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fix ZStream.grouped #3819

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Merged
merged 1 commit into from
Jun 16, 2020
Merged

fix ZStream.grouped #3819

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9 changes: 7 additions & 2 deletions streams-tests/shared/src/test/scala/zio/stream/ZStreamSpec.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -1540,8 +1540,13 @@ object ZStreamSpec extends ZIOBaseSpec {
} yield assert(result)(equalTo(Chunk(1)))
}
),
testM("grouped")(
assertM(ZStream(1, 2, 3, 4).grouped(2).runCollect)(equalTo(Chunk(List(1, 2), List(3, 4))))
suite("grouped")(
testM("sanity") {
assertM(ZStream(1, 2, 3, 4, 5).grouped(2).runCollect)(equalTo(Chunk(List(1, 2), List(3, 4), List(5))))
},
testM("doesn't emit empty chunks") {
assertM(ZStream.fromIterable(List.empty[Int]).grouped(5).runCollect)(equalTo(Chunk.empty))
}
),
suite("groupedWithin")(
testM("group based on time passed") {
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2 changes: 1 addition & 1 deletion streams/shared/src/main/scala/zio/stream/ZStream.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -1589,7 +1589,7 @@ abstract class ZStream[-R, +E, +O](val process: ZManaged[R, Nothing, ZIO[R, Opti
* @param chunkSize size of the chunk
*/
def grouped(chunkSize: Long): ZStream[R, E, List[O]] =
aggregate(ZTransducer.collectAllN(chunkSize))
aggregate(ZTransducer.collectAllN(chunkSize)).filter(_.nonEmpty)

/**
* Partitions the stream with the specified chunkSize or until the specified
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