@Test
public void testUpdateYarnSysFS() throws Exception {

  String user = System.getProperty("user.name");
  String appId="app-1";
  String spec="";
  Context ctx = mock(Context.class);
  LinuxContainerExecutor lce = mock(LinuxContainerExecutor.class);
  lce.updateYarnSysFS(ctx, user, appId, spec);
  verify(lce, times(1)).updateYarnSysFS(ctx, user, appId, spec);
}