TST: show deprecation config options as FutureWarnings

Author: jreback

doc/source/whatsnew/v0.23.0.txt

@@ -207,6 +207,7 @@ Other API Changes
 - :func:`wide_to_long` previously kept numeric-like suffixes as ``object`` dtype. Now they are cast to numeric if possible (:issue:`17627`)
 - In :func:`read_excel`, the ``comment`` argument is now exposed as a named parameter (:issue:`18735`)
 - Rearranged the order of keyword arguments in :func:`read_excel()` to align with :func:`read_csv()` (:issue:`16672`)
+- The options ``html.border`` and ``mode.use_inf_as_null`` were deprecated in prior versions, these will now show ``FutureWarning`` rather than a ``DeprecationWarning`` (:issue:`19003`)
 
 .. _whatsnew_0230.deprecations:
 

pandas/core/config.py

@@ -613,7 +613,7 @@ def _warn_if_deprecated(key):
     if d:
         if d.msg:
             print(d.msg)
-            warnings.warn(d.msg, DeprecationWarning)
+            warnings.warn(d.msg, FutureWarning)
         else:
             msg = "'{key}' is deprecated".format(key=key)
             if d.removal_ver:
@@ -624,7 +624,7 @@ def _warn_if_deprecated(key):
             else:
                 msg += ', please refrain from using it.'
 
-            warnings.warn(msg, DeprecationWarning)
+            warnings.warn(msg, FutureWarning)
         return True
     return False
 

pandas/tests/groupby/test_nth.py

@@ -175,7 +175,7 @@ def test_nth(self):
         df = DataFrame([[1, np.nan], [1, 4], [5, 6]], columns=['A', 'B'])
         g = df.groupby('A')
         # PR 17493, related to issue 11038
-        # test Series.nth with True for dropna produces DeprecationWarning
+        # test Series.nth with True for dropna produces FutureWarning
         with assert_produces_warning(FutureWarning):
             result = g.B.nth(0, dropna=True)
         expected = g.B.first()

pandas/tests/io/formats/test_to_html.py

@@ -1411,8 +1411,9 @@ def test_to_html_border_zero(self):
         result = df.to_html(border=0)
         assert 'border="0"' in result
 
+    @tm.capture_stdout
     def test_display_option_warning(self):
-        with tm.assert_produces_warning(DeprecationWarning,
+        with tm.assert_produces_warning(FutureWarning,
                                         check_stacklevel=False):
             pd.options.html.border
 

pandas/tests/series/test_missing.py

@@ -480,12 +480,9 @@ def test_isna_for_inf(self):
     def test_isnull_for_inf_deprecated(self):
         # gh-17115
         s = Series(['a', np.inf, np.nan, 1.0])
-        with tm.assert_produces_warning(DeprecationWarning,
-                                        check_stacklevel=False):
-            pd.set_option('mode.use_inf_as_null', True)
+        with pd.option_context('mode.use_inf_as_null', True):
             r = s.isna()
             dr = s.dropna()
-            pd.reset_option('mode.use_inf_as_null')
 
         e = Series([False, True, True, False])
         de = Series(['a', 1.0], index=[0, 3])