@Test public void testValidate() {
try {
AVector[] vecs = { Vectorz.createZeroVector(6), Vector.of(1,2,3), Vectorz.createZeroVector(6) };
SparseColumnMatrix M = SparseColumnMatrix.create(vecs);
M.validate();
fail("Expected a VectorzException to be thrown");
} catch (VectorzException E) {
// assertThat(E.getMessage(), is("Invalid column count at row: 1"));
// assertThat(E.getMessage(), is("Wrong length data line vector, length 3 at position: 1"));
}