How to use the kmapper.visuals.build_histogram function in kmapper

def test_color_hist_matches_nodes(self):
        """ The histogram colors dont seem to match the node colors, this should confirm the colors will match and we need to look at the javascript instead.
        """

        color_function = np.array([0.55] * 10 + [0.0] * 10)
        member_ids = [1, 2, 3, 4, 5, 6]
        hist = build_histogram(color_function[member_ids])
        c = round(_color_function(member_ids, color_function), 2)
        single_bar = [bar for bar in hist if bar["perc"] == 100.0]

        assert len(single_bar) == 1
        assert _map_val2color(c, 0.0, 1.0) == single_bar[0]["color"]

def test_histogram(self):
        data = np.random.random((100, 1))
        hist = visuals.build_histogram(data)
        assert isinstance(hist, list)
        assert isinstance(hist[0], dict)
        assert len(hist) == 10