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diff --git a/shared/src/test/scala/spray/json/BasicFormatsSpec.scala b/shared/src/test/scala/spray/json/BasicFormatsSpec.scala
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+++ b/shared/src/test/scala/spray/json/BasicFormatsSpec.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._
+
+class BasicFormatsSpec extends Specification with DefaultJsonProtocol {
+
+  "The IntJsonFormat" should {
+    "convert an Int to a JsNumber" in {
+      42.toJson mustEqual JsNumber(42)
+    }
+    "convert a JsNumber to an Int" in {
+      JsNumber(42).convertTo[Int] mustEqual 42
+    }
+  }
+  
+  "The LongJsonFormat" should {
+    "convert a Long to a JsNumber" in {
+      7563661897011259335L.toJson mustEqual JsNumber(7563661897011259335L)
+    }
+    "convert a JsNumber to a Long" in {
+      JsNumber(7563661897011259335L).convertTo[Long] mustEqual 7563661897011259335L
+    }
+  }
+  
+  "The FloatJsonFormat" should {
+    "convert a Float to a JsNumber" in {
+      4.2f.toJson mustEqual JsNumber(4.2f)
+    }
+    "convert a Float.NaN to a JsNull" in {
+      Float.NaN.toJson mustEqual JsNull
+    }
+    "convert a Float.PositiveInfinity to a JsNull" in {
+      Float.PositiveInfinity.toJson mustEqual JsNull
+    }
+    "convert a Float.NegativeInfinity to a JsNull" in {
+      Float.NegativeInfinity.toJson mustEqual JsNull
+    }
+    "convert a JsNumber to a Float" in {
+      JsNumber(4.2f).convertTo[Float] mustEqual 4.2f
+    }
+    "convert a JsNull to a Float" in {
+      JsNull.convertTo[Float].isNaN mustEqual Float.NaN.isNaN
+    }
+  }
+  
+  "The DoubleJsonFormat" should {
+    "convert a Double to a JsNumber" in {
+      4.2.toJson mustEqual JsNumber(4.2)
+    }
+    "convert a Double.NaN to a JsNull" in {
+      Double.NaN.toJson mustEqual JsNull
+    }
+    "convert a Double.PositiveInfinity to a JsNull" in {
+      Double.PositiveInfinity.toJson mustEqual JsNull
+    }
+    "convert a Double.NegativeInfinity to a JsNull" in {
+      Double.NegativeInfinity.toJson mustEqual JsNull
+    }
+    "convert a JsNumber to a Double" in {
+      JsNumber(4.2).convertTo[Double] mustEqual 4.2
+    }
+    "convert a JsNull to a Double" in {
+      JsNull.convertTo[Double].isNaN mustEqual Double.NaN.isNaN
+    }
+  }
+  
+  "The ByteJsonFormat" should {
+    "convert a Byte to a JsNumber" in {
+      42.asInstanceOf[Byte].toJson mustEqual JsNumber(42)
+    }
+    "convert a JsNumber to a Byte" in {
+      JsNumber(42).convertTo[Byte] mustEqual 42
+    }
+  }
+  
+  "The ShortJsonFormat" should {
+    "convert a Short to a JsNumber" in {
+      42.asInstanceOf[Short].toJson mustEqual JsNumber(42)
+    }
+    "convert a JsNumber to a Short" in {
+      JsNumber(42).convertTo[Short] mustEqual 42
+    }
+  }
+  
+  "The BigDecimalJsonFormat" should {
+    "convert a BigDecimal to a JsNumber" in {
+      BigDecimal(42).toJson mustEqual JsNumber(42)
+    }
+    "convert a JsNumber to a BigDecimal" in {
+      JsNumber(42).convertTo[BigDecimal] mustEqual BigDecimal(42)
+    }
+    """convert a JsString to a BigDecimal (to allow the quoted-large-numbers pattern)""" in {
+      JsString("9223372036854775809").convertTo[BigDecimal] mustEqual BigDecimal("9223372036854775809")
+    }
+  }
+  
+  "The BigIntJsonFormat" should {
+    "convert a BigInt to a JsNumber" in {
+      BigInt(42).toJson mustEqual JsNumber(42)
+    }
+    "convert a JsNumber to a BigInt" in {
+      JsNumber(42).convertTo[BigInt] mustEqual BigInt(42)
+    }
+    """convert a JsString to a BigInt (to allow the quoted-large-numbers pattern)""" in {
+      JsString("9223372036854775809").convertTo[BigInt] mustEqual BigInt("9223372036854775809")
+    }
+  }
+  
+  "The UnitJsonFormat" should {
+    "convert Unit to a JsNumber(1)" in {
+      ().toJson mustEqual JsNumber(1)
+    }
+    "convert a JsNumber to Unit" in {
+      JsNumber(1).convertTo[Unit] mustEqual (())
+    }
+  }
+  
+  "The BooleanJsonFormat" should {
+    "convert true to a JsTrue" in { true.toJson mustEqual JsTrue }
+    "convert false to a JsFalse" in { false.toJson mustEqual JsFalse }
+    "convert a JsTrue to true" in { JsTrue.convertTo[Boolean] mustEqual true }
+    "convert a JsFalse to false" in { JsFalse.convertTo[Boolean] mustEqual false }
+  }
+  
+  "The CharJsonFormat" should {
+    "convert a Char to a JsString" in {
+      'c'.toJson mustEqual JsString("c")
+    }
+    "convert a JsString to a Char" in {
+      JsString("c").convertTo[Char] mustEqual 'c'
+    }
+  }
+  
+  "The StringJsonFormat" should {
+    "convert a String to a JsString" in {
+      "Hello".toJson mustEqual JsString("Hello")
+    }
+    "convert a JsString to a String" in {
+      JsString("Hello").convertTo[String] mustEqual "Hello"
+    }
+  }
+  
+  "The SymbolJsonFormat" should {
+    "convert a Symbol to a JsString" in {
+      Symbol("Hello").toJson mustEqual JsString("Hello")
+    }
+    "convert a JsString to a Symbol" in {
+      JsString("Hello").convertTo[Symbol] mustEqual Symbol("Hello")
+    }
+  }
+  
+}