Add test for generic functionality, add description to README

1 files changed, 20 insertions, 3 deletions

diff --git a/src/test/scala/cc/spray/json/ProductFormatsSpec.scala b/src/test/scala/cc/spray/json/ProductFormatsSpec.scala
index 09b188e..edd2481 100644
--- a/src/test/scala/cc/spray/json/ProductFormatsSpec.scala
+++ b/src/test/scala/cc/spray/json/ProductFormatsSpec.scala
@@ -5,9 +5,12 @@ import org.specs2.mutable._
 class ProductFormatsSpec extends Specification with DefaultJsonProtocol {
 
   case class Test2(a: Int, b: Double)
-  implicit val test2Format = jsonFormat(Test2, "a", "b") 
+  implicit val test2Format = jsonFormat(Test2, "a", "b")
+
+  case class Test3[A, B](as: List[A], bs: List[B])
+  implicit def test3Format[A: JsonFormat, B: JsonFormat] = jsonFormat(Test3.apply[A, B], "as", "bs")
   
-  "A JsonFormat created with format, for a case class with 2 elements," should {
+  "A JsonFormat created with `jsonFormat`, for a case class with 2 elements," should {
     val obj = Test2(42, 4.2)
     val json = JsObject(JsField("a", 42), JsField("b", 4.2))
     "convert to a respective JsObject" in {
@@ -27,5 +30,19 @@ class ProductFormatsSpec extends Specification with DefaultJsonProtocol {
       JsNull.fromJson[Test2] must throwA(new DeserializationException("Object expected"))  
     )
   }
-  
+
+  "A JsonFormat for a generic case class and created with `jsonFormat`" should {
+    val obj = Test3(42 :: 43 :: Nil, "x" :: "y" :: "z" :: Nil)
+    val json = JsObject(
+      JsField("as", JsArray(JsNumber(42), JsNumber(43))),
+      JsField("bs", JsArray(JsString("x"), JsString("y"), JsString("z")))
+    )
+    "convert to a respective JsObject" in {
+      obj.toJson mustEqual json
+    }
+    "convert a JsObject to the respective case class instance" in {
+      json.fromJson[Test3[Int, String]] mustEqual obj
+    }
+  }
+
 }