tests: fix pandas warnings

environment.yml

@@ -28,6 +28,7 @@ dependencies:
 - matplotlib         # gui
 - numpy              # pandas, keras, contrib.tenumerate
 - pandas
+- pyarrow            # pandas
 - tensorflow         # keras
 - slack-sdk          # contrib.slack
 - requests           # contrib.telegram

tests/tests_pandas.py

@@ -115,6 +115,8 @@ def test_pandas_data_frame():
                     f"\nExpected:\n{exres} at least once.\nIn:\n{our_file.read()}\n")
 
 
+@mark.filterwarnings(
+    "ignore:DataFrameGroupBy.apply operated on the grouping columns:DeprecationWarning")
 def test_pandas_groupby_apply():
     """Test pandas.DataFrame.groupby(...).progress_apply"""
     with closing(StringIO()) as our_file:
@@ -167,6 +169,8 @@ def test_pandas_groupby_apply():
                     f"\nExpected:\n{exres} at least once.\nIn:\n{our_file.read()}\n")
 
 
+@mark.filterwarnings(
+    "ignore:DataFrameGroupBy.apply operated on the grouping columns:DeprecationWarning")
 def test_pandas_leave():
     """Test pandas with `leave=True`"""
     with closing(StringIO()) as our_file:
@@ -201,6 +205,8 @@ def test_pandas_apply_args_deprecation():
             "keyword arguments instead"))
 
 
+@mark.filterwarnings(
+    "ignore:DataFrameGroupBy.apply operated on the grouping columns:DeprecationWarning")
 def test_pandas_deprecation():
     """Test bar object instance as argument deprecation"""
     try: