Mix-in that sets Spark serialization to Java.
Base for test-suites that rely on Kryo serialization, including registering classes for serialization in a test-suite-scoped manner.
Base for test-suites that expose a fresh SparkContext for each test-case.
Mix-in that exposes a Spark org.apache.spark.serializer.Serializer instance.
Base for test suites that use a org.apache.spark.SparkContext.
Base for tests that initialize SparkConfs (and org.apache.spark.SparkContexts, though that is left to subclasses).