Add JSON serialization test for User model (DanielaSfregola#109)

build.sbt

@@ -19,6 +19,7 @@ libraryDependencies ++= {
   val Json4s = "3.5.0"
   val Spec2 = "3.8.6"
   val ScalaLogging = "3.5.0"
+  val RandomDataGenerator = "2.3"
 
   Seq(
     "com.typesafe" % "config" % Typesafe,
@@ -29,7 +30,8 @@ libraryDependencies ++= {
     "com.typesafe.scala-logging" %% "scala-logging" % ScalaLogging,
     "org.specs2" %% "specs2-core" % Spec2 % "test",
     "org.specs2" %% "specs2-mock" % Spec2 % "test",
-    "com.typesafe.akka" %% "akka-testkit" % Akka % "test"
+    "com.typesafe.akka" %% "akka-testkit" % Akka % "test",
+    "com.danielasfregola" %% "random-data-generator" % RandomDataGenerator % "test"
   )
 }
 

src/test/scala/com/danielasfregola/twitter4s/entities/SerializationSpec.scala

@@ -0,0 +1,54 @@
+package com.danielasfregola.twitter4s.entities
+
+import java.util.Date
+
+import com.danielasfregola.randomdatagenerator.RandomDataGenerator
+import com.danielasfregola.twitter4s.http.serializers.JsonSupport
+import org.json4s.native.Serialization
+import org.scalacheck.Gen.alphaChar
+import org.scalacheck.{Arbitrary, Gen}
+import org.specs2.mutable.Specification
+import org.specs2.specification.core.Fragment
+
+import scala.reflect._
+
+class SerializationSpec extends Specification with RandomDataGenerator with JsonSupport {
+
+  // We serialize dates to second precision
+  implicit val arbitraryDate: Arbitrary[Date] = Arbitrary {
+    for {
+      timeInMicroseconds: Long <- Gen.chooseNum(1142899200L, 1512442349L)
+    } yield {
+      new Date(timeInMicroseconds * 1000)
+    }
+  }
+
+  implicit val arbitraryProfileImage: Arbitrary[ProfileImage] = Arbitrary {
+    for {
+      prefix: String <- Gen.nonEmptyListOf(alphaChar).map(_.mkString)
+      suffix: String <- Gen.oneOf("_mini", "_normal", "_bigger", "")
+    } yield {
+      ProfileImage(s"${prefix}_$suffix.jpg")
+    }
+  }
+
+  "JSON serialization" should {
+
+    def roundtripTest[T <: AnyRef : Manifest : Arbitrary]: Fragment = {
+
+      val className = classTag[T].runtimeClass.getSimpleName
+
+      s"round-trip successfully for $className" in {
+        val randomEntity = random[T]
+
+        val serializedJson = Serialization.write[T](randomEntity)
+
+        val deserializedEntity = Serialization.read[T](serializedJson)
+
+        deserializedEntity === randomEntity
+      }
+    }
+
+    roundtripTest[User]
+  }
+}