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diff --git a/java/com/google/gerrit/testing/FakeEmailSender.java b/java/com/google/gerrit/testing/FakeEmailSender.java
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+// Copyright (C) 2015 The Android Open Source Project
+//
+// 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.gerrit.testing;
+
+import static java.util.stream.Collectors.toList;
+
+import com.google.auto.value.AutoValue;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.flogger.FluentLogger;
+import com.google.gerrit.common.Nullable;
+import com.google.gerrit.common.errors.EmailException;
+import com.google.gerrit.mail.Address;
+import com.google.gerrit.mail.EmailHeader;
+import com.google.gerrit.mail.MailHeader;
+import com.google.gerrit.server.git.WorkQueue;
+import com.google.gerrit.server.mail.send.EmailSender;
+import com.google.inject.AbstractModule;
+import com.google.inject.Inject;
+import com.google.inject.Singleton;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ExecutionException;
+
+/**
+ * Email sender implementation that records messages in memory.
+ *
+ * <p>This class is mostly threadsafe. The only exception is that not all {@link EmailHeader}
+ * subclasses are immutable. In particular, if a caller holds a reference to an {@code AddressList}
+ * and mutates it after sending, the message returned by {@link #getMessages()} may or may not
+ * reflect mutations.
+ */
+@Singleton
+public class FakeEmailSender implements EmailSender {
+  private static final FluentLogger logger = FluentLogger.forEnclosingClass();
+
+  public static class Module extends AbstractModule {
+    @Override
+    public void configure() {
+      bind(EmailSender.class).to(FakeEmailSender.class);
+    }
+  }
+
+  @AutoValue
+  public abstract static class Message {
+    private static Message create(
+        Address from,
+        Collection<Address> rcpt,
+        Map<String, EmailHeader> headers,
+        String body,
+        String htmlBody) {
+      return new AutoValue_FakeEmailSender_Message(
+          from, ImmutableList.copyOf(rcpt), ImmutableMap.copyOf(headers), body, htmlBody);
+    }
+
+    public abstract Address from();
+
+    public abstract ImmutableList<Address> rcpt();
+
+    public abstract ImmutableMap<String, EmailHeader> headers();
+
+    public abstract String body();
+
+    @Nullable
+    public abstract String htmlBody();
+  }
+
+  private final WorkQueue workQueue;
+  private final List<Message> messages;
+  private int messagesRead;
+
+  @Inject
+  FakeEmailSender(WorkQueue workQueue) {
+    this.workQueue = workQueue;
+    messages = Collections.synchronizedList(new ArrayList<Message>());
+    messagesRead = 0;
+  }
+
+  @Override
+  public boolean isEnabled() {
+    return true;
+  }
+
+  @Override
+  public boolean canEmail(String address) {
+    return true;
+  }
+
+  @Override
+  public void send(
+      Address from, Collection<Address> rcpt, Map<String, EmailHeader> headers, String body)
+      throws EmailException {
+    send(from, rcpt, headers, body, null);
+  }
+
+  @Override
+  public void send(
+      Address from,
+      Collection<Address> rcpt,
+      Map<String, EmailHeader> headers,
+      String body,
+      String htmlBody)
+      throws EmailException {
+    messages.add(Message.create(from, rcpt, headers, body, htmlBody));
+  }
+
+  public void clear() {
+    waitForEmails();
+    synchronized (messages) {
+      messages.clear();
+      messagesRead = 0;
+    }
+  }
+
+  public synchronized @Nullable Message peekMessage() {
+    if (messagesRead >= messages.size()) {
+      return null;
+    }
+    return messages.get(messagesRead);
+  }
+
+  public synchronized @Nullable Message nextMessage() {
+    Message msg = peekMessage();
+    messagesRead++;
+    return msg;
+  }
+
+  public ImmutableList<Message> getMessages() {
+    waitForEmails();
+    synchronized (messages) {
+      return ImmutableList.copyOf(messages);
+    }
+  }
+
+  public List<Message> getMessages(String changeId, String type) {
+    final String idFooter = "\n" + MailHeader.CHANGE_ID.withDelimiter() + changeId + "\n";
+    final String typeFooter = "\n" + MailHeader.MESSAGE_TYPE.withDelimiter() + type + "\n";
+    return getMessages().stream()
+        .filter(in -> in.body().contains(idFooter) && in.body().contains(typeFooter))
+        .collect(toList());
+  }
+
+  private void waitForEmails() {
+    // TODO(dborowitz): This is brittle; consider forcing emails to use
+    // a single thread in tests (tricky because most callers just use the
+    // default executor).
+    for (WorkQueue.Task<?> task : workQueue.getTasks()) {
+      if (task.toString().contains("send-email")) {
+        try {
+          task.get();
+        } catch (ExecutionException | InterruptedException e) {
+          logger.atWarning().withCause(e).log("error finishing email task");
+        }
+      }
+    }
+  }
+}