Description

Here is one use case for the feature that was postponed in #53059. Opening as a new issue so it does not get lost in the already-closed issue. We can close this one here once #53059 is re-opened.

The use case is that it may be necessary to work with different sets of routes during functional tests. The Router keeps the routes in a private static $cache property, which makes it impossible to change the routes once one set has been loaded.

Setting $cache_dir to null disables the part of the code where routes are dumped to a cache file and the results of that file are loaded into the ::$cache property.

Example

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