src/hic_TAD_caller/create_TAD_HiC_files/calling_tads.py: fix test of add_cell_column function

src/hic_TAD_caller/create_TAD_HiC_files/calling_tads.py

@@ -48,7 +48,8 @@ def add_cell_column(exp_table: pd.DataFrame) -> pd.DataFrame:
     :return: The exp_table with a column cell.
 
     >>> d = read_hic_url_content()
-    >>> add_cell_column(d)["cell"].to_list()
+    >>> add_cell_column(d)["cell"].to_list()[0:5]
+    ['K652', 'K652', 'HeLa', 'HeLa', 'HeLa']
     """
     cell_list = []
     cell_selected = ["K562", "HepG2", "HeLa"]