Revert "Add a regression test for #709"

This reverts commit b2b84e2.

Author: tkanmae

xray/test/test_backends.py

@@ -384,6 +384,14 @@ def test_encoding_kwarg(self):
             with self.roundtrip(ds, save_kwargs=kwargs) as actual:
                 pass
 
+        ds = Dataset({'t': pd.date_range('2000-01-01', periods=3)})
+        units = 'days since 1900-01-01'
+        kwargs = dict(encoding={'t': {'units': units}})
+        with self.roundtrip(ds, save_kwargs=kwargs) as actual:
+            self.assertEqual(actual.t.encoding['units'], units)
+            self.assertDatasetIdentical(actual, ds)
+
+
 _counter = itertools.count()
 
 
@@ -504,13 +512,6 @@ def test_open_encodings(self):
                                        if k in expected['time'].encoding)
                 self.assertDictEqual(actual_encoding, expected['time'].encoding)
 
-    def test_dump_encodings(self):
-        # regression test for #709
-        ds = Dataset({'x': ('y', np.arange(10.0))})
-        kwargs = dict(encoding={'x': {'zlib': True}})
-        with self.roundtrip(ds, save_kwargs=kwargs) as actual:
-            self.assertTrue(actual.x.encoding['zlib'])
-
     def test_dump_and_open_encodings(self):
         # Create a netCDF file with explicit time units
         # and make sure it makes it into the encodings