void createModelWithTesterNodes(String testerNodesXml) {
        String containerXml = "<container id='default' version='1.0'>%s</container>".formatted(testerNodesXml);
        VespaModelTester tester = new VespaModelTester();
        tester.setApplicationId("t", "a", "i-t");
        tester.addHosts(3);
        tester.createModel(containerXml, true);
    }
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