4 files changed, 199 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)
+  }
+
+}
diff --git a/shared/src/test/scala/FormatTests.scala b/shared/src/test/scala/FormatTests.scala
new file mode 100644
index 0000000..0f56091
--- /dev/null
+++ b/shared/src/test/scala/FormatTests.scala
@@ -0,0 +1,19 @@
+package spray.json
+
+import org.scalatest._
+
+trait FormatTests { self: FlatSpec =>
+
+  def checkRoundtrip[A: RootJsonFormat](a: A, expectedJson: String) = {
+    it should "serialize to the expected JSON value" in {
+      val expected: JsValue = expectedJson.parseJson
+      assert(a.toJson == expected)
+    }
+
+    it should "serialize then deserialize back to itself" in {
+      val reread = a.toJson.convertTo[A]
+      assert(reread == a)
+    }
+  }
+
+}
diff --git a/shared/src/test/scala/ImplicitDerivedFormatTests.scala b/shared/src/test/scala/ImplicitDerivedFormatTests.scala
new file mode 100644
index 0000000..1d54ae9
--- /dev/null
+++ b/shared/src/test/scala/ImplicitDerivedFormatTests.scala
@@ -0,0 +1,24 @@
+package spray.json
+
+import org.scalatest._
+
+class ImplicitDerivedFormatTests
+    extends FlatSpec
+    with FormatTests
+    with ImplicitDerivedFormats
+    with DefaultJsonProtocol {
+
+  case class B(x: Int, b: String, mp: Map[String, Int])
+  case class C(b: B)
+
+  "Simple parameter product" should behave like checkRoundtrip(
+    B(42, "Hello World", Map("a" -> 1, "b" -> -1024)),
+    """{ "x": 42, "b": "Hello World", "mp": { "a": 1, "b": -1024 } }"""
+  )
+
+  "Nested parameter product with custom child format" should behave like checkRoundtrip(
+    C(B(42, "Hello World", Map("a" -> 1, "b" -> -1024))),
+    """{"b" :{ "x": 42, "b": "Hello World", "mp": { "a": 1, "b": -1024 } } }"""
+  )
+
+}
diff --git a/shared/src/test/scala/ProductTypeFormatTests.scala b/shared/src/test/scala/ProductTypeFormatTests.scala
new file mode 100644
index 0000000..ce05000
--- /dev/null
+++ b/shared/src/test/scala/ProductTypeFormatTests.scala
@@ -0,0 +1,77 @@
+package spray.json
+
+import org.scalatest._
+
+class ProductTypeFormatTests
+    extends FlatSpec
+    with FormatTests
+    with DerivedFormats
+    with DefaultJsonProtocol {
+
+  case class A()
+  case class B(x: Int, b: String, mp: Map[String, Int])
+  case class C(b: B)
+  case object D
+  case class E(d: D.type)
+  case class F(x: Int)
+  case class G(f: F)
+
+  implicit val aFormat: RootJsonFormat[A] = jsonFormat[A]
+  implicit val bFormat: RootJsonFormat[B] = jsonFormat[B]
+  implicit val cFormat: RootJsonFormat[C] = jsonFormat[C]
+  implicit val dFormat: RootJsonFormat[D.type] = jsonFormat[D.type]
+  implicit val eFormat: RootJsonFormat[E] = jsonFormat[E]
+
+  "No-parameter product" should behave like checkRoundtrip(A(), "{}")
+
+  "Simple parameter product" should behave like checkRoundtrip(
+    B(42, "Hello World", Map("a" -> 1, "b" -> -1024)),
+    """{ "x": 42, "b": "Hello World", "mp": { "a": 1, "b": -1024 } }"""
+  )
+
+  "Nested parameter product" should behave like checkRoundtrip(
+    C(B(42, "Hello World", Map("a" -> 1, "b" -> -1024))),
+    """{"b" :{ "x": 42, "b": "Hello World", "mp": { "a": 1, "b": -1024 } } }"""
+  )
+
+  "Case object" should behave like checkRoundtrip(
+    D,
+    "{}"
+  )
+
+  "Case object as parameter" should behave like checkRoundtrip(
+    E(D),
+    """{"d":{}}"""
+  )
+
+  // custom format for F, that inverts the value of parameter x
+  implicit val fFormat: RootJsonFormat[F] = new RootJsonFormat[F] {
+    override def write(f: F): JsValue = JsObject("y" -> f.x.toJson)
+    override def read(js: JsValue): F =
+      F(js.asJsObject.fields("y").convertTo[Int])
+  }
+
+  "Overriding with a custom format" should behave like checkRoundtrip(
+    F(2),
+    """{"y":2}"""
+  )
+
+  implicit val gFormat: RootJsonFormat[G] = jsonFormat[G]
+
+  "Derving a format with a custom child format" should behave like checkRoundtrip(
+    G(F(2)),
+    """{"f": {"y":2}}"""
+  )
+
+  case class H(x: Boolean)
+  case class I(h: H)
+
+  // there is no format defined for H, Magnolia will generate one automatically
+  implicit val iFormat: RootJsonFormat[I] = jsonFormat[I]
+
+  "Deriving a format that has no implicit child formats available" should behave like checkRoundtrip(
+    I(H(true)),
+    """{"h": {"x":true}}"""
+  )
+
+}