Test Plugin with MarkdowRenderChild in CodeBlock

main.ts

import { MarkdownRenderChild, Plugin } from 'obsidian';

export default class Test extends Plugin {
    async onload() {
        console.log('loading plugin "test"');

        this.registerMarkdownCodeBlockProcessor('testlang', async (_src, el, ctx) => {
            ctx.addChild(new TestRenderChild(el));

        });
    }

    onunload() {
        console.log('unloading plugin "test"');
    }
}

class TestRenderChild extends MarkdownRenderChild {
    private readonly container: HTMLElement;

    constructor(element: HTMLElement) {
        super();
        this.container = element;
    }

    onload() {
        console.log('load test');
        const div = this.container.createEl('div');
        div.innerHTML = 'test';
    }

    onunload() {
        console.log('unload test');
    }
}