Hi - with the NavigableMap method of config access marked as deprecated - could anybody suggest the correct way to set a config value in a unit test / integration test method. I have test methods in a test class that require different config fixtures per method, so need a way to set the config differently for each method

This has been restored for Grails 7 and will be available. The latest discuss centered around keeping it but addressing the underlying reasons it was marked as deprecated. https://github.com/grails/grails-core/pull/13869