Circe encoding seems broken

[Fabio Tiriticco]

scala 2.13.1
circe 0.12.3
enumeratum 1.5.15
enumeratumCirce 1.5.23
sbt 1.3.9
intellij idea 2020.1

It seems to me that automatic serialization of enums is broken.

class SerializationTest extends AnyWordSpec with Matchers {

  import enumeratum._

  sealed trait TestEnum extends EnumEntry

  case object TestEnum extends Enum[TestEnum] with CirceEnum[TestEnum] {
    case object ValueOne extends TestEnum
    case object ValueTwo extends TestEnum
    val values: IndexedSeq[TestEnum] = findValues
  }

  "An enum" should {
    "Be encoded correctly" in {
      val value = TestEnum.ValueOne
      val json = value.asJson
      json shouldBe "ValueOne"
    }
  }
}

This test will fail and json will be {\n \n}. Would be awesome if someone can validate this behaviour.

[Fabio Tiriticco]

Interestingly, if I add to the above

case class A(ac: TestEnum)

// and later in the test
val a = A(TestEnum.ValueTwo)
val jsonAStr = a.asJson.noSpaces // works! {"ac":"ValueTwo"}

The value of ac is rendered properly.

[Lloyd]

Can you create a Scastie reproducing this ? https://scastie.scala-lang.org

[Fabio Tiriticco]

Thanks for looking at this. I've been trying to use scastie but I am unable to find circe-generic or circe-core in the libraries or even enumeratum 😕 ScalaFiddle doesn't support enumeratum. If you have any tips, I'm happy to follow.

[Lloyd]

In Build Settings, you can fully customise the build by adding the following under Extra Sbt Configuration

libraryDependencies ++= Seq(
  "io.circe"      %% "circe-generic" % circeVersion
)

[Fabio Tiriticco]

Ah thanks @lloydmeta I missed that. I created one here:
https://scastie.scala-lang.org/ticofab/pWtlzYblQtKLTQ7IalRUhw/3

[Lloyd]

I think this is a combination of:

1. Using the member directly, causing it to resolve the object type (ValueOne.type): using a type annotation fixes this
2. Using the auto codec derivation

Here is a fixed version: https://scastie.scala-lang.org/lloydmeta/1ZP27Mb9TWy4OP77goDQnA

[Fabio Tiriticco]

Thanks for checking @lloydmeta . I tried again with my version, the only thing I had to change to make it work was adding the type explicitly: val value: TestEnum = TestEnum.ValueOne instead of val value = TestEnum.ValueOne. I'm not sure what you want to do with this issue -- it can probably be closed but I leave this to you :) Cheers.