Update test

Author: dsaxton

pandas/tests/series/test_missing.py

@@ -509,12 +509,12 @@ def test_fillna_nat(self):
         tm.assert_frame_equal(filled2, expected)
 
     def test_isna_for_inf(self):
-        s = Series(["a", np.inf, np.nan, 1.0])
+        s = Series(["a", np.inf, np.nan, pd.NA, 1.0])
         with pd.option_context("mode.use_inf_as_na", True):
             r = s.isna()
             dr = s.dropna()
-        e = Series([False, True, True, False])
-        de = Series(["a", 1.0], index=[0, 3])
+        e = Series([False, True, True, True, False])
+        de = Series(["a", 1.0], index=[0, 4])
         tm.assert_series_equal(r, e)
         tm.assert_series_equal(dr, de)