@Test
  public void checkImagesAreFoundCorrectly() {

    Assert.assertNull(DockerUtils.findImageByIdOrByTag("oops81:unknown", this.docker));
    Assert.assertNotNull(DockerUtils.findImageByIdOrByTag("ubuntu", this.docker));
    Assert.assertNotNull(DockerUtils.findImageByIdOrByTag("ubuntu:latest", this.docker));
  }
  @Test
  public void testDockerUtils_onLimits() {
    DockerUtils.deleteImageIfItExists(null, this.docker);
    Assert.assertTrue("No exception is thrown trying to delete a null image ID.", true);

    DockerUtils.deleteImageIfItExists("bla 11 4 2 bla", this.docker);
    Assert.assertTrue(
        "No exception is thrown trying to delete something that does not exist.", true);

    Container container = DockerUtils.findContainerByIdOrByName("bla 11 4 2 bla", this.docker);
    Assert.assertNull(container);

    Image image = DockerUtils.findImageByIdOrByTag(null, this.docker);
    Assert.assertNull(image);

    image = DockerUtils.findImageByIdOrByTag("invalid", this.docker);
    Assert.assertNull(image);
  }
  @Test(expected = TargetException.class)
  public void testConfigureVM_invalidBaseImage() throws Exception {

    Assume.assumeTrue(this.dockerIsInstalled);
    Map<String, String> targetProperties = loadTargetProperties();
    targetProperties.put(DockerHandler.IMAGE_ID, "will-not-be-generated");
    targetProperties.put(DockerHandler.BASE_IMAGE, "oops81:unknown");

    DockerMachineConfigurator configurator =
        new DockerMachineConfigurator(
            targetProperties, this.msgCfg, "656sdf6sd", "/test", "app", new Instance());

    try {
      configurator.dockerClient = this.docker;
      configurator.createImage("will-not-be-generated");

    } finally {
      configurator.dockerClient = null;
      configurator.close();
      Assert.assertNull(DockerUtils.findImageByIdOrByTag("will-not-be-generated", this.docker));
    }
  }