@Test
    void http_server_port_is_configurable_and_does_not_affect_other_ports() {
        Element clusterElem = DomBuilderTest.parse(
                "<container version='1.0'>",
                "  <http>",
                "    <server port='9000' id='foo' />",
                "  </http>",
                nodesXml,
                "</container>");
        createModel(root, clusterElem);
        AbstractService container = (AbstractService) root.getProducer("container/container.0");
        assertEquals(9000, container.getRelativePort(0));
        assertNotEquals(9001, container.getRelativePort(1));
    }
Tests for "core functionality" of the container model, e.g. ports, or the 'components' and 'bundles' configs.

Before adding a new test to this class, check if the test fits into one of the other existing subclasses
of {@link ContainerModelBuilderTestBase}. If not, consider creating a new subclass.

@author gjoranv
config-model/src/test/java/com/yahoo/vespa/model/container/xml/ContainerModelBuilderTest.java