Fix failing test

Author: mroeschke

pandas/core/indexes/datetimes.py

@@ -311,7 +311,7 @@ def _add_comparison_methods(cls):
     _bool_ops = ['is_month_start', 'is_month_end',
                  'is_quarter_start', 'is_quarter_end', 'is_year_start',
                  'is_year_end', 'is_leap_year']
-    _object_ops = ['weekday_name', 'day_name', 'freq', 'tz']
+    _object_ops = ['weekday_name', 'freq', 'tz']
     _field_ops = ['year', 'month', 'day', 'hour', 'minute', 'second',
                   'weekofyear', 'week', 'weekday', 'dayofweek',
                   'dayofyear', 'quarter', 'days_in_month',
@@ -1720,7 +1720,7 @@ def freq(self, value):
 
     weekday_name = _field_accessor(
         'weekday_name',
-        'day_name',
+        'weekday_name',
         "The name of day in a week (ex: Friday)\n\n.. deprecated:: 0.23.0")
 
     dayofyear = _field_accessor('dayofyear', 'doy',