Fix failing tests

Author: shoyer

xarray/test/test_dataarray.py

@@ -516,7 +516,7 @@ def test_sel_method(self):
             actual = data.sel(x=[0.9, 1.9], method='backfill', tolerance=1)
             self.assertDataArrayIdentical(expected, actual)
         else:
-            with self.assertRaisesRegexp(NotImplementedError, 'tolerance'):
+            with self.assertRaisesRegexp(TypeError, 'tolerance'):
                 data.sel(x=[0.9, 1.9], method='backfill', tolerance=1)
 
     def test_isel_points(self):

xarray/test/test_dataset.py

@@ -1085,7 +1085,7 @@ def test_reindex_method(self):
             expected = Dataset({'x': ('y', 3 * [np.nan]), 'y': y})
             self.assertDatasetIdentical(expected, actual)
         else:
-            with self.assertRaisesRegexp(NotImplementedError, 'tolerance'):
+            with self.assertRaisesRegexp(TypeError, 'tolerance'):
                 ds.reindex(y=y, method='backfill', tolerance=0.1)
 
         actual = ds.reindex(y=y, method='pad')