@Test
public void testCrossSectionSigma() {

    Product product = new Product("dummy", "dummy");
    Band b1 = createBand("radiance_1", 1);
    Band b2 = createBand("radiance_2", 2);
    Band b3 = createBand("radiance_3", 3);
    Band b4 = createBand("radiance_4", 4);
    product.addBand(b1);
    product.addBand(b2);
    product.addBand(b3);
    product.addBand(b4);
    double[] allWavelengths = algo.getCrossSectionSigma(product, 3, "radiance_%d");
    assertArrayEquals(new double[]{1.0041580107718594E-9, 3.915403961025194E-12, 1.5231224042681756E-13}, allWavelengths, 1e-8);
}