@After
  public void teardownInMemoryDB() throws AmbariException, SQLException {
    if (injector != null) {
      H2DatabaseCleaner.clearDatabaseAndStopPersistenceService(injector);
    }
  }
Closes the JPA connection after executing the test suite.
ambari-server/src/test/java/org/apache/ambari/server/controller/internal/UserResourceProviderDBTest.java