add test to ensure symbol column of peak annotation is not empty

workflow/tests/test_annotate_peaks.py

@@ -25,6 +25,8 @@ def test_annotation_singleend():
     annotation_file = test_output_path + 'ENCSR238SGC.chipseeker_annotation.tsv'
     assert os.path.exists(annotation_file)
     assert utils.count_lines(annotation_file) >= 149284
+    df = pd.read_csv(annotation_file, sep = "\t")
+    assert df['symbol'].notna().all()
 
 
 @pytest.mark.pairedend
@@ -42,3 +44,5 @@ def test_annotation_pairedend():
     annotation_file = test_output_path + 'ENCSR729LGA.chipseeker_annotation.tsv'
     assert os.path.exists(annotation_file)
     assert utils.count_lines(annotation_file) >= 25367
+    df = pd.read_csv(annotation_file, sep = "\t")
+    assert df['symbol'].notna().all()