assert called once is a function these days

tests/unit/test_cli.py

@@ -25,31 +25,31 @@ def test_dug_cli_parser():
 @patch('dug.cli.crawl')
 def test_dug_cli_main_crawl(mock_crawl):
     main(["crawl", "somefile.csv", "--parser", "topmedtag"])
-    assert mock_crawl.called_once()
+    mock_crawl.assert_called_once()
 
 @mark.cli
 @patch('dug.cli.crawl')
 def test_dug_cli_main_extract_dug_elements(mock_crawl):
     main(["crawl", "somefile.csv", "--parser", "topmedtag", "-x"])
-    assert mock_crawl.called_once()
+    mock_crawl.assert_called_once()
     assert mock_crawl.call_args_list[0].args[0].extract_dug_elements
 
 @mark.cli
 @patch('dug.cli.crawl')
 def test_dug_cli_main_extract_dug_elements_none(mock_crawl):
     main(["crawl", "somefile.csv", "--parser", "topmedtag"])
-    assert mock_crawl.called_once()
+    mock_crawl.assert_called_once()
     assert not mock_crawl.call_args_list[0].args[0].extract_dug_elements
 
 @mark.cli
 @patch('dug.cli.crawl')
 def test_dug_cli_main_annotator(mock_crawl):
     main(["crawl", "somefile.csv","--parser", "topmedtag", "--annotator", "annotator-monarch"])
-    assert mock_crawl.called_once()
+    mock_crawl.assert_called_once()
 
 @mark.cli
 @patch('dug.cli.search')
 def test_dug_cli_main_search(mock_search):
     # mock_search.search.return_value = "Searching!"
     main(["search", "-q", "heart attack", "-t", "variables", "-k", "namespace=default"])
-    assert mock_search.called_once()
+    mock_search.assert_called_once()