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diff --git a/gson/src/test/java/com/google/gson/JavaSerializationTest.java b/gson/src/test/java/com/google/gson/JavaSerializationTest.java
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+/*
+ * Copyright (C) 2012 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.reflect.TypeToken;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.lang.reflect.Type;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import junit.framework.TestCase;
+
+/**
+ * Check that Gson doesn't return non-serializable data types.
+ *
+ * @author Jesse Wilson
+ */
+public final class JavaSerializationTest extends TestCase {
+  private final Gson gson = new Gson();
+
+  public void testMapIsSerializable() throws Exception {
+    Type type = new TypeToken<Map<String, Integer>>() {}.getType();
+    Map<String, Integer> map = gson.fromJson("{\"b\":1,\"c\":2,\"a\":3}", type);
+    Map<String, Integer> serialized = serializedCopy(map);
+    assertEquals(map, serialized);
+    // Also check that the iteration order is retained.
+    assertEquals(Arrays.asList("b", "c", "a"), new ArrayList<String>(serialized.keySet()));
+  }
+
+  public void testListIsSerializable() throws Exception {
+    Type type = new TypeToken<List<String>>() {}.getType();
+    List<String> list = gson.fromJson("[\"a\",\"b\",\"c\"]", type);
+    List<String> serialized = serializedCopy(list);
+    assertEquals(list, serialized);
+  }
+
+  public void testNumberIsSerializable() throws Exception {
+    Type type = new TypeToken<List<Number>>() {}.getType();
+    List<Number> list = gson.fromJson("[1,3.14,6.673e-11]", type);
+    List<Number> serialized = serializedCopy(list);
+    assertEquals(1.0, serialized.get(0).doubleValue());
+    assertEquals(3.14, serialized.get(1).doubleValue());
+    assertEquals(6.673e-11, serialized.get(2).doubleValue());
+  }
+
+  @SuppressWarnings("unchecked") // Serialization promises to return the same type.
+  private <T> T serializedCopy(T object) throws IOException, ClassNotFoundException {
+    ByteArrayOutputStream bytesOut = new ByteArrayOutputStream();
+    ObjectOutputStream out = new ObjectOutputStream(bytesOut);
+    out.writeObject(object);
+    out.close();
+    ByteArrayInputStream bytesIn = new ByteArrayInputStream(bytesOut.toByteArray());
+    ObjectInputStream in = new ObjectInputStream(bytesIn);
+    return (T) in.readObject();
+  }
+}