This document discusses migrating test reports from Extent Reports version 3 to version 4. It provides code snippets for setting up Extent Reports version 4 to generate test reports, collect test results during test execution, and flush and rename the final report. Some key steps include initializing an ExtentSparkReporter and ExtentReports instance, creating test nodes, logging results to the report, and flushing and renaming the report on completion. Screenshots of the generated HTML report are also included.