diff --git a/gson/src/test/java/com/google/gson/functional/TypeVariableTest.java b/gson/src/test/java/com/google/gson/functional/TypeVariableTest.java
index 75007776..2d7503eb 100644
--- a/gson/src/test/java/com/google/gson/functional/TypeVariableTest.java
+++ b/gson/src/test/java/com/google/gson/functional/TypeVariableTest.java
@@ -17,6 +17,9 @@ package com.google.gson.functional;
 
 import com.google.gson.Gson;
 
+import com.google.gson.reflect.TypeToken;
+import java.lang.reflect.Type;
+import java.util.Arrays;
 import junit.framework.TestCase;
 
 import java.util.ArrayList;
@@ -32,7 +35,7 @@ import java.util.Map;
  */
 public class TypeVariableTest extends TestCase {
 
-  public void disabled_testAdvancedTypeVariables() throws Exception {
+  public void testAdvancedTypeVariables() throws Exception {
     Gson gson = new Gson();
     Bar bar1 = new Bar("someString", 1, true);
     ArrayList<Integer> arrayList = new ArrayList<Integer>();
@@ -47,6 +50,17 @@ public class TypeVariableTest extends TestCase {
     assertEquals(bar1, bar2);
   }
 
+  public void testTypeVariablesViaTypeParameter() throws Exception {
+    Gson gson = new Gson();
+    Foo<String, Integer> original = new Foo<String, Integer>("e", 5, false);
+    original.map.put("f", Arrays.asList(6, 7));
+    Type type = new TypeToken<Foo<String, Integer>>() {}.getType();
+    String json = gson.toJson(original, type);
+    assertEquals("{\"someSField\":\"e\",\"someTField\":5,\"map\":{\"f\":[6,7]},\"redField\":false}",
+        json);
+    assertEquals(original, gson.<Foo<String, Integer>>fromJson(json, type));
+  }
+
   public void testBasicTypeVariables() throws Exception {
     Gson gson = new Gson();
     Blue blue1 = new Blue(true);
@@ -77,7 +91,9 @@ public class TypeVariableTest extends TestCase {
   }
 
   public static class Red<S> {
-    protected final S redField;
+    protected S redField;
+
+    public Red() {}
 
     public Red(S redField) {
       this.redField = redField;
@@ -85,10 +101,12 @@ public class TypeVariableTest extends TestCase {
   }
 
   public static class Foo<S, T> extends Red<Boolean> {
-    private final S someSField;
-    private final T someTField;
+    private S someSField;
+    private T someTField;
     public final Map<S, List<T>> map = new HashMap<S, List<T>>();
 
+    public Foo() {}
+
     public Foo(S sValue, T tValue, Boolean redField) {
       super(redField);
       this.someSField = sValue;