http://git-wip-us.apache.org/repos/asf/incubator-wave/blob/314ddcc7/wave/src/test/java/org/waveprotocol/wave/model/testing/WaveletDataFactory.java
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a/wave/src/test/java/org/waveprotocol/wave/model/testing/WaveletDataFactory.java
b/wave/src/test/java/org/waveprotocol/wave/model/testing/WaveletDataFactory.java
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+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 org.waveprotocol.wave.model.testing;
+
+
+import org.waveprotocol.wave.model.id.IdGenerator;
+import org.waveprotocol.wave.model.id.WaveId;
+import org.waveprotocol.wave.model.id.WaveletId;
+import org.waveprotocol.wave.model.version.HashedVersion;
+import org.waveprotocol.wave.model.wave.ParticipantId;
+import org.waveprotocol.wave.model.wave.data.ObservableWaveletData;
+import org.waveprotocol.wave.model.wave.data.WaveletData;
+import org.waveprotocol.wave.model.wave.data.impl.EmptyWaveletSnapshot;
+
+/**
+ * Exposes any {@link ObservableWaveletData.Factory} as a {@link Factory}, by
+ * injecting suitable dependencies for testing.
+ *
+ */
+public final class WaveletDataFactory<T extends WaveletData> implements
Factory<T> {
+ private final static WaveId WAVE_ID;
+ private final static WaveletId WAVELET_ID;
+ private static final ParticipantId PARTICIPANT_ID = new
ParticipantId("f...@example.com");
+
+ static {
+ IdGenerator gen = FakeIdGenerator.create();
+ WAVE_ID = gen.newWaveId();
+ WAVELET_ID = gen.newConversationWaveletId();
+ }
+
+ private final WaveletData.Factory<T> factory;
+
+ private WaveletDataFactory(WaveletData.Factory<T> factory) {
+ this.factory = factory;
+ }
+
+ public static <T extends WaveletData> Factory<T> of(WaveletData.Factory<T>
factory) {
+ return new WaveletDataFactory<T>(factory);
+ }
+
+ @Override
+ public T create() {
+ return factory.create(new EmptyWaveletSnapshot(WAVE_ID, WAVELET_ID,
PARTICIPANT_ID,
+ HashedVersion.unsigned(0), 0));
+ }
+}
