public Properties getProperties() {
    return properties;
  }
Gets the properties that will be used to initialize the system. If a
property is placed here which {@link #configure()} also sets, then
{@link #configure()} will not set it, and instead take the property that
the test has set.

@return
ambari-server/src/test/java/org/apache/ambari/server/orm/InMemoryDefaultTestModule.java