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diff --git a/gson/src/test/java/com/google/gson/ParameterizedTypeFixtures.java b/gson/src/test/java/com/google/gson/ParameterizedTypeFixtures.java
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+/*
+ * Copyright (C) 2008 Google Inc.
+ *
+ * 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 com.google.gson;
+
+import com.google.gson.internal.$Gson$Types;
+
+import com.google.gson.internal.Primitives;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.lang.reflect.ParameterizedType;
+import java.lang.reflect.Type;
+
+
+/**
+ * This class contains some test fixtures for Parameterized types. These classes should ideally
+ * belong either in the common or functional package, but they are placed here because they need
+ * access to package protected elements of com.google.gson.
+ *
+ * @author Inderjeet Singh
+ * @author Joel Leitch
+ */
+public class ParameterizedTypeFixtures {
+
+  public static class MyParameterizedType<T> {
+    public final T value;
+    public MyParameterizedType(T value) {
+      this.value = value;
+    }
+    public T getValue() {
+      return value;
+    }
+
+    public String getExpectedJson() {
+      String valueAsJson = getExpectedJson(value);
+      return String.format("{\"value\":%s}", valueAsJson);
+    }
+
+    private String getExpectedJson(Object obj) {
+      Class<?> clazz = obj.getClass();
+      if (Primitives.isWrapperType(Primitives.wrap(clazz))) {
+        return obj.toString();
+      } else if (obj.getClass().equals(String.class)) {
+        return "\"" + obj.toString() + "\"";
+      } else {
+        // Try invoking a getExpectedJson() method if it exists
+        try {
+          Method method = clazz.getMethod("getExpectedJson");
+          Object results = method.invoke(obj);
+          return (String) results;
+        } catch (SecurityException e) {
+          throw new RuntimeException(e);
+        } catch (NoSuchMethodException e) {
+          throw new RuntimeException(e);
+        } catch (IllegalArgumentException e) {
+          throw new RuntimeException(e);
+        } catch (IllegalAccessException e) {
+          throw new RuntimeException(e);
+        } catch (InvocationTargetException e) {
+          throw new RuntimeException(e);
+        }
+      }
+    }
+
+    @Override
+    public int hashCode() {
+      return value == null ? 0 : value.hashCode();
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public boolean equals(Object obj) {
+      if (this == obj) {
+        return true;
+      }
+      if (obj == null) {
+        return false;
+      }
+      if (getClass() != obj.getClass()) {
+        return false;
+      }
+      MyParameterizedType<T> other = (MyParameterizedType<T>) obj;
+      if (value == null) {
+        if (other.value != null) {
+          return false;
+        }
+      } else if (!value.equals(other.value)) {
+        return false;
+      }
+      return true;
+    }
+  }
+
+  public static class MyParameterizedTypeInstanceCreator<T>
+      implements InstanceCreator<MyParameterizedType<T>>{
+    private final T instanceOfT;
+    /**
+     * Caution the specified instance is reused by the instance creator for each call.
+     * This means that the fields of the same objects will be overwritten by Gson.
+     * This is usually fine in tests since there we deserialize just once, but quite
+     * dangerous in practice.
+     *
+     * @param instanceOfT
+     */
+    public MyParameterizedTypeInstanceCreator(T instanceOfT) {
+      this.instanceOfT = instanceOfT;
+    }
+    public MyParameterizedType<T> createInstance(Type type) {
+      return new MyParameterizedType<T>(instanceOfT);
+    }
+  }
+
+  public static class MyParameterizedTypeAdapter<T>
+  implements JsonSerializer<MyParameterizedType<T>>, JsonDeserializer<MyParameterizedType<T>> {
+    @SuppressWarnings("unchecked")
+    public static<T> String getExpectedJson(MyParameterizedType<T> obj) {
+      Class<T> clazz = (Class<T>) obj.value.getClass();
+      boolean addQuotes = !clazz.isArray() && !Primitives.unwrap(clazz).isPrimitive();
+      StringBuilder sb = new StringBuilder("{\"");
+      sb.append(obj.value.getClass().getSimpleName()).append("\":");
+      if (addQuotes) {
+        sb.append("\"");
+      }
+      sb.append(obj.value.toString());
+      if (addQuotes) {
+        sb.append("\"");
+      }
+      sb.append("}");
+      return sb.toString();
+    }
+
+    public JsonElement serialize(MyParameterizedType<T> src, Type classOfSrc,
+        JsonSerializationContext context) {
+      JsonObject json = new JsonObject();
+      T value = src.getValue();
+      json.add(value.getClass().getSimpleName(), context.serialize(value));
+      return json;
+    }
+
+    @SuppressWarnings("unchecked")
+    public MyParameterizedType<T> deserialize(JsonElement json, Type typeOfT,
+        JsonDeserializationContext context) throws JsonParseException {
+      Type genericClass = ((ParameterizedType) typeOfT).getActualTypeArguments()[0];
+      Class<?> rawType = $Gson$Types.getRawType(genericClass);
+      String className = rawType.getSimpleName();
+      JsonElement jsonElement = json.getAsJsonObject().get(className);
+
+      T value;
+      if (genericClass == Integer.class) {
+        value = (T) Integer.valueOf(jsonElement.getAsInt());
+      } else if (genericClass == String.class) {
+        value = (T) jsonElement.getAsString();
+      } else {
+        value = (T) jsonElement;
+      }
+
+      if (Primitives.isPrimitive(genericClass)) {
+        PrimitiveTypeAdapter typeAdapter = new PrimitiveTypeAdapter();
+        value = (T) typeAdapter.adaptType(value, rawType);
+      }
+      return new MyParameterizedType<T>(value);
+    }
+  }
+}