@Override
      public void preprocessOsmNode(OsmElement.Node node) {
        if (node.hasTag("a", "b")) {
          nodes1.put(node.id(), node.id());
        }
      }
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