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diff --git a/src/test/scala/spray/json/ProductFormatsSpec.scala b/src/test/scala/spray/json/ProductFormatsSpec.scala
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+++ b/src/test/scala/spray/json/ProductFormatsSpec.scala
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2011 Mathias Doenitz
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package spray.json
+
+import org.specs2.mutable._
+
+class ProductFormatsSpec extends Specification {
+
+  case class Test2(a: Int, b: Option[Double])
+  case class Test3[A, B](as: List[A], bs: List[B])
+
+  trait TestProtocol {
+    this: DefaultJsonProtocol =>
+    implicit val test2Format = jsonFormat2(Test2)
+    implicit def test3Format[A: JsonFormat, B: JsonFormat] = jsonFormat2(Test3.apply[A, B])
+  }
+  object TestProtocol1 extends DefaultJsonProtocol with TestProtocol
+  object TestProtocol2 extends DefaultJsonProtocol with TestProtocol with NullOptions
+
+  "A JsonFormat created with `jsonFormat`, for a case class with 2 elements," should {
+    import TestProtocol1._
+    val obj = Test2(42, Some(4.2))
+    val json = JsObject("a" -> JsNumber(42), "b" -> JsNumber(4.2))
+    "convert to a respective JsObject" in {
+      obj.toJson mustEqual json
+    }
+    "convert a JsObject to the respective case class instance" in {
+      json.convertTo[Test2] mustEqual obj
+    }
+    "throw a DeserializationException if the JsObject does not all required members" in (
+      JsObject("b" -> JsNumber(4.2)).convertTo[Test2] must
+              throwA(new DeserializationException("Object is missing required member 'a'"))
+    )
+    "not require the presence of optional fields for deserialization" in {
+      JsObject("a" -> JsNumber(42)).convertTo[Test2] mustEqual Test2(42, None)
+    }
+    "not render `None` members during serialization" in {
+      Test2(42, None).toJson mustEqual JsObject("a" -> JsNumber(42))
+    }
+    "ignore additional members during deserialization" in {
+      JsObject("a" -> JsNumber(42), "b" -> JsNumber(4.2), "c" -> JsString('no)).convertTo[Test2] mustEqual obj
+    }
+    "not depend on any specific member order for deserialization" in {
+      JsObject("b" -> JsNumber(4.2), "a" -> JsNumber(42)).convertTo[Test2] mustEqual obj
+    }
+    "throw a DeserializationException if the JsValue is not a JsObject" in (
+      JsNull.convertTo[Test2] must throwA(new DeserializationException("Object expected"))
+    )
+  }
+
+  "A JsonProtocol mixing in NullOptions" should {
+    "render `None` members to `null`" in {
+      import TestProtocol2._
+      Test2(42, None).toJson mustEqual JsObject("a" -> JsNumber(42), "b" -> JsNull)
+    }
+  }
+
+  "A JsonFormat for a generic case class and created with `jsonFormat`" should {
+    import TestProtocol1._
+    val obj = Test3(42 :: 43 :: Nil, "x" :: "y" :: "z" :: Nil)
+    val json = JsObject(
+      "as" -> JsArray(JsNumber(42), JsNumber(43)),
+      "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.convertTo[Test3[Int, String]] mustEqual obj
+    }
+  }
+
+}