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In automated testing, test prioritization helps control the execution order of tests, ensuring that critical tests run first. Unlike some testing frameworks that provide built-in priority attributes, xUnit does not natively support test prioritization. However, we can achieve this by leveraging test collections, ordering features, and custom attributes.

The recommended way to control test execution order in xUnit is by implementing ITestCaseOrderer and ITestCollectionOrderer. This allows you to define a custom ordering logic for your test methods.

Step 1: Create a Custom Test Attribute

Step 2: Create a Custom Test Orderer

Step 3: Apply the Orderer in Your Test Class

Conclusion

Ideally, the order in which unit tests run should not matter, and it is best practice to avoid ordering unit tests. Regardless, there may be a need to do so.