Tools
Though there are no specific tools, it includes tools like test management tools, automation testing tools, etc. Any similar test tool can be an element of the test harness.
Since now you know a lot about test Harness, do keep an account of this when you leverage for your automation testing. Be wise in your selection and usage of test harness; it can bring huge benefits to your test automation.