TST: add test for fix of pandas-dev#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
@@ -778,6 +778,28 @@ def test_mixed_freq_irreg_period(self):
         irreg.plot()
         ps.plot()
 
+    def test_nat_handling(self):
+
+        import matplotlib.pyplot as plt
+
+        def inject_nat_into_index_col(df):
+            df.loc[len(df)//2, 'index'] = NaT
+            return df
+
+        fig = plt.gcf()
+        plt.clf()
+        ax = plt.gca()
+
+        s = (tm.makeTimeSeries()
+             .reset_index()
+             .pipe(inject_nat_into_index_col)
+             .set_index('index', drop=True))
+        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())
+
     @slow
     def test_to_weekly_resampling(self):
         idxh = date_range('1/1/1999', periods=52, freq='W')