package spray.json
import org.scalatest._
class ProductTypeFormatTests
extends FlatSpec
with FormatTests
with DerivedJsonProtocol {
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}}"""
)
case class Typed[T](t: T)
implicit def typed[T: JsonFormat] = jsonFormat[Typed[T]]
"Class with a type parameter" should behave like checkRoundtrip(
Typed[Int](42),
"""{"t":42}"""
)
"Class with nested types" should behave like checkRoundtrip(
Typed[Typed[String]](Typed("hello world")),
"""{"t":{"t":"hello world"}}"""
)
case class Phantom[T](x: Int)
// no json format required for T
implicit def phantom[T]: RootJsonFormat[Phantom[T]] = jsonFormat[Phantom[T]]
"Phantom types without a format" should behave like checkRoundtrip(
Phantom[Int => String](42), // the given type parameter should not have a format
"""{"x":42}"""
)
implicit val vc = jsonFormat[ProductTypeFormatTests.Wrapper]
"Value classes" should behave like checkRoundtrip(
ProductTypeFormatTests.Wrapper(42),
"""42"""
)
implicit def vcg[T: JsonFormat] = jsonFormat[ProductTypeFormatTests.WrapperGeneric[T]]
"Value classes with generic parameters" should behave like checkRoundtrip(
ProductTypeFormatTests.WrapperGeneric[F](F(42)),
"""{"y": 42}"""
)
implicit def vcp[T] = jsonFormat[ProductTypeFormatTests.WrapperPhantom[T]]
"value classes with unused generic parameters" should behave like checkRoundtrip(
ProductTypeFormatTests.WrapperPhantom[Int => String](42),
"""42"""
)
}
object ProductTypeFormatTests {
case class Wrapper(x: Int) extends AnyVal
case class WrapperGeneric[A](x: A) extends AnyVal
case class WrapperPhantom[A](x: Int) extends AnyVal
}
