@Test
public void effectiveMigration() {

    URL url = TestURLBuilder.forContent(script("input.foo = 'baz';")).build();
    DefaultDockerImageMigrationHandler migrationHandler = new DefaultDockerImageMigrationHandler(url);
    Node result = migrationHandler.performMigration(TEST_NODE);
    assertThat(result).isEqualTo(TEST_NODE.editNode().put("foo", "baz"));
}