code: @Nullable
    private Config buildPackageConfig(String packageName) {
      return Config.Implementation.fromProperties(getConfigProperties(packageName));
    }
docs: Generate {@link Config} for the specified package.
  
  More specific packages, test classes, and test method configurations
  will override values provided here.
  
  The default implementation uses properties provided by {@link #getConfigProperties(String)}.
  
  The returned object is likely to be reused for many tests.
  
  @param packageName the name of the package, or empty string ({@code ""}) for the top level package
  @return {@link Config} object for the specified package
  @since 3.2