@Override
    public Map<String, List<VectorTile.Feature>> postProcessTileFeatures(TileCoord tileCoord,
      Map<String, List<VectorTile.Feature>> layers) throws GeometryException {
      return postprocessTileFeatures == null ? null : postprocessTileFeatures.process(tileCoord, layers);
    }
In-memory tests with fake data and profiles to ensure all features work end-to-end.
planetiler-core/src/test/java/com/onthegomap/planetiler/PlanetilerTests.java