@Test
public void returnsCoords() {

    final int lines = 3;
    final int cols = 4;
    final Iterable<Scalar<Object>> scalars = new Scalars<>(lines * cols);
    final FixedMatrix<Object> matrix = new FixedMatrix<>(lines, cols, scalars);
    MatcherAssert.assertThat(
        Arrays.asList(matrix.coords()), Matchers.equalTo(Lists.newArrayList(scalars))
    );
}