public void testMappingAnd_nanY2() {
    assertThrows(
        IllegalArgumentException.class,
        () -> LinearTransformation.mapping(1.2, 3.4).and(5.6, Double.NaN));
  }

  public void testMappingAnd_samePointTwice() {
    double x = 1.2;
    double y = 3.4;
    assertThrows(
        IllegalArgumentException.class,
        () -> {
          LinearTransformation.mapping(x, y).and(x, y);
        });
  }

  public void testMappingAnd_nanY2() {
    assertThrows(
        IllegalArgumentException.class,
        () -> LinearTransformation.mapping(1.2, 3.4).and(5.6, Double.NaN));
  }

  public void testMappingAnd_samePointTwice() {
    double x = 1.2;
    double y = 3.4;
    assertThrows(
        IllegalArgumentException.class,
        () -> {
          LinearTransformation.mapping(x, y).and(x, y);
        });
  }