import numpy as np
from matplotlib import markers

import pytest


def test_markers_valid():
    marker_style = markers.MarkerStyle()
    mrk_array = np.array([[-0.5, 0],
                          [0.5, 0]])
    # Checking this doesn't fail.
    marker_style.set_marker(mrk_array)


def test_markers_invalid():
    marker_style = markers.MarkerStyle()
    mrk_array = np.array([[-0.5, 0, 1, 2, 3]])
    # Checking this does fail.
    with pytest.raises(ValueError):
        marker_style.set_marker(mrk_array)