@Test
public void prependStringWithIndent() {

    List<DenseVector> denseVectors = new ArrayList<>();
    for (int i = 0; i < 10; i += 1) {
        denseVectors.add(new DenseVector(generateRandomDoubleArray(10)));
    }
    String content = displayList(denseVectors, true);
    content = PrettyDisplayUtils.prependStringWithIndent(content, "centers: ");
    System.out.println(content);
}