### Question:
CGroupsCpuResourceHandlerImpl implements CpuResourceHandler { @Override public List<PrivilegedOperation> teardown() throws ResourceHandlerException { return null; } CGroupsCpuResourceHandlerImpl(CGroupsHandler cGroupsHandler); @Override List<PrivilegedOperation> bootstrap(Configuration conf); @InterfaceAudience.Private static boolean cpuLimitsExist(String path); @VisibleForTesting @InterfaceAudience.Private static int[] getOverallLimits(float yarnProcessors); @Override List<PrivilegedOperation> preStart(Container container); @Override List<PrivilegedOperation> reacquireContainer(ContainerId containerId); @Override List<PrivilegedOperation> updateContainer(Container container); @Override List<PrivilegedOperation> postComplete(ContainerId containerId); @Override List<PrivilegedOperation> teardown(); @Override String toString();  }### Answer:
@Test public void testTeardown() throws Exception { Assert.assertNull(cGroupsCpuResourceHandler.teardown()); }
@Test public void testStrictResourceUsage() throws Exception { Assert.assertNull(cGroupsCpuResourceHandler.teardown()); }