@Test
public void testHtmlMatrixTracerWithAsciiFallback() throws IOException {

    Matrix mtx1 = makeRandomMatrix(100, 100);
    // Custom color mapping.
    Tracer.showHtml(mtx1, COLOR_MAPPER, true);
    Matrix mtx2 = new DenseMatrix(100, 100);
    double MAX = (double)(mtx2.rowSize() * mtx2.columnSize());
    mtx2.assign((x, y) -> (double)(x * y) / MAX);
    Tracer.showHtml(mtx2, true);
}