 <p>NUnit version 3 will support running tests in parallel, this works good with a Selenium Grid:</p> <p>Adding the attribute to a class: <code>[Parallelizable(ParallelScope.Self)]</code> will run your tests in parallel with other test classes.</p> <blockquote> <p>• ParallelScope.None indicates that the test may not be run in parallel with other tests. </p> <p>• ParallelScope.Self indicates that the test itself may be run in parallel with other tests.</p> <p>• ParallelScope.Children indicates that the descendants of the test may be run in parallel with respect to one another.</p> <p>• ParallelScope.Fixtures indicates that fixtures may be run in parallel with one another.</p> </blockquote> <p><a href="https://github.com/nunit/docs/wiki/Parallel-Test-Execution" rel="nofollow noreferrer">NUnit Framework-Parallel-Test-Execution</a></p>