TST: add test for fix of #12405

Author: tsdlovell

pandas/tests/plotting/test_datetimelike.py

@@ -4,7 +4,7 @@
 from pandas.compat import lrange, zip
 
 import numpy as np
-from pandas import Index, Series, DataFrame
+from pandas import Index, Series, DataFrame, NaT
 
 from pandas.tseries.index import date_range, bdate_range
 from pandas.tseries.offsets import DateOffset
@@ -813,6 +813,23 @@ def test_mixed_freq_shared_ax(self):
         # self.assertEqual(ax1.lines[0].get_xydata()[0, 0],
         #                  ax2.lines[0].get_xydata()[0, 0])
 
+    def test_nat_handling(self):
+
+        import matplotlib.pyplot as plt
+
+        fig = plt.gcf()
+        plt.clf()
+        ax = fig.add_subplot(111)
+
+        dti = DatetimeIndex(['2015-01-01', NaT, '2015-01-03'])
+        s = Series(range(len(dti)), dti)
+        s.plot(ax=ax)
+        xdata = ax.get_lines()[0].get_xdata()
+        # plot x data is bounded by index values
+        self.assertLessEqual(s.index.min(), Series(xdata).min())
+        self.assertLessEqual(Series(xdata).max(), s.index.max())
+        _check_plot_works(s.plot)
+
     @slow
     def test_to_weekly_resampling(self):
         idxh = date_range('1/1/1999', periods=52, freq='W')