@Test
public void getPixelValueTest() throws IOException, URISyntaxException {

    String testFilePath = getTestFilePath(TESTFILENAME);
    Product sourceProduct = ProductIO.readProduct(testFilePath);
    RasterDataNode rasterDataNode = sourceProduct.getRasterDataNode("Oa11_radiance");
    Rectangle expectedRect = new Rectangle(0, 0, 20, 20);
    MultiLevelImage image = rasterDataNode.getSourceImage();
    Raster raster = image.getData(expectedRect);
    TileImpl sourceTile = new TileImpl(rasterDataNode, raster);
    Double testValue = PpeOp.getPixelValue(sourceTile, 0, 21);
    assertEquals(0, testValue, 1e-5);
    Double testValue2 = PpeOp.getPixelValue(sourceTile, 3, image.getMaxY() + 1);
    assertEquals(0, testValue2, 1e-5);
    Double testValue3 = PpeOp.getPixelValue(sourceTile, 8, -1);
    assertEquals(0, testValue3, 1e-5);
    Double testValue4 = PpeOp.getPixelValue(sourceTile, 1, 1);
    assertEquals(10.36252, testValue4, 1e-5);
    Double testValue5 = PpeOp.getPixelValue(sourceTile, 10, 10);
    assertEquals(10.47061, testValue5, 1e-5);
}