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The TestBase class included in the cdap-unit-testtest3_2.12 dependency will run programs using Spark2 and Scala 2.11. If you need to unit test a program that uses Spark3 and Scala 2.12, you must remove the cdap-unit-test artifact from your Maven test dependencies and replace it with cdap-unit-test3_2.12:
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Running Tests from an IDE
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