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diff --git a/gson/src/test/java/com/google/gson/GsonBuilderTest.java b/gson/src/test/java/com/google/gson/GsonBuilderTest.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 java.lang.reflect.Modifier;
+import java.lang.reflect.Type;
+
+import junit.framework.TestCase;
+
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
+
+/**
+ * Unit tests for {@link GsonBuilder}.
+ *
+ * @author Inderjeet Singh
+ */
+public class GsonBuilderTest extends TestCase {
+  private static final TypeAdapter<Object> NULL_TYPE_ADAPTER = new TypeAdapter<Object>() {
+    @Override public void write(JsonWriter out, Object value) {
+      throw new AssertionError();
+    }
+    @Override public Object read(JsonReader in) {
+      throw new AssertionError();
+    }
+  };
+
+  public void testCreatingMoreThanOnce() {
+    GsonBuilder builder = new GsonBuilder();
+    builder.create();
+    builder.create();
+  }
+
+  public void testExcludeFieldsWithModifiers() {
+    Gson gson = new GsonBuilder()
+        .excludeFieldsWithModifiers(Modifier.VOLATILE, Modifier.PRIVATE)
+        .create();
+    assertEquals("{\"d\":\"d\"}", gson.toJson(new HasModifiers()));
+  }
+
+  public void testRegisterTypeAdapterForCoreType() {
+    Type[] types = {
+        byte.class,
+        int.class,
+        double.class,
+        Short.class,
+        Long.class,
+        String.class,
+    };
+    for (Type type : types) {
+      new GsonBuilder().registerTypeAdapter(type, NULL_TYPE_ADAPTER);
+    }
+  }
+
+  @SuppressWarnings("unused")
+  static class HasModifiers {
+    private String a = "a";
+    volatile String b = "b";
+    private volatile String c = "c";
+    String d = "d";
+  }
+
+  public void testTransientFieldExclusion() {
+    Gson gson = new GsonBuilder()
+        .excludeFieldsWithModifiers()
+        .create();
+    assertEquals("{\"a\":\"a\"}", gson.toJson(new HasTransients()));
+  }
+
+  static class HasTransients {
+    transient String a = "a";
+  }
+}