function seePostCssPluginFor(file, pluginName) {
        const loader = assert()
            .rule(config, rule => String(rule.test).includes(file))
            .loader(/postcss-loader/)
            .get();

        /** @type {import('postcss').AcceptedPlugin[]} */
        const plugins =
            (loader &&
                loader.options &&
                loader.options.postcssOptions &&
                loader.options.postcssOptions.plugins) ||
            [];

        // @ts-ignore
        t.true(plugins.some(plugin => plugin.postcssPlugin === pluginName));
    }
@param {string} file
@param {string} pluginName