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Test Plan

The new code should, of course, be tested by unti unit tests and integration tests as well as end-to-end tests. The most important acceptance test is whether we can execute a bounded DataStream program with multiple stages (keyBy()) on a single TaskManager with a single task slot. This is semething something that is not possible in STREAMING mode because all tasks/operations need to be online at the same time but is something that will be possible in BATCH execution mode.

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