def test_invalid_scalar_index(adata, index):
    # https://github.com/theislab/anndata/issues/619
    with pytest.raises(IndexError, match=r".*index.* out of range\."):
        _ = adata[index]
def open_link(self):
        "Open the selected item with the webbrowser"

        data = self.get_selected_item()
        url = data.get('permalink')
        if url:
            self.term.open_browser(url)
        else:
            self.term.flash()