1 files changed, 58 insertions, 0 deletions
diff --git a/src/test/scala/CoproductTypeFormats.scala b/src/test/scala/CoproductTypeFormats.scala
new file mode 100644
index 0000000..f16e4c7
--- /dev/null
+++ b/src/test/scala/CoproductTypeFormats.scala
@@ -0,0 +1,58 @@
+package xyz.driver.json
+
+import spray.json._
+
+import org.scalatest._
+
+class CoproductTypeFormats
+    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
+
+  "No-parameter case class child" should behave like checkCoherence[Expr](
+    Zero(),
+    """{"type":"Zero"}"""
+  )
+
+  "Simple parameter case class child" should behave like checkCoherence[Expr](
+    Value(42),
+    """{"type":"Value","x":42}"""
+  )
+
+  "Nested parameter case class child" should behave like checkCoherence[Expr](
+    Plus(Value(42), Value(0)),
+    """{"type":"Plus","lhs":{"type":"Value","x":42},"rhs":{"type":"Value","x":0}}"""
+  )
+
+  // "Case object child" should behave like checkCoherence[Expr](
+  //   One,
+  //   """{"type":"One"}"""
+  // )
+
+  @gadt("kind")
+  sealed abstract class Keyword(`type`: String)
+  case class If(`type`: String) extends Keyword(`type`)
+
+  "GADT with type field alias" should behave like checkCoherence[Keyword](
+    If("class"),
+    """{"kind":"If","type":"class"}"""
+  )
+
+  @enum
+  sealed trait Enum
+  case object A extends Enum
+  case object B extends Enum
+
+  "Enum" should behave like checkCoherence[List[Enum]](
+    A :: B :: Nil,
+    """["A", "B"]"""
+  )
+
+}