Random run order is more of a principle than a pattern. It applies to the test execution. This execution is usually performed on a Continuous Integration (CI) environment. The random run order principle states that the order of the test suite execution should be randomized every time the suite is executed. The idea is to flush out instabilities in the test suite by introducing an element of chaos. Any test that has a hidden dependency on another test will eventually fail when the test run order is random.