def METHOD_NAME():
    plt.figure()
    im_signed = np.array([[-0.5, -0.2], [0.1, 0.4]])
    with expected_warnings(imshow_expected_warnings +
                           [r"CObject type is marked|\A\Z"]):
        ax_im = io.imshow(im_signed)
    assert ax_im.get_clim() == (-0.5, 0.5)
    assert n_subplots(ax_im) == 2
    assert ax_im.colorbar is not None