@Test
public void testExecContainer() throws Exception {

  Container container = mock(Container.class);
  LinuxContainerExecutor lce = mock(LinuxContainerExecutor.class);
  ContainerExecContext.Builder builder =
      new ContainerExecContext.Builder();
  builder.setUser("foo").setAppId("app1").setContainer(container);
  ContainerExecContext ctx = builder.build();
  lce.execContainer(ctx);
  verify(lce, times(1)).execContainer(ctx);
}