@Test
public void testDrawLine() {

  opencv_core.Mat src = LaneManager.readImage(getResourcePath(TEST_IMAGE));
  opencv_core.Scalar color = new opencv_core.Scalar(255, 0, 0, 0); // Blue (BGR)
  LaneManager.drawLine(src,
      new opencv_core.Point(0, 0), // top left
      new opencv_core.Point(src.size().width(), src.size().height()), // bottom right
      color, 5);
  assertTrue(LaneManager.writeImage("/tmp/robocar_line.jpg", src));
}