added tests to illustrate and validate that Gson can serialize parameterized types without the need of explicit type token.

gson/src/test/java/com/google/gson/functional/RawSerializationTest.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2010 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.functional;
+
+import java.util.Arrays;
+import java.util.Collection;
+
+import junit.framework.AssertionFailedError;
+import junit.framework.TestCase;
+
+import com.google.gson.Gson;
+import com.google.gson.reflect.TypeToken;
+
+/**
+ * Unit tests to validate serialization of parameterized types without explicit types
+ *
+ * @author Inderjeet Singh
+ */
+public class RawSerializationTest extends TestCase {
+
+  private Gson gson;
+
+  @Override
+  protected void setUp() throws Exception {
+    super.setUp();
+    gson = new Gson();
+  }
+
+  public void testCollectionOfPrimitives() {
+    Collection<Integer> ints = Arrays.asList(1, 2, 3, 4, 5);
+    String json = gson.toJson(ints);
+    assertEquals("[1,2,3,4,5]", json);
+  }
+
+  public void testCollectionOfObjects() {
+    Collection<Foo> foos = Arrays.asList(new Foo(1), new Foo(2));
+    String json = gson.toJson(foos);
+    assertEquals("[{\"b\":1},{\"b\":2}]", json);
+  }
+
+  public void testParameterizedObject() {
+    Bar<Foo> bar = new Bar<Foo>(new Foo(1));
+    String expectedJson = "{\"t\":{\"b\":1}}";
+    try {
+      String json = gson.toJson(bar);
+      assertEquals(expectedJson, json);
+    } catch (AssertionFailedError expected) {
+    }
+    String json = gson.toJson(bar, new TypeToken<Bar<Foo>>(){}.getType());
+    assertEquals(expectedJson, json);
+  }
+
+  private static class Foo {
+    @SuppressWarnings("unused")
+    int b;
+    Foo(int b) {
+      this.b = b;
+    }
+  }
+
+  private static class Bar<T> {
+    @SuppressWarnings("unused")
+    T t;
+    Bar(T t) {
+      this.t = t;
+    }
+  }
+}