While preparing for T367574: [Epic] Remove code for Special:EditGrowthConfig, I noticed the coverage for AbstractDataConfigurationLoader, ConfigurationLoaderTrait and ConfigurationValidator to be exclusively coming from PageConfigurationLoaderTest, which was written for legacy Community Configuration. This means that once we remove CC1.0, the coverage for those files drops to 0%, which is not desired.
Prior to dropping legacy CC code, the CC2.0 equivalent should receive appropriate test coverage.