ignore runtimewarning in plotting tests

Author: mroeschke

pandas/tests/io/test_sql.py

@@ -2226,7 +2226,7 @@ def test_api_chunksize_read(conn, request):
 
     # reading the query in chunks with read_sql_query
     if conn_name == "sqlite_buildin":
-        with pytest.raises(NotImplementedError, match=""):
+        with pytest.raises(NotImplementedError, match="^$"):
             sql.read_sql_table("test_chunksize", conn, chunksize=5)
     else:
         res3 = DataFrame()

pandas/tests/plotting/frame/test_frame.py

@@ -52,6 +52,10 @@
 mpl = pytest.importorskip("matplotlib")
 plt = pytest.importorskip("matplotlib.pyplot")
 
+pytestmark = pytest.mark.filterwarnings(
+    "ignore:divide by zero encountered in scalar divide:RuntimeWarning"
+)
+
 
 class TestDataFramePlots:
     @pytest.mark.slow

pandas/tests/plotting/test_series.py

@@ -40,6 +40,10 @@
 from pandas.plotting._matplotlib.converter import DatetimeConverter
 from pandas.plotting._matplotlib.style import get_standard_colors
 
+pytestmark = pytest.mark.filterwarnings(
+    "ignore:divide by zero encountered in scalar divide:RuntimeWarning"
+)
+
 
 @pytest.fixture
 def ts():