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diff --git a/gson/src/test/java/com/google/gson/OverrideCoreTypeAdaptersTest.java b/gson/src/test/java/com/google/gson/OverrideCoreTypeAdaptersTest.java
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@@ -0,0 +1,77 @@
+/*
+ * 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.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
+import java.io.IOException;
+import java.util.Locale;
+import junit.framework.TestCase;
+
+/**
+ * @author Jesse Wilson
+ */
+public class OverrideCoreTypeAdaptersTest extends TestCase {
+  private static final TypeAdapter<Boolean> booleanAsIntAdapter = new TypeAdapter<Boolean>() {
+    @Override public void write(JsonWriter out, Boolean value) throws IOException {
+      out.value(value ? 1 : 0);
+    }
+    @Override public Boolean read(JsonReader in) throws IOException {
+      int value = in.nextInt();
+      return value != 0;
+    }
+  };
+
+  private static final TypeAdapter<String> swapCaseStringAdapter = new TypeAdapter<String>() {
+    @Override public void write(JsonWriter out, String value) throws IOException {
+      out.value(value.toUpperCase(Locale.US));
+    }
+    @Override public String read(JsonReader in) throws IOException {
+      return in.nextString().toLowerCase(Locale.US);
+    }
+  };
+
+  public void testOverrideWrapperBooleanAdapter() {
+    Gson gson = new GsonBuilder()
+        .registerTypeAdapter(Boolean.class, booleanAsIntAdapter)
+        .create();
+    assertEquals("true", gson.toJson(true, boolean.class));
+    assertEquals("1", gson.toJson(true, Boolean.class));
+    assertEquals(Boolean.TRUE, gson.fromJson("true", boolean.class));
+    assertEquals(Boolean.TRUE, gson.fromJson("1", Boolean.class));
+    assertEquals(Boolean.FALSE, gson.fromJson("0", Boolean.class));
+  }
+
+  public void testOverridePrimitiveBooleanAdapter() {
+    Gson gson = new GsonBuilder()
+        .registerTypeAdapter(boolean.class, booleanAsIntAdapter)
+        .create();
+    assertEquals("1", gson.toJson(true, boolean.class));
+    assertEquals("true", gson.toJson(true, Boolean.class));
+    assertEquals(Boolean.TRUE, gson.fromJson("1", boolean.class));
+    assertEquals(Boolean.TRUE, gson.fromJson("true", Boolean.class));
+    assertEquals("0", gson.toJson(false, boolean.class));
+  }
+
+  public void testOverrideStringAdapter() {
+    Gson gson = new GsonBuilder()
+        .registerTypeAdapter(String.class, swapCaseStringAdapter)
+        .create();
+    assertEquals("\"HELLO\"", gson.toJson("Hello", String.class));
+    assertEquals("hello", gson.fromJson("\"Hello\"", String.class));
+  }
+}