revert test_datetimelike

Author: MarcoGorelli

pandas/tests/plotting/test_datetimelike.py

@@ -219,7 +219,7 @@ def test_line_plot_period_mlt_frame(self, frqncy):
         _check_plot_works(df.plot, freq)
 
     @pytest.mark.slow
-    def test_line_plot_float_frame_dt_index(self):
+    def test_line_plot_datetime_frame(self):
         for df in self.datetime_df:
             freq = df.index.to_period(df.index.freq.rule_code).freq
             _check_plot_works(df.plot, freq)