  @Test
  public void build() {

    assertNull(RELATION_BUILDER.build(RELATION_0));
    assertNull(RELATION_BUILDER.build(RELATION_1));
    assertTrue(RELATION_BUILDER.build(RELATION_2) instanceof Polygon);
    assertTrue(RELATION_BUILDER.build(RELATION_3) instanceof MultiPolygon);
    assertTrue(RELATION_BUILDER.build(RELATION_4) instanceof MultiPolygon);
  }