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diff --git a/gerrit-server/src/test/java/com/google/gerrit/testutil/InMemoryDatabase.java b/gerrit-server/src/test/java/com/google/gerrit/testutil/InMemoryDatabase.java
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+++ b/gerrit-server/src/test/java/com/google/gerrit/testutil/InMemoryDatabase.java
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+// Copyright (C) 2009 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.testutil;
+
+import com.google.gerrit.reviewdb.CurrentSchemaVersion;
+import com.google.gerrit.reviewdb.ReviewDb;
+import com.google.gerrit.reviewdb.SystemConfig;
+import com.google.gerrit.server.config.SystemConfigProvider;
+import com.google.gerrit.server.schema.Current;
+import com.google.gerrit.server.schema.SchemaCreator;
+import com.google.gerrit.server.schema.SchemaVersion;
+import com.google.gwtorm.client.OrmException;
+import com.google.gwtorm.client.SchemaFactory;
+import com.google.gwtorm.jdbc.Database;
+import com.google.gwtorm.jdbc.SimpleDataSource;
+import com.google.inject.Guice;
+import com.google.inject.Key;
+import com.google.inject.Provider;
+
+import junit.framework.TestCase;
+
+import java.io.File;
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.util.Properties;
+
+import javax.sql.DataSource;
+
+/**
+ * An in-memory test instance of {@link ReviewDb} database.
+ * <p>
+ * Test classes should create one instance of this class for each unique test
+ * database they want to use. When the tests needing this instance are complete,
+ * ensure that {@link #drop(InMemoryDatabase)} is called to free the resources so
+ * the JVM running the unit tests doesn't run out of heap space.
+ */
+public class InMemoryDatabase implements SchemaFactory<ReviewDb> {
+  private static int dbCnt;
+
+  private static synchronized DataSource newDataSource() throws SQLException {
+    final Properties p = new Properties();
+    p.setProperty("driver", org.h2.Driver.class.getName());
+    p.setProperty("url", "jdbc:h2:mem:" + "Test_" + (++dbCnt));
+    final DataSource dataSource = new SimpleDataSource(p);
+    return dataSource;
+  }
+
+  /** Drop the database from memory; does nothing if the instance was null. */
+  public static void drop(final InMemoryDatabase db) {
+    if (db != null) {
+      db.drop();
+    }
+  }
+
+  private Connection openHandle;
+  private Database<ReviewDb> database;
+  private boolean created;
+  private SchemaVersion schemaVersion;
+
+  public InMemoryDatabase() throws OrmException {
+    try {
+      final DataSource dataSource = newDataSource();
+
+      // Open one connection. This will peg the database into memory
+      // until someone calls drop on us, allowing subsequent connections
+      // opened against the same URL to go to the same set of tables.
+      //
+      openHandle = dataSource.getConnection();
+
+      // Build the access layer around the connection factory.
+      //
+      database = new Database<ReviewDb>(dataSource, ReviewDb.class);
+
+      schemaVersion =
+          Guice.createInjector(new SchemaVersion.Module()).getBinding(
+              Key.get(SchemaVersion.class, Current.class)).getProvider().get();
+    } catch (SQLException e) {
+      throw new OrmException(e);
+    }
+  }
+
+  public Database<ReviewDb> getDatabase() {
+    return database;
+  }
+
+  @Override
+  public ReviewDb open() throws OrmException {
+    return getDatabase().open();
+  }
+
+  /** Ensure the database schema has been created and initialized. */
+  public InMemoryDatabase create() throws OrmException {
+    if (!created) {
+      created = true;
+      final ReviewDb c = open();
+      try {
+        new SchemaCreator(new File("."), schemaVersion).create(c);
+      } finally {
+        c.close();
+      }
+    }
+    return this;
+  }
+
+  /** Drop this database from memory so it no longer exists. */
+  public void drop() {
+    if (openHandle != null) {
+      try {
+        openHandle.close();
+      } catch (SQLException e) {
+        System.err.println("WARNING: Cannot close database connection");
+        e.printStackTrace(System.err);
+      }
+      openHandle = null;
+      database = null;
+    }
+  }
+
+  public SystemConfig getSystemConfig() {
+    return new SystemConfigProvider(this, new Provider<SchemaVersion>() {
+      public SchemaVersion get() {
+        return schemaVersion;
+      }
+    }).get();
+  }
+
+  public CurrentSchemaVersion getSchemaVersion() throws OrmException {
+    final ReviewDb c = open();
+    try {
+      return c.schemaVersion().get(new CurrentSchemaVersion.Key());
+    } finally {
+      c.close();
+    }
+  }
+
+  public void assertSchemaVersion() throws OrmException {
+    final CurrentSchemaVersion act = getSchemaVersion();
+    TestCase.assertEquals(schemaVersion.getVersionNbr(), act.versionNbr);
+  }
+}