src/sys/component_manager/tests/collections/meta/trigger_realm.cml

// Integration test realm that hosts a trigger component.
{
    // Expose Trigger service from child.
    "expose": [
        {
            "protocol": "/svc/fidl.test.components.Trigger",
            "from": "#trigger",
        },
    ],
    // Route Echo service to child.
    "offer": [
        // Offer the ELF runner to children.
        {
            "runner": "elf",
            "from": "realm",
            "to": [
                "#trigger",
            ]
        },
        {
            "protocol": [
                "/svc/fuchsia.logger.LogSink",
                "/svc/fidl.examples.routing.echo.Echo",
            ],
            "from": "realm",
            "to": [ "#trigger" ]
        },
    ],
    "children": [
        {
            "name": "trigger",
            "url": "fuchsia-pkg://fuchsia.com/collections_integration_test#meta/trigger_a.cm",
        },
    ],
}