public boolean fence(HAServiceTarget fromSvc) {
    return fence(fromSvc, null);
  }
@Test
  public void testMultipleFencers() throws BadFencingConfigurationException {
    NodeFencer fencer = setupFencer(
        AlwaysSucceedFencer.class.getName() + "(foo)\n" +
        AlwaysSucceedFencer.class.getName() + "(bar)\n");
    assertTrue(fencer.fence(MOCK_TARGET));
    // Only one call, since the first fencer succeeds
    assertEquals(1, AlwaysSucceedFencer.fenceCalled);
    assertEquals("foo", AlwaysSucceedFencer.callArgs.get(0));
  }