[MINOR][CORE] Add test cases for RDD.cartesian #21765
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What changes were proposed in this pull request?
While looking through the codebase, it appeared that the scala code for RDD.cartesian does not have any tests for correctness. This adds a couple basic tests to verify cartesian yields correct values. While the implementation for RDD.cartesian is pretty simple, it always helps to have a few tests!
How was this patch tested?
The new test cases pass, and the scala style tests from running dev/run-tests all pass.
Please review http://spark.apache.org/contributing.html before opening a pull request.