@Test
public void testClose() throws Exception {

	// Docker client is not null
	Mockito.verifyZeroInteractions( this.dockerClient );
	this.configurator.close();
	Mockito.verify( this.dockerClient, Mockito.times( 1 )).close();
	// When it is null
	Mockito.reset( this.dockerClient );
	this.configurator.dockerClient = null;
	this.configurator.close();
	Mockito.verifyNoMoreInteractions( this.dockerClient );
}