Here is how the published bundles look like at "buildTarget()" method:
<pre><code>array(
...
[jquery] => yii\web\AssetBundle Object
        (
            [sourcePath] => /home/www/html/yii2/yii/assets
            [basePath] => /home/www/html/yii2/tests/unit/runtime/AssetControllerTest/assets/97c6dae
            [baseUrl] => /97c6dae
            [depends] => Array
                (
                )

            [js] => Array
                (
                    [0] => /97c6dae/jquery.min.js
                )

            [css] => Array
                (
                )

            [jsOptions] => Array
                (
                )

            [cssOptions] => Array
                (
                )

            [publishOptions] => Array
                (
                )
        )
)</code></pre>