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diff --git a/shared/src/test/scala/spray/json/CollectionFormatsSpec.scala b/shared/src/test/scala/spray/json/CollectionFormatsSpec.scala
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+++ b/shared/src/test/scala/spray/json/CollectionFormatsSpec.scala
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+/*
+ * 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._
+import java.util.Arrays
+
+class CollectionFormatsSpec extends Specification with DefaultJsonProtocol {
+
+  "The listFormat" should {
+    val list = List(1, 2, 3)
+    val json = JsArray(JsNumber(1), JsNumber(2), JsNumber(3))
+    "convert a List[Int] to a JsArray of JsNumbers" in {
+      list.toJson mustEqual json
+    }
+    "convert a JsArray of JsNumbers to a List[Int]" in {
+      json.convertTo[List[Int]] mustEqual list
+    }
+  }
+  
+  "The arrayFormat" should {
+    val array = Array(1, 2, 3)
+    val json = JsArray(JsNumber(1), JsNumber(2), JsNumber(3))
+    "convert an Array[Int] to a JsArray of JsNumbers" in {
+      array.toJson mustEqual json
+    }
+    "convert a JsArray of JsNumbers to an Array[Int]" in {
+      Arrays.equals(json.convertTo[Array[Int]], array) must beTrue
+    }
+  }
+  
+  "The mapFormat" should {
+    val map = Map("a" -> 1, "b" -> 2, "c" -> 3)
+    val json = JsObject("a" -> JsNumber(1), "b" -> JsNumber(2), "c" -> JsNumber(3))
+    "convert a Map[String, Long] to a JsObject" in {
+      map.toJson mustEqual json
+    }
+    "be able to convert a JsObject to a Map[String, Long]" in {
+      json.convertTo[Map[String, Long]] mustEqual map
+    }
+    "throw an Exception when trying to serialize a map whose key are not serialized to JsStrings" in {
+      Map(1 -> "a").toJson must throwA(new SerializationException("Map key must be formatted as JsString, not '1'"))
+    }
+  }
+  
+  "The immutableSetFormat" should {
+    val set = Set(1, 2, 3)
+    val numbers = Set(JsNumber(1), JsNumber(2), JsNumber(3))
+    "convert a Set[Int] to a JsArray of JsNumbers" in {
+      set.toJson.asInstanceOf[JsArray].elements.toSet mustEqual numbers
+    }
+    "convert a JsArray of JsNumbers to a Set[Int]" in {
+      JsArray(numbers.toVector).convertTo[Set[Int]] mustEqual set
+    }
+  }
+
+  "The indexedSeqFormat" should {
+    val seq = collection.IndexedSeq(1, 2, 3)
+    val json = JsArray(JsNumber(1), JsNumber(2), JsNumber(3))
+    "convert a Set[Int] to a JsArray of JsNumbers" in {
+      seq.toJson mustEqual json
+    }
+    "convert a JsArray of JsNumbers to a IndexedSeq[Int]" in {
+      json.convertTo[collection.IndexedSeq[Int]] mustEqual seq
+    }
+  }
+  
+}
+\ No newline at end of file