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• Data Injection phase means configuring the input source for Samza job.
• Data Transformation phase means api logic of samza job(low-level/high-level). 
• Data Validation phase asserts the expected results to the actual results computed after running a Samza job.

Data Injection:

In the context of this Test framework an input stream means a stream that Samza job may consume from and an output stream means a stream that Samza job can produce to. The initial source of data stream is always supposed to be bounded since this is a test, and that may originate as one of the following sources listed below.

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