@Test
  void testRectangleWithSlantedEdgeIsNotFill() {
    assertIsFillOrEdge(false, false, newPolygon(
      1, -1,
      257, -1,
      257, 257,
      2, 257,
      1, -1
    ));
  }
This class is copied from
https://github.com/ElectronicChartCentre/java-vector-tile/blob/master/src/test/java/no/ecc/vectortile/VectorTileEncoderTest.java
and modified based on the changes in VectorTileEncoder, and adapted to junit 5.
planetiler-core/src/test/java/com/onthegomap/planetiler/VectorTileTest.java