@Test
    void processingHandler_is_instantiated_from_the_default_bundle() {
        createClusterWithProcessingAndSearchChains();
        ComponentsConfig.Components config = getComponentInConfig(componentsConfig(), PROCESSING_HANDLER_CLASS);
        assertEquals(PROCESSING_HANDLER_CLASS, config.bundle());
    }
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