The Unit bundle can throw exception during the test, and most of them are related to a bad test writing. This documentation explains why the exceptions are thrown and how to fix it.
The CSRF Token manager is missing from the container. It means that it may not be installed at all (composer require symfony/security-csrf) or not enabled (in your configuration, check the configuration framework.csrf_protection: true). Check the Symfony's documentation for more information.
The entity manager cannot be found. This means doctrine is not installed or badly configured. Please check the Symfony's documentation.