Kenneth Knowles reopened BEAM-3159:

> DoFnTester should be deprecated in favor of TestPipeline
> --------------------------------------------------------
>                 Key: BEAM-3159
>                 URL: https://issues.apache.org/jira/browse/BEAM-3159
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-java-core
>            Reporter: Ben Chambers
>            Assignee: Kenneth Knowles
>            Priority: Minor
>             Fix For: 2.4.0
>          Time Spent: 20m
>  Remaining Estimate: 0h
> Reasons:
> 1. The logical unit within a Beam pipeline is a transform. Either a small 
> transform like a ParDo or a larger composite transform. Unit tests should 
> focus on these units, rather than probing specific behaviors of the 
> user-defined functions.
> 2. The way that a runner interacts with a user-defined function is not 
> necessarily obvious. DoFnTester allows testing non-sensical cases that 
> wouldn't arise in practice, since it allows low-level interactions with the 
> actual UDFs.
> Instead, we should encourage the use of TestPipeline with the direct runner. 
> This allows testing a single transform (such as a ParDo running a UDF) in 
> context. It also makes it easier to test things like side-inputs and multiple 
> outputs, since you use the same techniques in the test as you would in a real 
> pipeline, rather than requiring a whole new API.

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