1 files changed, 79 insertions, 0 deletions
diff --git a/shared/src/test/scala/CoproductTypeFormatTests.scala b/shared/src/test/scala/CoproductTypeFormatTests.scala
new file mode 100644
index 0000000..de73967
--- /dev/null
+++ b/shared/src/test/scala/CoproductTypeFormatTests.scala
@@ -0,0 +1,79 @@
+package spray.json
+
+import org.scalatest._
+
+class CoproductTypeFormatTests
+    extends FlatSpec
+    with FormatTests
+    with DefaultJsonProtocol
+    with DerivedFormats {
+
+  sealed trait Expr
+  case class Zero() extends Expr
+  case class Value(x: Int) extends Expr
+  case class Plus(lhs: Expr, rhs: Expr) extends Expr
+  case object One extends Expr
+
+  implicit val exprFormat: RootJsonFormat[Expr] = jsonFormat[Expr]
+
+  "No-parameter case class child" should behave like checkRoundtrip[Expr](
+    Zero(),
+    """{"type":"Zero"}"""
+  )
+
+  "Simple parameter case class child" should behave like checkRoundtrip[Expr](
+    Value(42),
+    """{"type":"Value","x":42}"""
+  )
+
+  "Nested parameter case class child" should behave like checkRoundtrip[Expr](
+    Plus(Value(42), One),
+    """{"type":"Plus","lhs":{"type":"Value","x":42},"rhs":{"type":"One"}}"""
+  )
+
+  "Case object child" should behave like checkRoundtrip[Expr](
+    One,
+    """{"type": "One"}"""
+  )
+
+  @gadt("kind")
+  sealed abstract class Keyword(`type`: String)
+  case class If(`type`: String) extends Keyword(`type`)
+
+  implicit val keywordFormat: RootJsonFormat[Keyword] = jsonFormat[Keyword]
+
+  "GADT with type field alias" should behave like checkRoundtrip[Keyword](
+    If("class"),
+    """{"kind":"If","type":"class"}"""
+  )
+
+  @gadt("""_`crazy type!`"""")
+  sealed abstract trait Crazy
+  case class CrazyType() extends Crazy
+
+  implicit val crazyFormat: RootJsonFormat[Crazy] = jsonFormat[Crazy]
+
+  "GADT with special characters in type field" should behave like checkRoundtrip[
+    Crazy](
+    CrazyType(),
+    """{"_`crazy type!`\"": "CrazyType"}"""
+  )
+
+  sealed trait Enum
+  case object A extends Enum
+  case object B extends Enum
+
+  implicit val enumFormat: RootJsonFormat[Enum] = jsonFormat[Enum]
+
+  "Enum" should behave like checkRoundtrip[List[Enum]](
+    A :: B :: Nil,
+    """[{"type":"A"}, {"type":"B"}]"""
+  )
+
+  "Serializing as sealed trait and deserializing as child" should "work" in {
+    implicit val plusFormat: RootJsonFormat[Plus] = jsonFormat[Plus]
+    val expr: Expr = Plus(Value(42), Plus(Zero(), One))
+    assert(expr.toJson.convertTo[Plus] == expr)
+  }
+
+}