[play-framework] [2.0] How to test chunked results?

[Eric Jain]

I can check the response status and content type, but
Helpers.contentAsString(result) fails:

"Cannot extract the body content from a result of type
play.api.mvc.ChunkedResult"

Is there a simple way to verify the contents of chunked results in
unit tests?

[Erem Boto]

I'm coming across this same issue and also would like to know how. I am trying to read how it's done in PlayDefaultUpstreamHandler.scala, but I can't make sense of the code.

[Erem Boto]

I ended up writing the following function that returns the length of the chunked result. Should be pretty clear how you would use a mutable collection to return the content itself rather than the length, assuming you're writing a byte array like I am.

We wouldn't have to use this crufty var if chunks accepted something other than an Iteratee[A, Unit], and we wouldn't have to do the iteration if applying chunks returned a Promise[Iteratee[A, Unit]] rather than an Any.

  def chunkedContentLength(chunkedResult: ChunkedResult[Array[Byte]]): Int =  {

    var numBytes = 0

    val countIteratee = Iteratee.fold[Array[Byte], Unit](0) { (_, bytes) => numBytes += bytes.size }

    val promisedIteratee = chunkedResult.chunks(countIteratee).asInstanceOf[Promise[Iteratee[Array[Byte], Unit]]]

    promisedIteratee.await(5000).get.run.await(5000).get // waits until all the chunks have been retrieved

    

    numBytes

  }

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[Nick McCready]

This needs to be addressed in play 2.1 as well. Getting the data out of an Iteratee seems incorrect with having to use var. This should be improved ti allow an Iteratee to return something other than Unit in a ChunkedResult.